From 8ac4c45653618559d7d5e814f5925d3ae5fc73a5 Mon Sep 17 00:00:00 2001
From: Shirofune-Security
 <43838376+Shirofune-Security@users.noreply.github.com>
Date: Mon, 21 Sep 2026 22:22:21 +0900
Subject: [PATCH 1/5] Add fixed native AppLocker Script probe and disposable
 evidence matrix

---
 .github/workflows/applocker-script-probe.yml |  46 +++++
 WELA.ps1                                     |  13 ++
 scripts/AppLockerScriptNative.cs             |  79 +++++++
 scripts/AppLockerScriptProbe.ps1             | 206 +++++++++++++++++++
 scripts/AppLockerScriptWorker.ps1            |   7 +
 tests/AppLockerScriptProbe.Cli.Tests.ps1     |  25 +++
 tests/AppLockerScriptProbe.Tests.ps1         |  67 ++++++
 tests/AppLockerScriptProbe.Windows.Tests.ps1 | 134 ++++++++++++
 8 files changed, 577 insertions(+)
 create mode 100644 .github/workflows/applocker-script-probe.yml
 create mode 100644 scripts/AppLockerScriptNative.cs
 create mode 100644 scripts/AppLockerScriptProbe.ps1
 create mode 100644 scripts/AppLockerScriptWorker.ps1
 create mode 100644 tests/AppLockerScriptProbe.Cli.Tests.ps1
 create mode 100644 tests/AppLockerScriptProbe.Tests.ps1
 create mode 100644 tests/AppLockerScriptProbe.Windows.Tests.ps1

diff --git a/.github/workflows/applocker-script-probe.yml b/.github/workflows/applocker-script-probe.yml
new file mode 100644
index 00000000..87a8a1a3
--- /dev/null
+++ b/.github/workflows/applocker-script-probe.yml
@@ -0,0 +1,46 @@
+name: Native AppLocker Script probe
+on:
+  push:
+    branches: ['**']
+  pull_request:
+  workflow_dispatch:
+permissions:
+  contents: read
+jobs:
+  applocker-script-probe:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-2022, windows-2025]
+        engine: [powershell, pwsh]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+      - name: Fixtures in Windows PowerShell 5.1
+        if: matrix.engine == 'powershell'
+        shell: powershell
+        run: |
+          ./tests/AppLockerScriptProbe.Tests.ps1
+          ./tests/AppLockerScriptProbe.Cli.Tests.ps1
+      - name: Native probe in Windows PowerShell 5.1
+        if: matrix.engine == 'powershell'
+        shell: powershell
+        run: ./tests/AppLockerScriptProbe.Windows.Tests.ps1 -AllowDisposablePolicyWrite
+      - name: Fixtures in PowerShell 7
+        if: matrix.engine == 'pwsh'
+        shell: pwsh
+        run: |
+          ./tests/AppLockerScriptProbe.Tests.ps1
+          ./tests/AppLockerScriptProbe.Cli.Tests.ps1
+      - name: Native probe in PowerShell 7
+        if: matrix.engine == 'pwsh'
+        shell: pwsh
+        run: ./tests/AppLockerScriptProbe.Windows.Tests.ps1 -AllowDisposablePolicyWrite
+      - name: Retain bounded native evidence and cleanup receipt
+        if: always()
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02
+        with:
+          name: applocker-script-${{ matrix.os }}-${{ matrix.engine }}
+          path: ${{ runner.temp }}/wela-applocker-script-native-*/**
+          retention-days: 7
+          if-no-files-found: warn
diff --git a/WELA.ps1 b/WELA.ps1
index 26475edf..4eedd022 100644
--- a/WELA.ps1
+++ b/WELA.ps1
@@ -144,6 +144,9 @@
     [switch]$AllowDnsTraceReset,
     [string[]]$WecRuntimeId,
     [ValidateRange(1,512)][int]$WecRuntimeMaximumSources=128,
+    [ValidateSet('Plan','Run')][string]$AppLockerScriptAction = 'Plan',
+    [string]$AppLockerScriptOutputPath,
+    [ValidateRange(1,30)][int]$AppLockerScriptTimeoutSeconds = 15,
     [ValidateSet('Plan','Run')][string]$AppLockerProbeAction = 'Plan',
     [string]$AppLockerProbeOutputPath,
     [ValidateRange(1,30)][int]$AppLockerProbeTimeoutSeconds = 15,
@@ -182,6 +185,7 @@ $SaclTargetsPath    = Join-Path $ScriptRoot "config/audit_sacl_targets.json"
 . (Join-Path $ScriptRoot "scripts/AdObjectSacl.ps1")
 . (Join-Path $ScriptRoot "scripts/AppLockerReadiness.ps1")
 . (Join-Path $ScriptRoot "scripts/AppLockerProbe.ps1")
+. (Join-Path $ScriptRoot "scripts/AppLockerScriptProbe.ps1")
 . (Join-Path $ScriptRoot "scripts/WmiNamespaceAuditing.ps1")
 . (Join-Path $ScriptRoot "scripts/WmiProbe.ps1")
 . (Join-Path $ScriptRoot "scripts/PowerShellTranscription.ps1")
@@ -1989,6 +1993,7 @@ Usage:
   ./WELA.ps1 wec-state -Help         # Review enable/disable of one existing subscription
   ./WELA.ps1 wec-update -Help        # Review query/description updates on a disabled subscription
   ./WELA.ps1 wmi-probe -Help         # Fixed local read and matched namespace Security4662 evidence
+  ./WELA.ps1 applocker-script-probe -Help # Collect a fixed native Script8005/8006 event
   ./WELA.ps1 applocker-probe -Help   # Collect a fixed native AppLocker EXE event
   ./WELA.ps1 wef-arrival -Help       # Verify exact native probe presence on the local collector
   ./WELA.ps1 native-validation -Help   # Collect a fixed native 4688 probe without changing policy
@@ -2079,6 +2084,8 @@ if ($Cmd -eq 'wec-runtime' -and @($PSBoundParameters.Keys | Where-Object {$_ -no
 }
 if ($Cmd -ne 'wmi-probe' -and @($PSBoundParameters.Keys | Where-Object {$_ -like 'WmiProbe*'}).Count) {throw 'WmiProbe options require wmi-probe.'}
 if ($Cmd -eq 'wmi-probe' -and @($PSBoundParameters.Keys | Where-Object {$_ -notin @('Cmd','WmiProbeAction','WmiProbeNamespace','WmiProbeOutputPath','WmiProbeTimeoutSeconds','Help')}).Count) {throw 'wmi-probe accepts only dedicated probe options.'}
+if ($Cmd -ne 'applocker-script-probe' -and @($PSBoundParameters.Keys | Where-Object {$_ -like 'AppLockerScript*'}).Count) {throw 'AppLockerScript options require applocker-script-probe.'}
+if ($Cmd -eq 'applocker-script-probe' -and ($args.Count -or @($PSBoundParameters.Keys | Where-Object {$_ -notin @('Cmd','AppLockerScriptAction','AppLockerScriptOutputPath','AppLockerScriptTimeoutSeconds','Help')}).Count)) {throw 'applocker-script-probe accepts only its dedicated options.'}
 if ($Cmd -ne 'applocker-probe' -and @($PSBoundParameters.Keys | Where-Object {$_ -in @('AppLockerProbeAction','AppLockerProbeOutputPath','AppLockerProbeTimeoutSeconds')}).Count) {throw 'AppLocker probe options require applocker-probe.'}
 if ($Cmd -eq 'applocker-probe' -and @($PSBoundParameters.Keys | Where-Object {$_ -notin @('Cmd','AppLockerProbeAction','AppLockerProbeOutputPath','AppLockerProbeTimeoutSeconds','Help')}).Count) {throw 'applocker-probe accepts only its dedicated options.'}
 if ($Cmd -ne 'wef-arrival' -and @($PSBoundParameters.Keys | Where-Object {$_ -in @('ArrivalProbePath','ArrivalOutputPath')}).Count) {
@@ -2302,6 +2309,12 @@ switch ($Cmd.ToLower()) {
         $report
         if($report.ExitCode){exit $report.ExitCode}
     }
+    'applocker-script-probe' {
+        if ($Help) {Write-Host 'Usage: applocker-script-probe [-AppLockerScriptAction Plan|Run] [-AppLockerScriptOutputPath new-private-directory] [-AppLockerScriptTimeoutSeconds 1..30]. Requires existing Script AuditOnly policy, running AppIDSvc and enabled MSI and Script channel. Fixed native Windows PowerShell5.1 script, no policy changes or Sigma credit. See docs/applocker-script-probe.md.';return}
+        $report=Invoke-WelaAppLockerScriptProbe -Action $AppLockerScriptAction -OutputPath $AppLockerScriptOutputPath -TimeoutSeconds $AppLockerScriptTimeoutSeconds
+        $report
+        if($report.ExitCode){exit $report.ExitCode}
+    }
     'applocker-probe' {
         if ($Help) {Write-Host 'Usage: applocker-probe [-AppLockerProbeAction Plan|Run] [-AppLockerProbeOutputPath new-private-directory] [-AppLockerProbeTimeoutSeconds 1..30]. Requires existing EXE audit-only policy, running AppIDSvc and enabled channel. Run launches a fixed native cmd.exe copy and collects one exact AppLocker event. See docs/applocker-probe.md.';return}
         $report=Invoke-WelaAppLockerProbe -Action $AppLockerProbeAction -OutputPath $AppLockerProbeOutputPath -TimeoutSeconds $AppLockerProbeTimeoutSeconds
diff --git a/scripts/AppLockerScriptNative.cs b/scripts/AppLockerScriptNative.cs
new file mode 100644
index 00000000..6ba554b1
--- /dev/null
+++ b/scripts/AppLockerScriptNative.cs
@@ -0,0 +1,79 @@
+// Read-only process-token observations. No privilege or authorization changes.
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.InteropServices;
+using System.Security.Principal;
+namespace Wela.AppLockerScript {
+ public sealed class Group { public string Sid; public uint Attributes; }
+ public sealed class Privilege { public string Luid; public uint Attributes; }
+ public sealed class Token {
+  public string Sid, Name, TokenId, ModifiedId, AuthenticationId, AuthenticationType, ImpersonationLevel, TokenSource;
+  public Group[] Groups; public Privilege[] Privileges;
+ }
+ public static class Native {
+  public const string SourceSha256="__WELA_SOURCE_SHA256__";
+  [DllImport("kernel32.dll",ExactSpelling=true)] static extern void GetSystemTimePreciseAsFileTime(out long value);
+  public static DateTime UtcNow() {long value;GetSystemTimePreciseAsFileTime(out value);return DateTime.FromFileTimeUtc(value);}
+  [StructLayout(LayoutKind.Sequential)] struct Luid {public uint Low; public int High;}
+  [StructLayout(LayoutKind.Sequential)] struct Statistics {public Luid TokenId,AuthenticationId;public long Expiration;public int Type,Level;public uint Charged,Available,Groups,Privileges;public Luid Modified;}
+  [StructLayout(LayoutKind.Sequential)] struct SidAndAttributes {public IntPtr Sid;public uint Attributes;}
+  [StructLayout(LayoutKind.Sequential)] struct TokenGroups {public uint Count;public SidAndAttributes First;}
+  [StructLayout(LayoutKind.Sequential)] struct LuidAndAttributes {public Luid Luid;public uint Attributes;}
+  [DllImport("kernel32.dll")] static extern IntPtr GetCurrentProcess();
+  [DllImport("kernel32.dll")] static extern IntPtr GetCurrentThread();
+  [DllImport("kernel32.dll",SetLastError=true)] static extern bool CloseHandle(IntPtr h);
+  [DllImport("advapi32.dll",SetLastError=true)] static extern bool OpenProcessToken(IntPtr p,uint access,out IntPtr t);
+  [DllImport("advapi32.dll",SetLastError=true)] static extern bool OpenThreadToken(IntPtr p,uint access,bool self,out IntPtr t);
+  [DllImport("advapi32.dll",SetLastError=true)] static extern bool GetTokenInformation(IntPtr t,int cls,IntPtr data,int length,out int needed);
+  static string Hex(Luid id) {return "0x"+(((ulong)(uint)id.High<<32)|id.Low).ToString("x");}
+  static IntPtr Read(IntPtr token,int cls,out int length) {
+   GetTokenInformation(token,cls,IntPtr.Zero,0,out length);
+   if(Marshal.GetLastWin32Error()!=122||length<4||length>65536)throw new InvalidOperationException("Unknown or oversized token information.");
+   IntPtr data=Marshal.AllocHGlobal(length);
+   if(!GetTokenInformation(token,cls,data,length,out length)){int error=Marshal.GetLastWin32Error();Marshal.FreeHGlobal(data);throw new Win32Exception(error);}
+   return data;
+  }
+  static Token ReadToken(IntPtr token,string source) {
+    Token result=new Token();result.TokenSource=source;using(WindowsIdentity identity=new WindowsIdentity(token)){result.Sid=identity.User.Value;result.Name=identity.Name;result.AuthenticationType=identity.AuthenticationType;result.ImpersonationLevel=identity.ImpersonationLevel.ToString();}
+    int length;IntPtr p=Read(token,10,out length);
+    try {if(length<Marshal.SizeOf(typeof(Statistics)))throw new InvalidOperationException("Truncated token statistics.");Statistics stats=(Statistics)Marshal.PtrToStructure(p,typeof(Statistics));if(stats.Type!=1)throw new InvalidOperationException("A primary token is required.");result.AuthenticationId=Hex(stats.AuthenticationId);result.TokenId=Hex(stats.TokenId);result.ModifiedId=Hex(stats.Modified);}finally{Marshal.FreeHGlobal(p);}
+    p=Read(token,2,out length);
+    try {int count=Marshal.ReadInt32(p),offset=(int)Marshal.OffsetOf(typeof(TokenGroups),"First"),size=Marshal.SizeOf(typeof(SidAndAttributes));if(count<0||count>4096||offset+(long)count*size>length)throw new InvalidOperationException("Invalid token groups.");List<Group> groups=new List<Group>();for(int i=0;i<count;i++){SidAndAttributes g=(SidAndAttributes)Marshal.PtrToStructure(IntPtr.Add(p,offset+i*size),typeof(SidAndAttributes));groups.Add(new Group{Sid=new SecurityIdentifier(g.Sid).Value,Attributes=g.Attributes});}groups.Sort((a,b)=>String.CompareOrdinal(a.Sid,b.Sid));result.Groups=groups.ToArray();}finally{Marshal.FreeHGlobal(p);}
+    p=Read(token,3,out length);
+    try {int count=Marshal.ReadInt32(p),size=Marshal.SizeOf(typeof(LuidAndAttributes));if(count<0||count>4096||4+(long)count*size>length)throw new InvalidOperationException("Invalid token privileges.");List<Privilege> privileges=new List<Privilege>();for(int i=0;i<count;i++){LuidAndAttributes v=(LuidAndAttributes)Marshal.PtrToStructure(IntPtr.Add(p,4+i*size),typeof(LuidAndAttributes));privileges.Add(new Privilege{Luid=Hex(v.Luid),Attributes=v.Attributes});}privileges.Sort((a,b)=>String.CompareOrdinal(a.Luid,b.Luid));result.Privileges=privileges.ToArray();}finally{Marshal.FreeHGlobal(p);}
+    return result;
+  }
+  public static Token Child(IntPtr handle) {
+   IntPtr token=IntPtr.Zero;
+   if(!OpenProcessToken(handle,8,out token))throw new Win32Exception(Marshal.GetLastWin32Error());
+   try {if(IsTokenRestricted(token))throw new InvalidOperationException("Restricted child token unsupported.");return ReadToken(token,"ChildProcess");}finally{CloseHandle(token);}
+  }
+  [DllImport("advapi32.dll")] static extern bool IsTokenRestricted(IntPtr token);
+  public static Token Snapshot() {
+   IntPtr thread=IntPtr.Zero,process=IntPtr.Zero;
+   if(OpenThreadToken(GetCurrentThread(),8,true,out thread)){CloseHandle(thread);throw new InvalidOperationException("Impersonated callers are unsupported.");}
+   int error=Marshal.GetLastWin32Error();if(error!=1008)throw new Win32Exception(error);
+   if(!OpenProcessToken(GetCurrentProcess(),8,out process))throw new Win32Exception(Marshal.GetLastWin32Error());
+   try {if(IsTokenRestricted(process))throw new InvalidOperationException("Restricted caller unsupported.");return ReadToken(process,"Process");}finally{CloseHandle(process);}
+  }
+  [StructLayout(LayoutKind.Sequential)] struct FileInformation {
+   public uint Attributes;public System.Runtime.InteropServices.ComTypes.FILETIME Creation,Access,Write;
+   public uint Volume,SizeHigh,SizeLow,Links,IndexHigh,IndexLow;
+  }
+  [DllImport("kernel32.dll",SetLastError=true)] static extern bool GetFileInformationByHandle(IntPtr file,out FileInformation info);
+  public static string FileId(IntPtr handle) {
+   FileInformation info;if(!GetFileInformationByHandle(handle,out info))throw new Win32Exception(Marshal.GetLastWin32Error());
+   if((info.Attributes&0x410)!=0)throw new InvalidOperationException("One ordinary non-reparse file identity is required.");
+   return info.Volume.ToString("x8")+":"+info.IndexHigh.ToString("x8")+info.IndexLow.ToString("x8");
+  }
+  public static async System.Threading.Tasks.Task<string> ReadLineBoundedAsync(System.IO.StreamReader reader,int limit) {
+   char[] buffer=new char[1];System.Text.StringBuilder text=new System.Text.StringBuilder();
+   while(true){int count=await reader.ReadAsync(buffer,0,1).ConfigureAwait(false);if(count==0)throw new InvalidOperationException("Owned child ended before its ready marker.");if(buffer[0]=='\n')return text.ToString().TrimEnd('\r');if(text.Length>=limit)throw new InvalidOperationException("Owned child line exceeds the bound.");text.Append(buffer[0]);}
+  }
+  public static async System.Threading.Tasks.Task<string> ReadBoundedAsync(System.IO.StreamReader reader,int limit) {
+   char[] buffer=new char[256];System.Text.StringBuilder text=new System.Text.StringBuilder();
+   while(true){int count=await reader.ReadAsync(buffer,0,buffer.Length).ConfigureAwait(false);if(count==0)return text.ToString();if(text.Length+count>limit)throw new InvalidOperationException("Owned child output exceeds the bound.");text.Append(buffer,0,count);}
+  }
+ }
+}
diff --git a/scripts/AppLockerScriptProbe.ps1 b/scripts/AppLockerScriptProbe.ps1
new file mode 100644
index 00000000..2925b0fa
--- /dev/null
+++ b/scripts/AppLockerScriptProbe.ps1
@@ -0,0 +1,206 @@
+# One fixed native Windows PowerShell script. Never prepares policy/services/channels.
+function Get-WelaAppLockerScriptKey { param($Value) ConvertTo-Json -InputObject $Value -Depth 30 -Compress }
+function Get-WelaAppLockerScriptSources {
+    $sources=[ordered]@{}
+    foreach($path in @('WELA.ps1','scripts/AppLockerScriptProbe.ps1','scripts/AppLockerScriptNative.cs','scripts/AppLockerScriptWorker.ps1','scripts/AppLockerReadiness.ps1','scripts/WefArrival.ps1')) {
+        $sources[$path]=(Get-FileHash -LiteralPath (Join-Path $script:ScriptRoot $path) -Algorithm SHA256 -ErrorAction Stop).Hash.ToLowerInvariant()
+    }
+    [pscustomobject]$sources
+}
+function Initialize-WelaAppLockerScriptNative {
+    if([Environment]::OSVersion.Platform -ne [PlatformID]::Win32NT -or -not [Environment]::Is64BitProcess){throw 'A native 64-bit Windows process is required.'}
+    $bytes=[IO.File]::ReadAllBytes((Join-Path $script:ScriptRoot 'scripts/AppLockerScriptNative.cs'))
+    $hash=Get-WelaArrivalHash $bytes
+    if(-not ('Wela.AppLockerScript.Native' -as [type])) {
+        $text=[Text.UTF8Encoding]::new($false,$true).GetString($bytes).TrimStart([char]0xfeff)
+        if(([regex]::Matches($text,'__WELA_SOURCE_SHA256__')).Count -ne 1){throw 'Unexpected native source fingerprint placeholder.'}
+        Add-Type -TypeDefinition $text.Replace('__WELA_SOURCE_SHA256__',$hash) -ErrorAction Stop
+    }
+    if([Wela.AppLockerScript.Native]::SourceSha256 -cne $hash){throw 'Loaded helper differs from current source; start a fresh PowerShell process.'}
+}
+function Get-WelaAppLockerScriptReader { [Wela.AppLockerScript.Native]::Snapshot() }
+function Get-WelaAppLockerScriptUtcNow { [Wela.AppLockerScript.Native]::UtcNow() }
+function Get-WelaAppLockerScriptExecutionPolicy {
+    $values=[ordered]@{InheritedProcessValue=$env:PSExecutionPolicyPreference;Machine=@();User=@()}
+    foreach($scope in @('Machine','User')) {
+        $base=if($scope -eq 'Machine'){[Microsoft.Win32.Registry]::LocalMachine}else{[Microsoft.Win32.Registry]::CurrentUser}
+        foreach($path in @('SOFTWARE\Policies\Microsoft\Windows\PowerShell','SOFTWARE\Microsoft\PowerShell\1\ShellIds\Microsoft.PowerShell')) {
+            $key=$base.OpenSubKey($path,$false)
+            try {
+                foreach($name in @('EnableScripts','ExecutionPolicy')) {
+                    $present=$null -ne $key -and $name -cin @($key.GetValueNames())
+                    $values[$scope]+=[pscustomobject]@{Path=$path;Name=$name;Present=[bool]$present;Kind=$(if($present){[string]$key.GetValueKind($name)}else{$null});Value=$(if($present){$key.GetValue($name,$null,[Microsoft.Win32.RegistryValueOptions]::DoNotExpandEnvironmentNames)}else{$null})}
+                }
+            }finally{if($key){$key.Dispose()}}
+        }
+    }
+    [pscustomobject]$values
+}
+function Get-WelaAppLockerScriptState {
+    $hostState=Get-WelaAppLockerHost
+    $computer=Get-CimInstance Win32_ComputerSystem -ErrorAction Stop
+    $version=Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion' -ErrorAction Stop
+    $machine=Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Cryptography' -Name MachineGuid -ErrorAction Stop
+    $channel=[Diagnostics.Eventing.Reader.EventLogConfiguration]::new('Microsoft-Windows-AppLocker/MSI and Script')
+    try {$log=[ordered]@{Name=$channel.LogName;Enabled=$channel.IsEnabled;SecurityDescriptor=$channel.SecurityDescriptor;MaximumSize=$channel.MaximumSizeInBytes;Mode=[string]$channel.LogMode;LogFilePath=$channel.LogFilePath}}finally{$channel.Dispose()}
+    $source=Resolve-WelaArrivalPath (Join-Path ([Environment]::SystemDirectory) 'WindowsPowerShell\v1.0\powershell.exe')
+    [pscustomobject][ordered]@{Host=$hostState;MachineGuid=$machine.MachineGuid;UBR=$version.UBR;Computer=[Environment]::MachineName;Domain=[string]$computer.Domain;LocalPolicy=(Get-WelaAppLockerPolicySnapshot Local);EffectivePolicy=(Get-WelaAppLockerPolicySnapshot Effective);Management=(Get-WelaAppLockerManagement);Service=(Get-WelaAppLockerService);Channel=$log;ExecutionPolicy=(Get-WelaAppLockerScriptExecutionPolicy);Source=$source;SourceHash=(Get-FileHash -LiteralPath $source -Algorithm SHA256 -ErrorAction Stop).Hash.ToLowerInvariant()}
+}
+function Get-WelaAppLockerScriptStateKey {
+    param($State)
+    if($State.Host.Status -cne 'Candidate' -or $State.Host.Is64BitProcess -isnot [bool] -or -not $State.Host.Is64BitProcess -or $State.Host.ProductType -notin @(1,3) -or ($State.Host.ProductType -eq 1 -and $State.Host.Build -notin @(22000,22621,22631,26100,26200)) -or ($State.Host.ProductType -eq 3 -and $State.Host.Build -notin @(20348,26100))){throw 'A reviewed native Windows 11 or Server 2022/2025 member host is required; DCs are excluded.'}
+    foreach($policy in @($State.LocalPolicy,$State.EffectivePolicy)){if($policy.Status -cne 'Observed' -or $policy.Policy.HasUnknownPolicyData -isnot [bool] -or $policy.Policy.HasUnknownPolicyData){throw 'Local and effective GP policy must be readable and understood.'}}
+    $collection=@($State.EffectivePolicy.Policy.Collections|Where-Object Type -CEQ 'Script')
+    if($collection.Count -ne 1 -or $collection[0].EnforcementMode -cne 'AuditOnly' -or $collection[0].RuleCount -lt 1){throw 'An existing nonempty effective Script AuditOnly collection is required.'}
+    if($State.Service.Status -cne 'Observed' -or $State.Service.State -cne 'Running'){throw 'AppIDSvc must already be running.'}
+    if($State.Channel.Enabled -isnot [bool] -or -not $State.Channel.Enabled -or $State.Channel.Name -cne 'Microsoft-Windows-AppLocker/MSI and Script' -or -not $State.Channel.SecurityDescriptor){throw 'The native MSI and Script channel must already be enabled and readable.'}
+    if($State.Management.Status -cne 'Observed' -or $State.SourceHash -cnotmatch '^[a-f0-9]{64}$' -or -not $State.MachineGuid -or -not $State.Computer){throw 'Incomplete management, machine or source observation.'}
+    Get-WelaAppLockerScriptKey $State
+}
+function Get-WelaAppLockerScriptAuthorizationKey {
+    param($Token)
+    if($Token.Sid -cnotmatch '^S-1-\d+(-\d+)+$' -or $Token.AuthenticationId -cnotmatch '^0x[0-9a-f]+$' -or $null -eq $Token.Groups -or $null -eq $Token.Privileges){throw 'Incomplete actual token evidence.'}
+    Get-WelaAppLockerScriptKey ([ordered]@{Sid=$Token.Sid;AuthenticationId=$Token.AuthenticationId;Groups=$Token.Groups;Privileges=$Token.Privileges})
+}
+function New-WelaAppLockerScriptText {
+    param([string]$Template,[string]$Nonce)
+    if($Nonce -cnotmatch '^[a-f0-9]{32}$' -or ([regex]::Matches($Template,'__WELA_SCRIPT_NONCE__')).Count -ne 3){throw 'Unexpected fixed worker template or nonce.'}
+    $Template.Replace('__WELA_SCRIPT_NONCE__',$Nonce)
+}
+function Read-WelaAppLockerScriptBoundary {
+    $reader=$null;$record=$null
+    try {
+        $query=[Diagnostics.Eventing.Reader.EventLogQuery]::new('Microsoft-Windows-AppLocker/MSI and Script',[Diagnostics.Eventing.Reader.PathType]::LogName,'*');$query.ReverseDirection=$true;$query.TolerateQueryErrors=$false
+        $reader=[Diagnostics.Eventing.Reader.EventLogReader]::new($query);$reader.BatchSize=1
+        $record=$reader.ReadEvent([TimeSpan]::FromSeconds(5))
+        $status=@($reader.LogStatus)
+        if($status.Count -ne 1 -or $status[0].LogName -cne 'Microsoft-Windows-AppLocker/MSI and Script' -or $status[0].StatusCode -ne 0){throw 'Incomplete native channel query status.'}
+        if($null -eq $record){return [long]0}
+        if($record.LogName -cne $status[0].LogName -or $record.RecordId -le 0){throw 'Invalid native record boundary.'}
+        [long]$record.RecordId
+    }finally{if($record){$record.Dispose()};if($reader){$reader.Dispose()}}
+}
+function Start-WelaAppLockerScriptProcess {
+    param([string]$Root,$State,$Reader,[string]$SourcesKey)
+    $nonce=[guid]::NewGuid().ToString('N');$path=Join-Path $Root ('wela-script-'+$nonce+'.ps1')
+    $template=[IO.File]::ReadAllText((Join-Path $script:ScriptRoot 'scripts/AppLockerScriptWorker.ps1'))
+    $scriptBytes=[Text.UTF8Encoding]::new($false).GetBytes((New-WelaAppLockerScriptText $template $nonce))
+    $artifact=Write-WelaArrivalArtifact $Root ([IO.Path]::GetFileName($path)) ([Text.UTF8Encoding]::new($false).GetString($scriptBytes))
+    $source=$null;$scriptFile=$null;$process=$null;$started=$false
+    try {
+        $source=[IO.File]::Open($State.Source,[IO.FileMode]::Open,[IO.FileAccess]::Read,[IO.FileShare]::Read)
+        $scriptFile=[IO.File]::Open($path,[IO.FileMode]::Open,[IO.FileAccess]::Read,[IO.FileShare]::Read)
+        $sourceId=[Wela.AppLockerScript.Native]::FileId($source.SafeFileHandle.DangerousGetHandle());$scriptId=[Wela.AppLockerScript.Native]::FileId($scriptFile.SafeFileHandle.DangerousGetHandle())
+        if((Get-FileHash -LiteralPath $State.Source -Algorithm SHA256).Hash.ToLowerInvariant() -cne $State.SourceHash -or (Get-FileHash -LiteralPath $path -Algorithm SHA256).Hash.ToLowerInvariant() -cne $artifact.Sha256){throw 'The held native source or generated script differs before launch.'}
+        if((Get-WelaAppLockerScriptKey (Get-WelaAppLockerScriptSources)) -cne $SourcesKey){throw 'Source changed before script launch.'}
+        $readerKey=Get-WelaAppLockerScriptKey $Reader
+        if((Get-WelaAppLockerScriptKey ((Get-WelaAppLockerScriptReader))) -cne $readerKey){throw 'Caller token changed before launch.'}
+        $info=[Diagnostics.ProcessStartInfo]::new();$info.FileName=$State.Source;$info.Arguments='-NoLogo -NoProfile -NonInteractive -File "'+$path+'"';$info.UseShellExecute=$false;$info.CreateNoWindow=$true;$info.RedirectStandardInput=$true;$info.RedirectStandardOutput=$true;$info.RedirectStandardError=$true;$info.WorkingDirectory=$Root
+        $process=[Diagnostics.Process]::new();$process.StartInfo=$info
+        $start=(Get-WelaAppLockerScriptUtcNow)
+        $started=$process.Start();if(-not $started){throw 'The fixed script process did not start.'}
+        $stderr=[Wela.AppLockerScript.Native]::ReadBoundedAsync($process.StandardError,4096)
+        $ready=[Wela.AppLockerScript.Native]::ReadLineBoundedAsync($process.StandardOutput,256)
+        if(-not $ready.Wait(30000)){throw 'The fixed script did not reach its ready marker within thirty seconds.'}
+        $line=$ready.GetAwaiter().GetResult()
+        if($line -cnotmatch ('^WELA_SCRIPT_READY_'+$nonce+'\|(FullLanguage|ConstrainedLanguage)\|5\.1\.[0-9.]+$')){throw ('Unexpected fixed script ready marker: '+$line)}
+        $child=[Wela.AppLockerScript.Native]::Child($process.Handle)
+        if((Get-WelaAppLockerScriptAuthorizationKey $child) -cne (Get-WelaAppLockerScriptAuthorizationKey $Reader)){throw 'The actual child primary/logon authorization differs from the caller.'}
+        if((Get-WelaAppLockerScriptKey ((Get-WelaAppLockerScriptReader))) -cne $readerKey){throw 'Caller token changed while the fixed child started.'}
+        $stdout=[Wela.AppLockerScript.Native]::ReadBoundedAsync($process.StandardOutput,4096)
+        $process.StandardInput.WriteLine('WELA_SCRIPT_GO_'+$nonce);$process.StandardInput.Close()
+        if(-not $process.WaitForExit(10000)){throw 'The fixed child did not complete within ten seconds of release.'}
+        if(-not [Threading.Tasks.Task]::WaitAll([Threading.Tasks.Task[]]@($stdout,$stderr),5000)){throw 'The fixed child output did not complete within five seconds.'}
+        $out=$stdout.GetAwaiter().GetResult();$err=$stderr.GetAwaiter().GetResult();$end=(Get-WelaAppLockerScriptUtcNow)
+        if($process.ExitCode -ne 0 -or $out.TrimEnd("`r","`n") -cne ('WELA_SCRIPT_COMPLETE_'+$nonce) -or $err){throw ('The fixed script did not complete correctly. Exit='+$process.ExitCode+' Error='+$err)}
+        if((Get-WelaAppLockerScriptKey ((Get-WelaAppLockerScriptReader))) -cne $readerKey -or [Wela.AppLockerScript.Native]::FileId($source.SafeFileHandle.DangerousGetHandle()) -cne $sourceId -or [Wela.AppLockerScript.Native]::FileId($scriptFile.SafeFileHandle.DangerousGetHandle()) -cne $scriptId){throw 'Reader or held file identity changed during script execution.'}
+        [pscustomobject][ordered]@{ProcessId=$process.Id;UserSid=$Reader.Sid;ChildToken=$child;NativePowerShell=$State.Source;NativePowerShellSha256=$State.SourceHash;NativePowerShellFileId=$sourceId;ScriptPath=$path;ScriptSha256=$artifact.Sha256;ScriptFileId=$scriptId;ScriptArtifact=$artifact;Nonce=$nonce;Arguments=$info.Arguments;StartedUtc=$start.ToString('o');CompletedUtc=$end.ToString('o');Clock='GetSystemTimePreciseAsFileTime';Ready=$line;Marker=$out.TrimEnd("`r","`n");ExitCode=$process.ExitCode}
+    }finally{
+        if($process){try{if($started -and -not $process.HasExited){$process.Kill();if(-not $process.WaitForExit(5000)){throw 'Owned script process termination is unconfirmed.'}}}finally{$process.Dispose()}}
+        if($scriptFile){$scriptFile.Dispose()};if($source){$source.Dispose()}
+    }
+}
+function Read-WelaAppLockerScriptEvents {
+    param([long]$Boundary)
+    $query="*[System[Provider[@Name='Microsoft-Windows-AppLocker'] and (EventID=8005 or EventID=8006) and EventRecordID>$Boundary]]"
+    $reader=$null;$record=$null;$xml=@();$bytes=0
+    try {
+        $nativeQuery=[Diagnostics.Eventing.Reader.EventLogQuery]::new('Microsoft-Windows-AppLocker/MSI and Script',[Diagnostics.Eventing.Reader.PathType]::LogName,$query);$nativeQuery.ReverseDirection=$false;$nativeQuery.TolerateQueryErrors=$false
+        $reader=[Diagnostics.Eventing.Reader.EventLogReader]::new($nativeQuery);$reader.BatchSize=16
+        while($null -ne ($record=$reader.ReadEvent([TimeSpan]::FromSeconds(2)))) {
+            try{$text=$record.ToXml();$bytes+=[Text.Encoding]::UTF8.GetByteCount($text);if($xml.Count -ge 255 -or $bytes -gt 1048576){throw 'Native script query reached its 256-event/one-MiB cap.'};$xml+=$text}finally{$record.Dispose();$record=$null}
+        }
+        $status=@($reader.LogStatus);if($status.Count -ne 1 -or $status[0].LogName -cne 'Microsoft-Windows-AppLocker/MSI and Script' -or $status[0].StatusCode -ne 0){throw 'Incomplete native script query status.'}
+        [pscustomobject]@{Xml=$xml;Query=$query;Bytes=$bytes;Complete=$true}
+    }finally{if($record){$record.Dispose()};if($reader){$reader.Dispose()}}
+}
+
+function Test-WelaAppLockerScriptEvent {
+    param([string]$Xml,$Process,$State,[long]$Boundary)
+    $reader=$null
+    try {
+        $settings=New-Object Xml.XmlReaderSettings;$settings.DtdProcessing=[Xml.DtdProcessing]::Prohibit;$settings.XmlResolver=$null;$settings.MaxCharactersInDocument=4194304
+        $reader=[Xml.XmlReader]::Create([IO.StringReader]::new($Xml),$settings);$doc=New-Object Xml.XmlDocument;$doc.XmlResolver=$null;$doc.Load($reader)
+        $ns=New-Object Xml.XmlNamespaceManager($doc.NameTable);$ns.AddNamespace('e','http://schemas.microsoft.com/win/2004/08/events/event');$ns.AddNamespace('a','http://schemas.microsoft.com/schemas/event/Microsoft.Windows/1.0.0.0')
+        if ($doc.DocumentElement.LocalName -cne 'Event' -or $doc.DocumentElement.NamespaceURI -cne $ns.LookupNamespace('e') -or $doc.SelectNodes('/e:Event/e:System',$ns).Count -ne 1 -or $doc.SelectNodes('/e:Event/e:UserData/a:RuleAndFileData',$ns).Count -ne 1 -or $doc.SelectNodes('/e:Event/e:EventData',$ns).Count) {return $false}
+        $system=@{};foreach ($name in @('Provider','EventID','Version','EventRecordID','Channel','Computer','TimeCreated')) {$nodes=$doc.SelectNodes("/e:Event/e:System/e:$name",$ns);if($nodes.Count -ne 1){return $false};$system[$name]=$nodes[0]}
+        if ($system.Provider.GetAttribute('Name') -cne 'Microsoft-Windows-AppLocker' -or $system.Provider.GetAttribute('Guid').Trim('{}') -ine 'cbda4dbf-8d5d-4f69-9578-be14aa540d22' -or $system.EventID.InnerText -cnotin @('8005','8006') -or $system.Version.InnerText -cne '0' -or $system.EventRecordID.InnerText -notmatch '^[1-9][0-9]*$' -or $system.Channel.InnerText -cne 'Microsoft-Windows-AppLocker/MSI and Script') {return $false}
+        $computers=@($State.Computer);if($State.Host.PartOfDomain){$computers+=$State.Computer+'.'+$State.Domain};if($system.Computer.InnerText -notin $computers){return $false}
+        $time=ConvertTo-WelaArrivalUtc $system.TimeCreated.GetAttribute('SystemTime')
+        if($time.UtcDateTime -lt ([DateTimeOffset]::Parse($Process.StartedUtc)).UtcDateTime -or $time.UtcDateTime -gt (ConvertTo-WelaArrivalUtc $Process.CompletedUtc).UtcDateTime -or [long]$system.EventRecordID.InnerText -le $Boundary){return $false}
+        $data=@{};foreach($node in $doc.SelectSingleNode('/e:Event/e:UserData/a:RuleAndFileData',$ns).ChildNodes){if($node.NodeType -eq 'Whitespace'){continue};if($node.NodeType -ne 'Element' -or $node.NamespaceURI -cne $ns.LookupNamespace('a') -or $data.ContainsKey($node.LocalName) -or @($node.ChildNodes|Where-Object NodeType -eq Element).Count){return $false};$data[$node.LocalName]=$node.InnerText}
+        if($data.PolicyName -cne 'SCRIPT' -or $data.TargetUser -cne $Process.UserSid -or $data.TargetProcessId -notmatch '^[1-9][0-9]*$' -or [long]$data.TargetProcessId -ne $Process.ProcessId){return $false}
+        # AppLocker may render the exact Windows directory through this documented path variable.
+        $eventPath=$data.FilePath
+        if($eventPath -imatch '^%OSDRIVE%\\'){$eventPath=[IO.Path]::GetPathRoot($State.Source).TrimEnd('\')+$eventPath.Substring(9)}
+        return $eventPath -ieq $Process.ScriptPath
+    } catch {return $false} finally {if($reader){$reader.Dispose()}}
+}
+function Invoke-WelaAppLockerScriptProbe {
+    param([ValidateSet('Plan','Run')][string]$Action='Plan',[string]$OutputPath,[ValidateRange(1,30)][int]$TimeoutSeconds=15)
+    if(($Action -eq 'Run') -ne (-not [string]::IsNullOrWhiteSpace($OutputPath))){throw 'Run requires a new AppLockerScriptOutputPath; Plan does not write files.'}
+    Initialize-WelaAppLockerScriptNative
+    $sources=Get-WelaAppLockerScriptSources;$sourceKey=Get-WelaAppLockerScriptKey $sources
+    $report=[pscustomobject][ordered]@{SchemaVersion=1;Kind='WelaAppLockerScriptProbe';Action=$Action;Status='Unverified';ExitCode=1;RecordedUtc=(Get-WelaAppLockerScriptUtcNow).ToString('o');Sources=$sources;Before=$null;After=$null;ReaderBefore=$null;ReaderAfter=$null;ReaderInterval='After output/context preparation, through child execution and actual event queries; final metadata is checked separately';Boundary=$null;Process=$null;EventId=$null;Decision=$null;Artifacts=@();Diagnostic='';OutputPath=$null;PolicyChanges=0;ReadyRuleCredit=0;CspPolicyState='Unknown';Scope='One fixed native Windows PowerShell5.1 Script-collection event. Other engines, collections, forwarding and Sigma/backend validation are not tested. Sysmon excluded.'}
+    try {
+        $before=Get-WelaAppLockerScriptState;$report.Before=$before;$key=Get-WelaAppLockerScriptStateKey $before
+        if($Action -eq 'Plan'){$report.ReaderBefore=(Get-WelaAppLockerScriptReader);$report.Status='PrerequisitesObserved';$report.ExitCode=0;return $report}
+        $report.OutputPath=New-WelaArrivalOutput -Path $OutputPath -SourcePath $script:ScriptRoot
+        if((Get-WelaAppLockerScriptStateKey (Get-WelaAppLockerScriptState)) -cne $key){throw 'Context changed during output preparation.'}
+        $report.Artifacts+=Write-WelaArrivalArtifact $report.OutputPath 'before.json' ($before|ConvertTo-Json -Depth 24)
+        $reader=(Get-WelaAppLockerScriptReader);$report.ReaderBefore=$reader;$readerKey=Get-WelaAppLockerScriptKey $reader
+        $report.Boundary=Read-WelaAppLockerScriptBoundary
+        if((Get-WelaAppLockerScriptKey ((Get-WelaAppLockerScriptReader))) -cne $readerKey){throw 'Reader changed during the actual boundary query.'}
+        $process=Start-WelaAppLockerScriptProcess -Root $report.OutputPath -State $before -Reader $reader -SourcesKey $sourceKey;$report.Process=$process
+        $report.Artifacts+= $process.ScriptArtifact
+        $report.Artifacts+=Write-WelaArrivalArtifact $report.OutputPath 'process.json' ($process|ConvertTo-Json -Depth 16)
+        $timer=[Diagnostics.Stopwatch]::StartNew();$matches=@();$batch=$null
+        do {
+            if((Get-WelaAppLockerScriptKey ((Get-WelaAppLockerScriptReader))) -cne $readerKey){throw 'Reader changed before script event query.'}
+            $batch=Read-WelaAppLockerScriptEvents $report.Boundary
+            if($batch.Complete -isnot [bool] -or -not $batch.Complete){throw 'Script query completeness is unknown.'}
+            if((Get-WelaAppLockerScriptKey ((Get-WelaAppLockerScriptReader))) -cne $readerKey){throw 'Reader changed during script event query.'}
+            $matches=@($batch.Xml|Where-Object{Test-WelaAppLockerScriptEvent $_ $process $before $report.Boundary})
+            if($matches.Count -gt 1){throw 'Multiple exact script records make the result ambiguous.'}
+            if($matches.Count -eq 1){break}
+            Start-Sleep -Milliseconds 250
+        }while($timer.Elapsed.TotalSeconds -lt $TimeoutSeconds)
+        $report.ReaderAfter=(Get-WelaAppLockerScriptReader)
+        if((Get-WelaAppLockerScriptKey $report.ReaderAfter) -cne $readerKey){throw 'Reader changed before completion of the actual query interval.'}
+        if($matches.Count -ne 1){
+            # Retain only bounded candidates bearing the owned unique script name.
+            $owned=@($batch.Xml|Where-Object{$_ -like ('*wela-script-'+$process.Nonce+'.ps1*')}|Select-Object -First 4)
+            for($i=0;$i -lt $owned.Count;$i++){$report.Artifacts+=Write-WelaArrivalArtifact $report.OutputPath ('candidate-'+$i+'.xml') $owned[$i]}
+            throw 'No exact native Script8005/8006 event arrived within the timeout.'
+        }
+        $report.After=Get-WelaAppLockerScriptState
+        if((Get-WelaAppLockerScriptStateKey $report.After) -cne $key -or (Get-WelaAppLockerScriptKey (Get-WelaAppLockerScriptSources)) -cne $sourceKey -or (Get-FileHash -LiteralPath $process.ScriptPath -Algorithm SHA256).Hash.ToLowerInvariant() -cne $process.ScriptSha256){throw 'Host, policy, service, channel, execution-policy observation or implementation changed.'}
+        $report.Artifacts+=Write-WelaArrivalArtifact $report.OutputPath 'after.json' ($report.After|ConvertTo-Json -Depth 24)
+        $report.Artifacts+=Write-WelaArrivalArtifact $report.OutputPath 'event.xml' $matches[0]
+        $event=[xml]$matches[0];$report.EventId=[int]$event.Event.System.EventID
+        $report.Decision=if($report.EventId -eq 8005){'Allowed'}else{'AllowedWouldBlockIfEnforced'}
+        $report.Status='NativeScriptEventObserved';$report.ExitCode=0
+    }catch{$report.Diagnostic=$_.Exception.Message}
+    if($report.OutputPath){$json=$report|ConvertTo-Json -Depth 32;if([Text.Encoding]::UTF8.GetByteCount($json) -gt 2097152){throw 'The script probe report exceeded its two-MiB bound.'};$null=Write-WelaArrivalArtifact $report.OutputPath 'manifest.json' $json}
+    $report
+}
diff --git a/scripts/AppLockerScriptWorker.ps1 b/scripts/AppLockerScriptWorker.ps1
new file mode 100644
index 00000000..2ebb46fe
--- /dev/null
+++ b/scripts/AppLockerScriptWorker.ps1
@@ -0,0 +1,7 @@
+# Fixed locally generated script; no external inputs or configuration writes.
+$ErrorActionPreference = 'Stop'
+[Console]::Out.WriteLine(('WELA_SCRIPT_READY___WELA_SCRIPT_NONCE__|' + $ExecutionContext.SessionState.LanguageMode + '|' + $PSVersionTable.PSVersion))
+$release = [Console]::In.ReadLine()
+if ($release -cne 'WELA_SCRIPT_GO___WELA_SCRIPT_NONCE__') { exit 17 }
+[Console]::Out.WriteLine('WELA_SCRIPT_COMPLETE___WELA_SCRIPT_NONCE__')
+exit 0
diff --git a/tests/AppLockerScriptProbe.Cli.Tests.ps1 b/tests/AppLockerScriptProbe.Cli.Tests.ps1
new file mode 100644
index 00000000..fc7a575d
--- /dev/null
+++ b/tests/AppLockerScriptProbe.Cli.Tests.ps1
@@ -0,0 +1,25 @@
+$ErrorActionPreference='Stop'
+$repo=Split-Path $PSScriptRoot -Parent
+$engine=Join-Path $PSHOME $(if($PSEdition -eq 'Core'){if($env:OS -eq 'Windows_NT'){'pwsh.exe'}else{'pwsh'}}else{'powershell.exe'})
+$count=0
+function Check-Command([string]$Arguments,[int]$ExpectedExit,[string]$Pattern) {
+ $info=[Diagnostics.ProcessStartInfo]::new();$info.FileName=$engine;$info.Arguments='-NoProfile -File "'+(Join-Path $repo 'WELA.ps1')+'" '+$Arguments;$info.UseShellExecute=$false;$info.CreateNoWindow=$true;$info.RedirectStandardOutput=$true;$info.RedirectStandardError=$true
+ $process=[Diagnostics.Process]::new();$process.StartInfo=$info;$started=$false
+ try {
+  $started=$process.Start();$out=$process.StandardOutput.ReadToEndAsync();$err=$process.StandardError.ReadToEndAsync()
+  if(-not $process.WaitForExit(30000)){throw 'CLI timeout'}
+  if(-not [Threading.Tasks.Task]::WaitAll([Threading.Tasks.Task[]]@($out,$err),5000)){throw 'CLI output timeout'}
+  $text=$out.GetAwaiter().GetResult()+$err.GetAwaiter().GetResult()
+  if(($process.ExitCode -eq 0) -ne ($ExpectedExit -eq 0) -or $text -notmatch $Pattern){throw "CLI mismatch: $Arguments ; Exit=$($process.ExitCode) ; $text"};$script:count++
+ }finally{if($started -and -not $process.HasExited){$process.Kill();$null=$process.WaitForExit(5000)};$process.Dispose()}
+}
+Check-Command 'applocker-script-probe -Help' 0 'existing Script AuditOnly'
+Check-Command 'help' 0 'applocker-script-probe'
+Check-Command 'version -AppLockerScriptAction Run' 1 'AppLockerScript options require'
+Check-Command 'applocker-script-probe -AppLockerScriptAction Run -WhatIf' 1 'only its dedicated'
+Check-Command 'applocker-script-probe -AppLockerScriptAction Run -DryRun' 1 'only its dedicated'
+Check-Command 'applocker-script-probe -Auto' 1 'only its dedicated'
+Check-Command 'applocker-script-probe -AppLockerProbeAction Run' 1 'only its dedicated'
+Check-Command 'applocker-script-probe -AppLockerScriptAction Run' 1 'Run requires'
+Check-Command 'applocker-script-probe -AppLockerScriptAction Plan -AppLockerScriptOutputPath ignored' 1 'Run requires'
+Write-Host "AppLocker Script public CLI fixtures passed: $count checks."
diff --git a/tests/AppLockerScriptProbe.Tests.ps1 b/tests/AppLockerScriptProbe.Tests.ps1
new file mode 100644
index 00000000..971e915d
--- /dev/null
+++ b/tests/AppLockerScriptProbe.Tests.ps1
@@ -0,0 +1,67 @@
+$ErrorActionPreference='Stop'
+$repo=Split-Path $PSScriptRoot -Parent
+. "$repo/scripts/AppLockerReadiness.ps1"
+. "$repo/scripts/WefArrival.ps1"
+. "$repo/scripts/AppLockerScriptProbe.ps1"
+$count=0
+function Assert($Value,$Message){if(-not $Value){throw $Message};$script:count++}
+function Reject([scriptblock]$Action,[string]$Pattern){$message='';try{&$Action|Out-Null}catch{$message=$_.Exception.Message};Assert ($message -match $Pattern) "Expected $Pattern; got $message"}
+$policy='<AppLockerPolicy Version="1"><RuleCollection Type="Script" EnforcementMode="AuditOnly"><FilePathRule Id="12345678-1234-1234-1234-123456789abc" Name="Windows" UserOrGroupSid="S-1-1-0" Action="Allow"><Conditions><FilePathCondition Path="%WINDIR%\*" /></Conditions></FilePathRule></RuleCollection></AppLockerPolicy>'
+$state=[pscustomobject]@{Host=[pscustomobject]@{Status='Candidate';Is64BitProcess=$true;PartOfDomain=$false;ProductType=3;Build=20348};MachineGuid='11111111-1111-1111-1111-111111111111';Management=[pscustomobject]@{Status='Observed'};Computer='TEST';Domain='WORKGROUP';Reader=[pscustomobject]@{Sid='S-1-5-21-1-2-3-1000'};EffectivePolicy=[pscustomobject]@{Status='Observed';Policy=(ConvertFrom-WelaAppLockerXml $policy)};Service=[pscustomobject]@{Status='Observed';State='Running';StartMode='Manual'};Channel=[pscustomobject]@{Name='Microsoft-Windows-AppLocker/MSI and Script';Enabled=$true;SecurityDescriptor='O:SYG:SYD:(A;;0x1;;;SY)'};Source='C:\Windows\System32\cmd.ps1';SourceHash=('a'*64)}
+$state|Add-Member NoteProperty LocalPolicy ($state.EffectivePolicy|ConvertTo-Json -Depth 20|ConvertFrom-Json)
+$null=Get-WelaAppLockerScriptStateKey $state;Assert $true 'Valid audit-only prereqs'
+foreach($mode in @('Enabled','NotConfigured')){$state.EffectivePolicy.Policy=ConvertFrom-WelaAppLockerXml ($policy.Replace('AuditOnly',$mode));Reject {Get-WelaAppLockerScriptStateKey $state} 'AuditOnly'}
+$state.EffectivePolicy.Policy=ConvertFrom-WelaAppLockerXml $policy
+$state.Service.State='Stopped';Reject {Get-WelaAppLockerScriptStateKey $state} 'already be running';$state.Service.State='Running'
+$state.Channel.Enabled=$false;Reject {Get-WelaAppLockerScriptStateKey $state} 'enabled';$state.Channel.Enabled=$true
+$process=[pscustomobject]@{ScriptPath='C:\Temp\wela-owned.ps1';ProcessId=1234;UserSid=$state.Reader.Sid;StartedUtc='2026-09-01T00:00:00.0000000Z';CompletedUtc='2026-09-01T00:00:02.0000000Z'}
+$event='<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-AppLocker" Guid="{cbda4dbf-8d5d-4f69-9578-be14aa540d22}"/><EventID>8006</EventID><Version>0</Version><EventRecordID>42</EventRecordID><TimeCreated SystemTime="2026-09-01T00:00:01.0000000Z"/><Channel>Microsoft-Windows-AppLocker/MSI and Script</Channel><Computer>TEST</Computer></System><UserData><RuleAndFileData xmlns="http://schemas.microsoft.com/schemas/event/Microsoft.Windows/1.0.0.0"><PolicyName>SCRIPT</PolicyName><TargetUser>S-1-5-21-1-2-3-1000</TargetUser><TargetProcessId>1234</TargetProcessId><FilePath>C:\Temp\wela-owned.ps1</FilePath></RuleAndFileData></UserData></Event>'
+$end=[long]41
+Assert (Test-WelaAppLockerScriptEvent $event $process $state $end) 'Exact fixture must match'
+Assert (Test-WelaAppLockerScriptEvent ($event.Replace('8006','8005')) $process $state $end) 'Allowed event matches but has distinct EventId'
+$mutations=@(@('8006','8007'),@('1234','1235'),@('S-1-5-21-1-2-3-1000','S-1-5-21-1-2-3-1001'),@('C:\Temp\wela-owned.ps1','C:\Temp\other.ps1'),@('<PolicyName>SCRIPT','<PolicyName>DLL'),@('<Computer>TEST','<Computer>OTHER'),@('cbda4dbf','abda4dbf'),@('<Version>0','<Version>1'),@('00:00:01.0000000Z','00:00:03.0000000Z'),@('</System>','<EventID>8006</EventID></System>'),@('</RuleAndFileData>','<TargetUser>S-1-1-0</TargetUser></RuleAndFileData>'))
+foreach($pair in $mutations){$bad=$event.Replace($pair[0],$pair[1]);Assert ($bad -cne $event) 'Mutation changed fixture';Assert (-not(Test-WelaAppLockerScriptEvent $bad $process $state $end)) ('Reject '+$pair[0])}
+Assert (-not(Test-WelaAppLockerScriptEvent ('<!DOCTYPE Event [<!ENTITY x SYSTEM "file:///etc/passwd">]>'+$event) $process $state $end)) 'DTD rejected'
+Reject {Invoke-WelaAppLockerScriptProbe -Action Run} 'requires'
+Reject {Invoke-WelaAppLockerScriptProbe -Action Plan -OutputPath ignored} 'requires'
+
+Assert (-not(Test-WelaAppLockerScriptEvent $event $process $state 42)) 'Previously observed record is rejected'
+Assert (-not(Test-WelaAppLockerScriptEvent ($event.Replace('00:00:01.0000000Z','00:00:02.0000001Z')) $process $state $end)) 'A 100ns late record is rejected without clock padding'
+Assert (Test-WelaAppLockerScriptEvent ($event.Replace('00:00:01.0000000Z','00:00:00.0000000Z')) $process $state $end) 'Exact inclusive start is accepted'
+Assert (Test-WelaAppLockerScriptEvent ($event.Replace('00:00:01.0000000Z','00:00:02.0000000Z')) $process $state $end) 'Exact inclusive completion is accepted'
+$worker=[IO.File]::ReadAllText("$repo/scripts/AppLockerScriptWorker.ps1")
+$text=New-WelaAppLockerScriptText $worker ('a'*32)
+Assert ($text -notlike '*__WELA_SCRIPT_NONCE__*') 'All three fixed nonce placeholders replaced'
+Reject {New-WelaAppLockerScriptText $worker ('a'*31+"'" )} 'nonce'
+Reject {New-WelaAppLockerScriptText ($worker+'__WELA_SCRIPT_NONCE__') ('a'*32)} 'template'
+$tokens=$null;$errors=$null;$null=[Management.Automation.Language.Parser]::ParseInput($text,[ref]$tokens,[ref]$errors)
+Assert (-not $errors.Count) 'Generated worker parses'
+# Use the production orchestration with mocked native read/launch boundaries.
+# These fixtures never stand in for actual native success; the Windows matrix does that.
+$script:ScriptRoot=$repo;$script:scenario='ok';$script:reads=0;$script:state=$state;$script:event=$event
+$script:token=[pscustomobject]@{Sid='S-1-5-21-1-2-3-1000';AuthenticationId='0x123';Groups=@();Privileges=@();TokenId='0x456';ModifiedId='0x789'}
+function Initialize-WelaAppLockerScriptNative {}
+function Get-WelaAppLockerScriptReader {if($script:scenario -eq 'reader-drift' -and $script:reads -gt 2){$script:token.ModifiedId='0xabc'};$script:token|ConvertTo-Json -Depth 8|ConvertFrom-Json}
+function Get-WelaAppLockerScriptUtcNow {([DateTimeOffset]::Parse('2026-09-01T00:00:00Z')).UtcDateTime}
+function Get-WelaAppLockerScriptState {$script:reads++;if($script:scenario -eq 'drift' -and $script:reads -gt 2){$script:state.Service.StartMode='Auto'};$script:state|ConvertTo-Json -Depth 20|ConvertFrom-Json}
+function Read-WelaAppLockerScriptBoundary {41}
+function Start-WelaAppLockerScriptProcess {
+ param($Root,$State,$Reader,$SourcesKey)
+ if($script:scenario -eq 'reader-drift'){$script:token.ModifiedId='0xabc'}
+ $artifact=Write-WelaArrivalArtifact $Root 'fixed.ps1' 'fixed'
+ [pscustomobject]@{ScriptPath=(Join-Path $Root 'fixed.ps1');ScriptSha256=$artifact.Sha256;ScriptArtifact=$artifact;Nonce=('a'*32)}
+}
+function Read-WelaAppLockerScriptEvents {param($Boundary);if($script:scenario -eq 'denied'){throw [UnauthorizedAccessException]::new('Native query denied')};[pscustomobject]@{Xml=if($script:scenario -eq 'duplicate'){@($script:event,$script:event)}elseif($script:scenario -eq 'absent'){@()}else{@($script:event)};Complete=($script:scenario -ne 'cap')}}
+function Test-WelaAppLockerScriptEvent {$true}
+$root=Join-Path ([IO.Path]::GetTempPath()) ('wela-applocker-script-test-'+[guid]::NewGuid().ToString('N'));$null=New-Item -ItemType Directory $root
+try {
+ foreach($scenario in @('ok','duplicate','drift','cap','denied','absent','reader-drift')){
+  $script:scenario=$scenario;$script:reads=0;$state.Service.StartMode='Manual';$script:token.ModifiedId='0x789'
+  $result=Invoke-WelaAppLockerScriptProbe Run (Join-Path $root $scenario) 1
+  Assert ($result.ReadyRuleCredit -eq 0 -and $result.PolicyChanges -eq 0) 'No readiness or configuration credit'
+  Assert (($result.ExitCode -eq 0) -eq ($scenario -eq 'ok')) "Expected outcome $scenario : $($result.Diagnostic)"
+  Assert (($result.Status -ceq 'NativeScriptEventObserved') -eq ($scenario -eq 'ok')) 'Only complete success receives observed status'
+  Assert (Test-Path (Join-Path $result.OutputPath 'manifest.json')) 'Success/failure manifest retained'
+ }
+}finally{Remove-Item -LiteralPath $root -Recurse -Force}
+Write-Host "AppLocker Script fixtures passed: $count assertions."
diff --git a/tests/AppLockerScriptProbe.Windows.Tests.ps1 b/tests/AppLockerScriptProbe.Windows.Tests.ps1
new file mode 100644
index 00000000..8f0eaef4
--- /dev/null
+++ b/tests/AppLockerScriptProbe.Windows.Tests.ps1
@@ -0,0 +1,134 @@
+param([switch]$AllowDisposablePolicyWrite)
+$ErrorActionPreference='Stop'
+if($env:OS -ne 'Windows_NT'){Write-Host 'Skipped: Windows required.';exit 0}
+if(-not $AllowDisposablePolicyWrite -or $env:GITHUB_ACTIONS -ne 'true' -or $env:RUNNER_ENVIRONMENT -ne 'github-hosted'){throw 'Explicit disposable GitHub-hosted policy-write opt-in required.'}
+function Refresh-DisposableComputerPolicy {
+ $info=New-Object Diagnostics.ProcessStartInfo
+ $info.FileName=Join-Path ([Environment]::SystemDirectory) 'gpupdate.exe';$info.Arguments='/target:computer /force /wait:30';$info.UseShellExecute=$false
+ $process=[Diagnostics.Process]::Start($info)
+ try {if(-not $process.WaitForExit(60000)){$process.Kill();throw 'Disposable computer policy refresh exceeded 60 seconds.'};if($process.ExitCode -ne 0){throw ('Disposable computer policy refresh failed: '+$process.ExitCode)}} finally {$process.Dispose()}
+}
+function Stop-DisposablePolicyConverter {
+ $task=Get-ScheduledTask -TaskPath '\Microsoft\Windows\AppID\' -TaskName 'PolicyConverter' -ErrorAction Stop
+ if($task.State -in @('Running','Queued')) {Stop-ScheduledTask -InputObject $task -ErrorAction Stop}
+ $deadline=[DateTime]::UtcNow.AddSeconds(15)
+ do {$task=Get-ScheduledTask -TaskPath '\Microsoft\Windows\AppID\' -TaskName 'PolicyConverter' -ErrorAction Stop;if($task.State -in @('Ready','Disabled')){return};Start-Sleep -Milliseconds 200}while([DateTime]::UtcNow -lt $deadline)
+ throw 'The verified borrowed PolicyConverter task did not become idle.'
+}
+function Run-DisposablePolicyConverter {
+ # The Task Scheduler CIM provider can retain stale LastRunTime on Server2022.
+ # Follow the actual COM Run instance and native completion state instead.
+ $scheduler=$null;$folder=$null;$registered=$null;$instance=$null;$running=$null;$definition=$null;$settings=$null
+ try {
+  $scheduler=New-Object -ComObject 'Schedule.Service';$scheduler.Connect()
+  $folder=$scheduler.GetFolder('\Microsoft\Windows\AppID');$registered=$folder.GetTask('PolicyConverter')
+  $definition=$registered.Definition;$settings=$definition.Settings
+  if(-not $settings.AllowDemandStart){throw 'The verified PolicyConverter task does not allow an on-demand invocation.'}
+  $running=$registered.GetInstances(0)
+  if($running.Count -ne 0 -or $registered.State -ne 3){throw 'The verified borrowed PolicyConverter task must be idle before invocation.'}
+  $null=[Runtime.InteropServices.Marshal]::FinalReleaseComObject($running);$running=$null
+  $instance=$registered.Run($null)
+  if($null -eq $instance -or [string]::IsNullOrWhiteSpace($instance.InstanceGuid)){throw 'Native PolicyConverter did not return a task instance identity.'}
+  $instanceId=[string]$instance.InstanceGuid;$deadline=[DateTime]::UtcNow.AddSeconds(30)
+  do {
+   $running=$registered.GetInstances(0)
+   try {$idle=$running.Count -eq 0 -and $registered.State -eq 3}finally{$null=[Runtime.InteropServices.Marshal]::FinalReleaseComObject($running);$running=$null}
+   if($idle){if($registered.LastTaskResult -ne 0){throw ('Native policy conversion failed: '+$registered.LastTaskResult)};Write-Host ('Native PolicyConverter instance completed: '+$instanceId);return}
+   Start-Sleep -Milliseconds 200
+  }while([DateTime]::UtcNow -lt $deadline)
+  Stop-DisposablePolicyConverter
+  throw 'The owned native PolicyConverter instance did not complete within thirty seconds.'
+ }finally{foreach($item in @($running,$instance,$settings,$definition,$registered,$folder,$scheduler)){if($null -ne $item -and [Runtime.InteropServices.Marshal]::IsComObject($item)){$null=[Runtime.InteropServices.Marshal]::FinalReleaseComObject($item)}}}
+}
+
+$repo=Split-Path $PSScriptRoot -Parent
+. "$repo/scripts/Configuration.ps1"
+. "$repo/scripts/AppLockerReadiness.ps1"
+. "$repo/scripts/WefArrival.ps1"
+. "$repo/scripts/AppLockerScriptProbe.ps1"
+$script:ScriptRoot=$repo
+$root=Join-Path $env:RUNNER_TEMP ('wela-applocker-script-native-'+[guid]::NewGuid().ToString('N'));$null=New-Item -ItemType Directory $root
+Write-Host ('Native fixture process session: '+[Diagnostics.Process]::GetCurrentProcess().SessionId)
+$converter=Get-ScheduledTask -TaskPath '\Microsoft\Windows\AppID\' -TaskName 'PolicyConverter' -ErrorAction Stop
+$converterBefore=Export-ScheduledTask -InputObject $converter -ErrorAction Stop
+$converterDisabled=$converter.State -eq 'Disabled';$converterChanged=$false
+$actions=@($converter.Actions)
+if($converter.State -notin @('Disabled','Ready') -or $actions.Count -ne 1 -or [Environment]::ExpandEnvironmentVariables($actions[0].Execute).Trim('"') -ine (Join-Path ([Environment]::SystemDirectory) 'appidpolicyconverter.exe') -or $actions[0].Arguments){throw ('Only the unchanged native PolicyConverter action is permitted: '+($actions|ConvertTo-Json -Depth 8))}
+$before=Get-WelaAppLockerReadiness
+if($before.Host.PartOfDomain -or $before.Management.Status -ne 'Observed' -or $before.LocalPolicy.Status -ne 'Observed' -or $before.EffectiveGpPolicy.Status -ne 'Observed' -or $before.LocalPolicy.Policy.TotalRules -ne 0 -or $before.EffectiveGpPolicy.Policy.TotalRules -ne 0 -or $before.LocalPolicy.Policy.HasUnknownPolicyData -or $before.EffectiveGpPolicy.Policy.HasUnknownPolicyData){Write-Host ($before | ConvertTo-Json -Depth 16);throw 'Disposable test requires empty, understood local/effective policies on a non-domain disposable host.'}
+$backup=Join-Path $root 'policy-before.xml';[IO.File]::WriteAllText($backup,$before.LocalPolicy.Policy.Xml)
+[IO.File]::WriteAllText((Join-Path $root 'prerequisites-before.json'),($before | ConvertTo-Json -Depth 16))
+$fixture='<AppLockerPolicy Version="1"><RuleCollection Type="Script" EnforcementMode="AuditOnly"><FilePathRule Id="12345678-1234-1234-1234-123456789abc" Name="Disposable Windows path only" Description="Owned native event fixture" UserOrGroupSid="S-1-1-0" Action="Allow"><Conditions><FilePathCondition Path="%WINDIR%\*" /></Conditions></FilePathRule></RuleCollection></AppLockerPolicy>'
+$policyPath=Join-Path $root 'fixture.xml';[IO.File]::WriteAllText($policyPath,$fixture)
+$log=[Diagnostics.Eventing.Reader.EventLogConfiguration]::new('Microsoft-Windows-AppLocker/MSI and Script');$enabled=$log.IsEnabled;$touched=$false;$cleanup=@();$primary=$null
+try {
+ $touched=$true
+ # Test-only preparation under explicit disposable-host and empty-GP gates.
+ # Hosted images contain enrollment/provider keys: preserve them and CSP Unknown.
+ # The production importer must continue to reject those observations.
+ $preparedUtc=[DateTime]::UtcNow
+ Set-AppLockerPolicy -XmlPolicy $policyPath -ErrorAction Stop
+ if($before.Service.StartMode -eq 'Disabled'){throw 'Test will not change protected AppIDSvc startup mode.'}
+ if($before.Service.State -ne 'Running'){Start-Service AppIDSvc -ErrorAction Stop}
+ $log.IsEnabled=$true;$log.SaveChanges()
+ if($converterDisabled){$converterChanged=$true;$null=Enable-ScheduledTask -InputObject $converter -ErrorAction Stop}
+ Refresh-DisposableComputerPolicy
+ Run-DisposablePolicyConverter
+ $applied=$false;$applyDeadline=[DateTime]::UtcNow.AddSeconds(30)
+ do {
+  $records=@()
+  try {try{$records=@(Get-WinEvent -FilterHashtable @{LogName='Microsoft-Windows-AppLocker/EXE and DLL';Id=8001;StartTime=$preparedUtc} -MaxEvents 10 -ErrorAction Stop)}catch{if($_.FullyQualifiedErrorId -notlike 'NoMatchingEventsFound*'){throw}};$applied=$records.Count -gt 0} finally {foreach($record in $records){$record.Dispose()}}
+  if($applied){break};Start-Sleep -Milliseconds 250
+ } while([DateTime]::UtcNow -lt $applyDeadline)
+ if(-not $applied){throw 'No native 8001 policy-applied event after disposable GP refresh.'}
+ Write-Host 'Native 8001 policy-applied evidence observed after disposable GP refresh.'
+ # Wait for actual effective audit-only policy, without treating elapsed time as success.
+ $deadline=[DateTime]::UtcNow.AddSeconds(30)
+ do {$state=Get-WelaAppLockerScriptState;$ready=$false;try{$null=Get-WelaAppLockerScriptStateKey $state;$ready=$true}catch{};if($ready){break};Start-Sleep -Milliseconds 500}while([DateTime]::UtcNow -lt $deadline)
+ foreach($decision in @('WouldBlock','Allowed')) {
+  if($decision -eq 'Allowed'){
+   [IO.File]::WriteAllText($policyPath,$fixture.Replace('%WINDIR%\*','*'))
+   Set-AppLockerPolicy -XmlPolicy $policyPath -ErrorAction Stop
+   Refresh-DisposableComputerPolicy;Run-DisposablePolicyConverter
+   $expected=ConvertFrom-WelaAppLockerXml ([IO.File]::ReadAllText($policyPath))
+   $actual=Get-WelaAppLockerPolicySnapshot Effective
+   if($actual.Status -ne 'Observed' -or (Get-WelaAppLockerXmlKey $actual.Policy.Xml) -cne (Get-WelaAppLockerXmlKey $expected.Xml)){throw 'Actual allowed Script policy differs from the disposable fixture.'}
+  }
+  $probe=& "$repo/WELA.ps1" applocker-script-probe -AppLockerScriptAction Run -AppLockerScriptOutputPath (Join-Path $root ('evidence-'+$decision)) -AppLockerScriptTimeoutSeconds 30
+  $expectedId=if($decision -eq 'Allowed'){8005}else{8006}
+  if($probe.ExitCode -or $probe.Status -cne 'NativeScriptEventObserved' -or $probe.EventId -ne $expectedId){throw ($probe|ConvertTo-Json -Depth 32)}
+  if($probe.ReadyRuleCredit -ne 0 -or $probe.PolicyChanges -ne 0){throw 'Unsupported policy/credit claim.'}
+  foreach($artifact in $probe.Artifacts){if((Get-FileHash (Join-Path $probe.OutputPath $artifact.Name)).Hash.ToLowerInvariant() -cne $artifact.Sha256){throw 'Artifact hash mismatch'}}
+  Write-Host "Native AppLocker $expectedId observed via public CLI under PowerShell $($PSVersionTable.PSVersion), build $($probe.Before.Host.Build). Zero Sigma credit."
+ }
+
+} catch {
+ $primary=$_;Write-Host $_
+ Get-ChildItem -LiteralPath $root -Recurse -Filter 'candidate-*.xml'|ForEach-Object {Write-Host ([IO.File]::ReadAllText($_.FullName))}
+ # Read-only diagnostic independent of the production XPath filter and parser.
+ try {
+  $recent=@(Get-WinEvent -LogName 'Microsoft-Windows-AppLocker/MSI and Script' -MaxEvents 12 -ErrorAction Stop)
+  try {foreach($record in $recent){Write-Host ('Recent native channel XML: '+$record.ToXml())}} finally {foreach($record in $recent){$record.Dispose()}}
+ } catch {Write-Host ('Recent native channel read: '+$_.Exception.Message)}
+ Get-CimInstance Win32_SystemDriver -Filter "Name='AppID'" | Select-Object Name,State,StartMode | ConvertTo-Json | Write-Host
+ try {Get-ScheduledTask -TaskPath '\Microsoft\Windows\AppID\' -ErrorAction Stop | Select-Object TaskName,State | ConvertTo-Json | Write-Host}catch{Write-Host ('AppID task read: '+$_.Exception.Message)}
+ try {$nativeLog=[Diagnostics.Eventing.Reader.EventLogConfiguration]::new('Microsoft-Windows-AppLocker/MSI and Script');try{$nativeLog | Select-Object IsEnabled,LogType,ProviderLevel,ProviderKeywords,LogIsolation | ConvertTo-Json | Write-Host}finally{$nativeLog.Dispose()}}catch{Write-Host ('Channel metadata read: '+$_.Exception.Message)}
+ Write-Host ((Get-WelaAppLockerPolicySnapshot Effective) | ConvertTo-Json -Depth 12)
+}
+finally {
+ if($touched){
+  try {Stop-DisposablePolicyConverter}catch{$cleanup+=$_.Exception.Message}
+  try {Set-AppLockerPolicy -XmlPolicy $backup -ErrorAction Stop;Refresh-DisposableComputerPolicy;if($converterChanged -or -not $converterDisabled){Run-DisposablePolicyConverter};$restored=Get-WelaAppLockerPolicySnapshot Local;if($restored.Status -ne 'Observed' -or (Get-WelaAppLockerXmlKey $restored.Policy.Xml) -cne (Get-WelaAppLockerXmlKey $before.LocalPolicy.Policy.Xml)){throw 'Local policy restoration differs'};$effectiveRestored=Get-WelaAppLockerPolicySnapshot Effective;if($effectiveRestored.Status -ne 'Observed' -or (Get-WelaAppLockerXmlKey $effectiveRestored.Policy.Xml) -cne (Get-WelaAppLockerXmlKey $before.EffectiveGpPolicy.Policy.Xml)){throw 'Effective GP policy restoration differs'}}catch{$cleanup+=$_.Exception.Message}
+  try {Stop-DisposablePolicyConverter;if($converterChanged){$null=Disable-ScheduledTask -TaskPath '\Microsoft\Windows\AppID\' -TaskName 'PolicyConverter' -ErrorAction Stop};$taskAfter=Get-ScheduledTask -TaskPath '\Microsoft\Windows\AppID\' -TaskName 'PolicyConverter' -ErrorAction Stop;if($taskAfter.State -ne $(if($converterDisabled){'Disabled'}else{'Ready'}) -or (Export-ScheduledTask -InputObject $taskAfter -ErrorAction Stop) -cne $converterBefore){throw 'Native PolicyConverter task definition was not restored'}}catch{$cleanup+=$_.Exception.Message}
+  try {$log.IsEnabled=$enabled;$log.SaveChanges();$verify=[Diagnostics.Eventing.Reader.EventLogConfiguration]::new($log.LogName);try{if($verify.IsEnabled -ne $enabled){throw 'Channel restoration differs'}}finally{$verify.Dispose()}}catch{$cleanup+=$_.Exception.Message}
+  if($before.Service.State -ne 'Running') {try {Stop-Service AppIDSvc -ErrorAction Stop}catch{Write-Host 'Protected AppIDSvc could not stop; startup mode was untouched. The disposable hosted VM is discarded after this job.'}}
+  $afterService=Get-WelaAppLockerService;if($afterService.StartMode -ne $before.Service.StartMode){$cleanup+='AppIDSvc startup mode changed'}
+ }
+ $log.Dispose()
+}
+if($cleanup.Count){throw ('Native cleanup failed: '+($cleanup -join '; '))}
+if($primary){throw $primary}
+$cleanupReceipt=[pscustomobject]@{Head=$env:GITHUB_SHA;Engine=[string]$PSVersionTable.PSVersion;PolicyRestored=$true;ChannelRestored=$true;TaskRestored=$true;ServiceBefore=$before.Service;ServiceAfter=(Get-WelaAppLockerService);ServiceStateRestored=($before.Service.State -ceq (Get-WelaAppLockerService).State);ServiceStartupPreserved=($before.Service.StartMode -ceq (Get-WelaAppLockerService).StartMode);ProtectedServiceBoundary='If AppIDSvc refuses Stop, its running state is left for disposable VM teardown; no full service-state rollback claim.'}
+[IO.File]::WriteAllText((Join-Path $root 'cleanup.json'),($cleanupReceipt|ConvertTo-Json -Depth 8))
+Write-Host 'Original local/effective GP policy, channel enablement and converter task restored; service startup mode preserved.' 
+$global:LASTEXITCODE=0

From ef64b08bd2cb33b932f3dc59db394f8d8582520c Mon Sep 17 00:00:00 2001
From: Shirofune-Security
 <43838376+Shirofune-Security@users.noreply.github.com>
Date: Mon, 21 Sep 2026 22:26:34 +0900
Subject: [PATCH 2/5] Document Script evidence boundaries and retain bounded
 startup diagnostics

---
 .github/workflows/release.yml          |  2 +-
 CHANGELOG-Japanese.md                  |  2 ++
 CHANGELOG.md                           |  2 ++
 docs/applocker-probe.md                |  2 +-
 docs/applocker-script-probe.md         | 33 ++++++++++++++++++++++++++
 scripts/AppLockerScriptProbe.ps1       | 10 +++++---
 website/docs/resources/changelog.ja.md |  2 ++
 website/docs/resources/changelog.md    |  2 ++
 8 files changed, 50 insertions(+), 5 deletions(-)
 create mode 100644 docs/applocker-script-probe.md

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c74297b3..472b3159 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -41,7 +41,7 @@ jobs:
           Copy-Item -Recurse -Path ./scripts -Destination release-binaries/
           Copy-Item -Recurse -Path ./modules -Destination release-binaries/
           New-Item -ItemType Directory -Path release-binaries/docs -Force | Out-Null
-          Copy-Item -Path ./docs/gpo-audit-packages.md, ./docs/gpo-package-deployment.md, ./docs/gpo-creation.md, ./docs/wmi-probe.md, ./docs/smb-runtime-activation.md, ./docs/smb-auditing.md, ./docs/wec-state.md, ./docs/wec-update.md, ./docs/wec-runtime.md, ./docs/wef-deployment.md, ./docs/native-channel-access.md, ./docs/eventlog-settings.md, ./docs/channel-read.md, ./docs/native-rule-eligibility.md, ./docs/native-validation.md, ./docs/wef-arrival.md, ./docs/ipsec-prerequisites.md, ./docs/wec-ingress.md -Destination release-binaries/docs/
+          Copy-Item -Path ./docs/applocker-script-probe.md, ./docs/applocker-probe.md, ./docs/gpo-audit-packages.md, ./docs/gpo-package-deployment.md, ./docs/gpo-creation.md, ./docs/wmi-probe.md, ./docs/smb-runtime-activation.md, ./docs/smb-auditing.md, ./docs/wec-state.md, ./docs/wec-update.md, ./docs/wec-runtime.md, ./docs/wef-deployment.md, ./docs/native-channel-access.md, ./docs/eventlog-settings.md, ./docs/channel-read.md, ./docs/native-rule-eligibility.md, ./docs/native-validation.md, ./docs/wef-arrival.md, ./docs/ipsec-prerequisites.md, ./docs/wec-ingress.md -Destination release-binaries/docs/
 
       - name: Set Artifact Name
         if: contains(matrix.info.os, 'windows') == true
diff --git a/CHANGELOG-Japanese.md b/CHANGELOG-Japanese.md
index c85e4a21..9ba629c1 100644
--- a/CHANGELOG-Japanese.md
+++ b/CHANGELOG-Japanese.md
@@ -4,6 +4,8 @@
 
 **改善:**
 
+- 既存の Script AuditOnly ポリシーに対し、固定の Windows PowerShell5.1 スクリプトを実行する `applocker-script-probe` を追加しました。実行者と子プロセスのログオン、保持したファイル、高精度 UTC とイベント記録境界を確認し、Script8005 の許可と8006 の監査専用ブロック判定を区別します。拒否・上限・重複・状態変化は未検証とし、設定変更や Sigma の評価加算は行いません。使い捨て Windows の4構成で両イベントとポリシー・チャネル・タスクの復元を検証し、保護された AppIDSvc を停止できない場合は明記します。 (関連 #381) (@Shirofune-Security)
+
 - `wec-ingress` の Plan/Apply を追加し、明示した IPv4 範囲から Domain プロファイルの TCP5985 を許可する新規ルールを作成します。実ホスト・ログオン・プロファイル・コードと計画ハッシュ、変更前の永続記録、両ストアとフィルターの読戻しで変更や既存名を拒否します。既存の収集サーバー前提条件も、範囲を広げずに同等のIPv4ネットマスク表記・IPv6表記を照合します。使い捨て Windows テストは作成・名前衝突・再実行拒否・既存前提条件との連携・削除を検証し、リスナー・配送・Sigma の証明は加算しません。 (@Shirofune-Security)
 
 - `smb-runtime` を追加し、Windows 標準の SMB 監査スイッチ6個を明示的に有効化します。モジュール・ビルド・ADMX、型付きポリシーの競合、設定全体の変化を確認し、各変更の意図と確認結果を永続的に記録します。署名・暗号化・ゲスト接続・サービス設定を保持し、現在の有効化とイベント・永続性・Sigma の証明を区別します。使い捨て Server 2025 の有効化と復元、Server 2022 の拒否を PowerShell 5.1/7 で検証します。 (#441) (@Shirofune-Security)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2933c992..e1d6184b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 **Improvements:**
 
+- Added opt-in `applocker-script-probe` for a fixed native Windows PowerShell5.1 script under an existing Script AuditOnly policy. Actual caller/child logon context, held file bytes, precise UTC and native record boundaries distinguish exact Script8005 allowed and8006 would-block events; denied, capped, ambiguous or drifted runs remain unverified. The disposable four-way Windows suite requires both native decisions and policy/channel/task cleanup, with the protected-AppIDSvc stopping boundary recorded. No configuration changes or Sigma credit. (Related #381) (@Shirofune-Security)
+
 - Added explicit `wec-ingress` Plan/Apply for one new, narrowly scoped Domain TCP5985 collector firewall rule. Actual host/logon/profile/source guards, reviewed hashes, flushed pending evidence and both-store/filter readback refuse drift and existing names; partial creation remains explicit. The existing collector prerequisite recognizes equivalent native dotted netmasks and IPv6 spellings without broadening accepted scopes. Disposable native tests cover creation, collision, replay, collector integration and cleanup without listener, delivery or Sigma claims. (@Shirofune-Security)
 
 - Added explicit `smb-runtime` activation of six native SMB audit switches, with reviewed module/build/ADMX capabilities, typed policy conflicts, complete configuration drift guards and durable per-switch receipts. Signing, encryption, guest access and service settings are preserved; runtime verification stays separate from events, persistence and Sigma credit. Disposable Server 2025 activation/restoration and Server 2022 refusal tests cover PowerShell 5.1/7. (#441) (@Shirofune-Security)
diff --git a/docs/applocker-probe.md b/docs/applocker-probe.md
index ef99242f..431d5174 100644
--- a/docs/applocker-probe.md
+++ b/docs/applocker-probe.md
@@ -13,7 +13,7 @@ Run copies native System32 `cmd.exe` into the protected output directory with a
 
 A bounded query requires exactly one native AppLocker 8002 (allowed) or 8003 (allowed, would block under enforcement) with the expected provider, version, computer, EXE collection, actual user SID, owned process ID, exact file path and time window. The report retains the distinct event ID; 8002 does not demonstrate a would-block decision. Policy, service, channel, reader, host and executable bytes are checked before and after. Denied, absent, capped, duplicate or drifted results fail with a retained diagnostic. Component hashes establish consistency, not authenticity or a signature.
 
-`NativeExeEventObserved` proves only this event in this local channel at this time. It grants **zero Sigma readiness credit**. Scripts, MSI, DLL, packaged applications, forwarding, translated queries and backend matches require separate evidence. Client builds and managed/CSP deployments require lab acceptance beyond hosted-server CI.
+`NativeExeEventObserved` proves only this event in this local channel at this time. It grants **zero Sigma readiness credit**. The [separate Script probe](applocker-script-probe.md) collects Windows PowerShell5.1 Script8005/8006 evidence. MSI, DLL, packaged applications, forwarding, translated queries and backend matches require separate evidence. Client builds and managed/CSP deployments require lab acceptance beyond hosted-server CI.
 
 The Windows test explicitly opts into temporary changes on disposable GitHub-hosted Server 2022/2025 VMs under Windows PowerShell 5.1 and PowerShell 7. It accepts only a non-domain host with initially empty, understood local/effective GP policies, prepares one AuditOnly policy through the native cmdlet in the test fixture, temporarily enables/runs the existing verified native PolicyConverter task when disabled, runs a bounded computer Group Policy refresh and requires native 8001 policy-application evidence followed by a real 8003. Hosted images can contain enrollment/provider keys; these are recorded and preserved, and CSP policy remains Unknown. This fixture tests the probe, not production importer acceptance: the production importer continues to block observed management entries. It restores and refreshes the original local policy, verifies both local and effective GP snapshots, and restores channel enablement and the exact PolicyConverter task definition/enabled setting with no task invocation left running or queued, and leaves service startup mode untouched. If Windows refuses to stop its protected AppIDSvc, the test records that running-state boundary and relies on disposal of the VM; it does not claim service-state rollback. Never run that fixture on a production host.
 
diff --git a/docs/applocker-script-probe.md b/docs/applocker-script-probe.md
new file mode 100644
index 00000000..33311d7d
--- /dev/null
+++ b/docs/applocker-script-probe.md
@@ -0,0 +1,33 @@
+# Native AppLocker Script probe
+
+Related to #381. `applocker-script-probe` runs one fixed, locally generated `.ps1` file through native 64-bit Windows PowerShell 5.1 and looks for its actual AppLocker Script-collection decision. WELA itself can run in Windows PowerShell 5.1 or PowerShell 7. This command adds no AppLocker policy, starts no service, changes no execution policy or channel, and grants no Sigma readiness credit. Sysmon is out of scope.
+
+```powershell
+.\WELA.ps1 applocker-script-probe
+.\WELA.ps1 applocker-script-probe -AppLockerScriptAction Run -AppLockerScriptOutputPath C:\Evidence\new-script-probe -AppLockerScriptTimeoutSeconds 30
+```
+
+Plan reads prerequisites without launching a child or writing files. Run requires a new private directory on a local fixed drive, with an existing parent. Only reviewed Windows 11 builds and Server 2022/2025 member hosts are accepted; domain controllers are excluded. Client and managed-environment acceptance remains separate from hosted-server CI.
+
+The effective Group Policy Script collection must already contain rules in `AuditOnly` mode. Local and effective GP policy, management observations, AppIDSvc state and MSI and Script channel configuration must be readable. AppIDSvc must already run and the channel must already be enabled. AppLocker CSP policy remains **Unknown**: the native GP cmdlets do not enumerate that authority. Existing enforcement in other collections is preserved and can prevent the fixed native host from starting.
+
+Run creates only the reviewed worker template with a fresh filename and nonce. It launches System32's `WindowsPowerShell\v1.0\powershell.exe` with `-NoLogo -NoProfile -NonInteractive -File`; there is no operator-supplied command, profile loading or execution-policy override. The existing execution policy must permit that locally generated unsigned file. For example, Restricted or AllSigned may prevent completion; that is an unverified result. The report records existing native execution-policy registry values and the inherited process preference, without equating these observations to all application-control authorities.
+
+The worker emits its fixed ready marker, actual Windows PowerShell 5.1 version and language mode, waits for its fixed release marker, emits completion and exits. Before releasing it, WELA observes the real child primary token and compares its user, logon LUID, group attributes and privilege attributes with the actual current caller. Impersonated or restricted callers are refused. Caller token identity and modification state are checked throughout child execution and event queries. Metadata and output preparation precede that interval; final configuration observations are checked separately.
+
+Native PowerShell and generated script files are held read-locked during execution, with SHA256 and volume/file identity checks. Source fingerprints bind the compiled helper to its exact source bytes and are rechecked before launch and after collection. These are consistency observations, not a signature or protection from a local administrator. The generated file is retained with the evidence.
+
+The query starts from an actual current record boundary in `Microsoft-Windows-AppLocker/MSI and Script`. A match requires the reviewed provider GUID, event version, channel, computer, Script collection, actual user SID, child PID, exact unique script path and a native precise-UTC timestamp within the actual process interval. It accepts exactly one of these separate outcomes:
+
+| Event | Report decision | Meaning |
+|---|---|---|
+| 8005 | `Allowed` | A Script rule allowed this file. |
+| 8006 | `AllowedWouldBlockIfEnforced` | The audit-only Script policy would block this file if enforced. |
+
+8005 does not prove a would-block decision. 8007, MSI events sharing the channel, other processes, older records, stale paths, duplicates, unknown versions and timestamps outside the exact interval are rejected. Missing, denied, incomplete, capped or drifted results remain `Unverified` with a nonzero exit code. The bounded query refuses its 256-event or one-MiB cap; only matched XML or at most four candidates containing the owned filename are exported. Child startup is bounded to thirty seconds, completion to ten seconds after release, output drain to five seconds and event polling to the selected 1–30 seconds; individual native event reads have finite timeouts. Owned child termination is attempted and checked on failure. Raw process output is bounded.
+
+`NativeScriptEventObserved` means only that this one local Windows PowerShell 5.1 script generated the retained event under the observed context. It does not prove PowerShell 7 script behavior, other Script formats, MSI/DLL/packaged-app coverage, enforcement behavior, forwarding or backend rule matches. The [separate EXE probe](applocker-probe.md) covers EXE events.
+
+The dedicated Windows workflow requires explicit opt-in on disposable non-domain GitHub-hosted Server 2022/2025 VMs, each under both WELA host engines. It requires initially empty and understood local/effective GP policies. The fixture prepares one Script AuditOnly policy at a time, invokes the verified native PolicyConverter task and a bounded computer-policy refresh, then requires genuine public-command 8006 and 8005 records, source/receipt hashes and unchanged product context. Mocked fixtures never substitute for those events. It restores original local/effective GP policy, channel enablement and the exact PolicyConverter task definition/enabled state and preserves service startup mode. If Windows refuses to stop protected AppIDSvc, the cleanup receipt explicitly records the remaining running state and relies on disposal of that VM; it does not claim full service-state restoration. This fixture must not be run on production hosts.
+
+Microsoft references: [Script rule formats and host enforcement semantics](https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/applocker/script-rules-in-applocker), [AppLocker event IDs](https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/applocker/using-event-viewer-with-applocker), [native policy refresh and verification](https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/applocker/refresh-an-applocker-policy), [Application Identity service](https://learn.microsoft.com/en-us/windows/security/application-security/application-control/app-control-for-business/applocker/configure-the-application-identity-service).
diff --git a/scripts/AppLockerScriptProbe.ps1 b/scripts/AppLockerScriptProbe.ps1
index 2925b0fa..6b03283b 100644
--- a/scripts/AppLockerScriptProbe.ps1
+++ b/scripts/AppLockerScriptProbe.ps1
@@ -86,7 +86,7 @@ function Start-WelaAppLockerScriptProcess {
     $template=[IO.File]::ReadAllText((Join-Path $script:ScriptRoot 'scripts/AppLockerScriptWorker.ps1'))
     $scriptBytes=[Text.UTF8Encoding]::new($false).GetBytes((New-WelaAppLockerScriptText $template $nonce))
     $artifact=Write-WelaArrivalArtifact $Root ([IO.Path]::GetFileName($path)) ([Text.UTF8Encoding]::new($false).GetString($scriptBytes))
-    $source=$null;$scriptFile=$null;$process=$null;$started=$false
+    $source=$null;$scriptFile=$null;$process=$null;$started=$false;$stderr=$null
     try {
         $source=[IO.File]::Open($State.Source,[IO.FileMode]::Open,[IO.FileAccess]::Read,[IO.FileShare]::Read)
         $scriptFile=[IO.File]::Open($path,[IO.FileMode]::Open,[IO.FileAccess]::Read,[IO.FileShare]::Read)
@@ -115,9 +115,13 @@ function Start-WelaAppLockerScriptProcess {
         if($process.ExitCode -ne 0 -or $out.TrimEnd("`r","`n") -cne ('WELA_SCRIPT_COMPLETE_'+$nonce) -or $err){throw ('The fixed script did not complete correctly. Exit='+$process.ExitCode+' Error='+$err)}
         if((Get-WelaAppLockerScriptKey ((Get-WelaAppLockerScriptReader))) -cne $readerKey -or [Wela.AppLockerScript.Native]::FileId($source.SafeFileHandle.DangerousGetHandle()) -cne $sourceId -or [Wela.AppLockerScript.Native]::FileId($scriptFile.SafeFileHandle.DangerousGetHandle()) -cne $scriptId){throw 'Reader or held file identity changed during script execution.'}
         [pscustomobject][ordered]@{ProcessId=$process.Id;UserSid=$Reader.Sid;ChildToken=$child;NativePowerShell=$State.Source;NativePowerShellSha256=$State.SourceHash;NativePowerShellFileId=$sourceId;ScriptPath=$path;ScriptSha256=$artifact.Sha256;ScriptFileId=$scriptId;ScriptArtifact=$artifact;Nonce=$nonce;Arguments=$info.Arguments;StartedUtc=$start.ToString('o');CompletedUtc=$end.ToString('o');Clock='GetSystemTimePreciseAsFileTime';Ready=$line;Marker=$out.TrimEnd("`r","`n");ExitCode=$process.ExitCode}
+    }catch{
+        $message=$_.Exception.Message
+        if($stderr -and $stderr.Status -eq [Threading.Tasks.TaskStatus]::RanToCompletion){$message+=' Native stderr: '+$stderr.GetAwaiter().GetResult()}
+        throw $message
     }finally{
-        if($process){try{if($started -and -not $process.HasExited){$process.Kill();if(-not $process.WaitForExit(5000)){throw 'Owned script process termination is unconfirmed.'}}}finally{$process.Dispose()}}
-        if($scriptFile){$scriptFile.Dispose()};if($source){$source.Dispose()}
+        try{if($process){try{if($started -and -not $process.HasExited){$process.Kill();if(-not $process.WaitForExit(5000)){throw 'Owned script process termination is unconfirmed.'}}}finally{$process.Dispose()}}}
+        finally{if($scriptFile){$scriptFile.Dispose()};if($source){$source.Dispose()}}
     }
 }
 function Read-WelaAppLockerScriptEvents {
diff --git a/website/docs/resources/changelog.ja.md b/website/docs/resources/changelog.ja.md
index 0857b29e..fad42c8a 100644
--- a/website/docs/resources/changelog.ja.md
+++ b/website/docs/resources/changelog.ja.md
@@ -7,6 +7,8 @@
 
 **改善:**
 
+- 既存の Script AuditOnly ポリシーに対し、固定の Windows PowerShell5.1 スクリプトを実行する `applocker-script-probe` を追加しました。実行者と子プロセスのログオン、保持したファイル、高精度 UTC とイベント記録境界を確認し、Script8005 の許可と8006 の監査専用ブロック判定を区別します。拒否・上限・重複・状態変化は未検証とし、設定変更や Sigma の評価加算は行いません。使い捨て Windows の4構成で両イベントとポリシー・チャネル・タスクの復元を検証し、保護された AppIDSvc を停止できない場合は明記します。 (関連 #381) (@Shirofune-Security)
+
 - `wec-ingress` の Plan/Apply を追加し、明示した IPv4 範囲から Domain プロファイルの TCP5985 を許可する新規ルールを作成します。実ホスト・ログオン・プロファイル・コードと計画ハッシュ、変更前の永続記録、両ストアとフィルターの読戻しで変更や既存名を拒否します。既存の収集サーバー前提条件も、範囲を広げずに同等のIPv4ネットマスク表記・IPv6表記を照合します。使い捨て Windows テストは作成・名前衝突・再実行拒否・既存前提条件との連携・削除を検証し、リスナー・配送・Sigma の証明は加算しません。 (@Shirofune-Security)
 
 - `smb-runtime` を追加し、Windows 標準の SMB 監査スイッチ6個を明示的に有効化します。モジュール・ビルド・ADMX、型付きポリシーの競合、設定全体の変化を確認し、各変更の意図と確認結果を永続的に記録します。署名・暗号化・ゲスト接続・サービス設定を保持し、現在の有効化とイベント・永続性・Sigma の証明を区別します。使い捨て Server 2025 の有効化と復元、Server 2022 の拒否を PowerShell 5.1/7 で検証します。 (#441) (@Shirofune-Security)
diff --git a/website/docs/resources/changelog.md b/website/docs/resources/changelog.md
index a4d80dc1..da5c9d15 100644
--- a/website/docs/resources/changelog.md
+++ b/website/docs/resources/changelog.md
@@ -7,6 +7,8 @@
 
 **Improvements:**
 
+- Added opt-in `applocker-script-probe` for a fixed native Windows PowerShell5.1 script under an existing Script AuditOnly policy. Actual caller/child logon context, held file bytes, precise UTC and native record boundaries distinguish exact Script8005 allowed and8006 would-block events; denied, capped, ambiguous or drifted runs remain unverified. The disposable four-way Windows suite requires both native decisions and policy/channel/task cleanup, with the protected-AppIDSvc stopping boundary recorded. No configuration changes or Sigma credit. (Related #381) (@Shirofune-Security)
+
 - Added explicit `wec-ingress` Plan/Apply for one new, narrowly scoped Domain TCP5985 collector firewall rule. Actual host/logon/profile/source guards, reviewed hashes, flushed pending evidence and both-store/filter readback refuse drift and existing names; partial creation remains explicit. The existing collector prerequisite recognizes equivalent native dotted netmasks and IPv6 spellings without broadening accepted scopes. Disposable native tests cover creation, collision, replay, collector integration and cleanup without listener, delivery or Sigma claims. (@Shirofune-Security)
 
 - Added explicit `smb-runtime` activation of six native SMB audit switches, with reviewed module/build/ADMX capabilities, typed policy conflicts, complete configuration drift guards and durable per-switch receipts. Signing, encryption, guest access and service settings are preserved; runtime verification stays separate from events, persistence and Sigma credit. Disposable Server 2025 activation/restoration and Server 2022 refusal tests cover PowerShell 5.1/7. (#441) (@Shirofune-Security)

From bfbdc6c476f867b7a89b3478b5542423645c5475 Mon Sep 17 00:00:00 2001
From: Shirofune-Security
 <43838376+Shirofune-Security@users.noreply.github.com>
Date: Mon, 21 Sep 2026 22:29:03 +0900
Subject: [PATCH 3/5] Read the owned release pipe with encoding-preamble
 detection

---
 scripts/AppLockerScriptWorker.ps1 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/AppLockerScriptWorker.ps1 b/scripts/AppLockerScriptWorker.ps1
index 2ebb46fe..4f7be74b 100644
--- a/scripts/AppLockerScriptWorker.ps1
+++ b/scripts/AppLockerScriptWorker.ps1
@@ -1,7 +1,10 @@
 # Fixed locally generated script; no external inputs or configuration writes.
 $ErrorActionPreference = 'Stop'
 [Console]::Out.WriteLine(('WELA_SCRIPT_READY___WELA_SCRIPT_NONCE__|' + $ExecutionContext.SessionState.LanguageMode + '|' + $PSVersionTable.PSVersion))
-$release = [Console]::In.ReadLine()
+# .NET Framework's redirected-input writer may emit an encoding preamble.
+# Read the owned pipe through a BOM-aware reader, without changing console state.
+$pipeReader = [IO.StreamReader]::new([Console]::OpenStandardInput(), [Text.UTF8Encoding]::new($false, $true), $true, 128, $true)
+try { $release = $pipeReader.ReadLine() } finally { $pipeReader.Dispose() }
 if ($release -cne 'WELA_SCRIPT_GO___WELA_SCRIPT_NONCE__') { exit 17 }
 [Console]::Out.WriteLine('WELA_SCRIPT_COMPLETE___WELA_SCRIPT_NONCE__')
 exit 0

From 37e93e10ebc52d8a289ac4173eccd78ed277a539 Mon Sep 17 00:00:00 2001
From: Shirofune-Security
 <43838376+Shirofune-Security@users.noreply.github.com>
Date: Mon, 21 Sep 2026 22:34:09 +0900
Subject: [PATCH 4/5] Refuse stopped service dependencies before AppLocker CIM
 observation

---
 docs/applocker-script-probe.md       |  2 +-
 scripts/AppLockerScriptProbe.ps1     | 19 +++++++++++++++++--
 tests/AppLockerScriptProbe.Tests.ps1 | 21 ++++++++++++++++++++-
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/docs/applocker-script-probe.md b/docs/applocker-script-probe.md
index 33311d7d..ab3ddf09 100644
--- a/docs/applocker-script-probe.md
+++ b/docs/applocker-script-probe.md
@@ -9,7 +9,7 @@ Related to #381. `applocker-script-probe` runs one fixed, locally generated `.ps
 
 Plan reads prerequisites without launching a child or writing files. Run requires a new private directory on a local fixed drive, with an existing parent. Only reviewed Windows 11 builds and Server 2022/2025 member hosts are accepted; domain controllers are excluded. Client and managed-environment acceptance remains separate from hosted-server CI.
 
-The effective Group Policy Script collection must already contain rules in `AuditOnly` mode. Local and effective GP policy, management observations, AppIDSvc state and MSI and Script channel configuration must be readable. AppIDSvc must already run and the channel must already be enabled. AppLocker CSP policy remains **Unknown**: the native GP cmdlets do not enumerate that authority. Existing enforcement in other collections is preserved and can prevent the fixed native host from starting.
+The effective Group Policy Script collection must already contain rules in `AuditOnly` mode. Local and effective GP policy, management observations, AppIDSvc state and MSI and Script channel configuration must be readable. Direct service observations require Winmgmt, EventLog and AppIDSvc to be running before any CIM connection; the channel must already be enabled. AppLocker CSP policy remains **Unknown**: the native GP cmdlets do not enumerate that authority. Existing enforcement in other collections is preserved and can prevent the fixed native host from starting.
 
 Run creates only the reviewed worker template with a fresh filename and nonce. It launches System32's `WindowsPowerShell\v1.0\powershell.exe` with `-NoLogo -NoProfile -NonInteractive -File`; there is no operator-supplied command, profile loading or execution-policy override. The existing execution policy must permit that locally generated unsigned file. For example, Restricted or AllSigned may prevent completion; that is an unverified result. The report records existing native execution-policy registry values and the inherited process preference, without equating these observations to all application-control authorities.
 
diff --git a/scripts/AppLockerScriptProbe.ps1 b/scripts/AppLockerScriptProbe.ps1
index 6b03283b..a12953b2 100644
--- a/scripts/AppLockerScriptProbe.ps1
+++ b/scripts/AppLockerScriptProbe.ps1
@@ -36,7 +36,19 @@ function Get-WelaAppLockerScriptExecutionPolicy {
     }
     [pscustomobject]$values
 }
+function Get-WelaAppLockerScriptServices {
+    # Direct SCM observations precede every CIM connection; observation must not
+    # implicitly start stopped WMI or AppLocker generation dependencies.
+    $rows=@()
+    foreach($name in @('Winmgmt','EventLog','AppIDSvc')) {
+        $service=Get-Service -Name $name -ErrorAction Stop
+        if($null -eq $service -or $service.Name -ine $name -or $service.Status -ne [ServiceProcess.ServiceControllerStatus]::Running){throw ($name+' must already be running; no CIM connection or child was started.')}
+        $rows+=[pscustomobject]@{Name=$name;Status=[string]$service.Status}
+    }
+    $rows
+}
 function Get-WelaAppLockerScriptState {
+    $services=@(Get-WelaAppLockerScriptServices)
     $hostState=Get-WelaAppLockerHost
     $computer=Get-CimInstance Win32_ComputerSystem -ErrorAction Stop
     $version=Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion' -ErrorAction Stop
@@ -44,14 +56,17 @@ function Get-WelaAppLockerScriptState {
     $channel=[Diagnostics.Eventing.Reader.EventLogConfiguration]::new('Microsoft-Windows-AppLocker/MSI and Script')
     try {$log=[ordered]@{Name=$channel.LogName;Enabled=$channel.IsEnabled;SecurityDescriptor=$channel.SecurityDescriptor;MaximumSize=$channel.MaximumSizeInBytes;Mode=[string]$channel.LogMode;LogFilePath=$channel.LogFilePath}}finally{$channel.Dispose()}
     $source=Resolve-WelaArrivalPath (Join-Path ([Environment]::SystemDirectory) 'WindowsPowerShell\v1.0\powershell.exe')
-    [pscustomobject][ordered]@{Host=$hostState;MachineGuid=$machine.MachineGuid;UBR=$version.UBR;Computer=[Environment]::MachineName;Domain=[string]$computer.Domain;LocalPolicy=(Get-WelaAppLockerPolicySnapshot Local);EffectivePolicy=(Get-WelaAppLockerPolicySnapshot Effective);Management=(Get-WelaAppLockerManagement);Service=(Get-WelaAppLockerService);Channel=$log;ExecutionPolicy=(Get-WelaAppLockerScriptExecutionPolicy);Source=$source;SourceHash=(Get-FileHash -LiteralPath $source -Algorithm SHA256 -ErrorAction Stop).Hash.ToLowerInvariant()}
+    [pscustomobject][ordered]@{Services=$services;Host=$hostState;MachineGuid=$machine.MachineGuid;UBR=$version.UBR;Computer=[Environment]::MachineName;Domain=[string]$computer.Domain;LocalPolicy=(Get-WelaAppLockerPolicySnapshot Local);EffectivePolicy=(Get-WelaAppLockerPolicySnapshot Effective);Management=(Get-WelaAppLockerManagement);Service=(Get-WelaAppLockerService);Channel=$log;ExecutionPolicy=(Get-WelaAppLockerScriptExecutionPolicy);Source=$source;SourceHash=(Get-FileHash -LiteralPath $source -Algorithm SHA256 -ErrorAction Stop).Hash.ToLowerInvariant()}
 }
 function Get-WelaAppLockerScriptStateKey {
     param($State)
+    foreach($status in @($State.Host.Status,$State.LocalPolicy.Status,$State.EffectivePolicy.Status,$State.Service.Status,$State.Service.State,$State.Management.Status)){if($status -isnot [string]){throw 'Native context status must be a typed string.'}}
+    $services=@($State.Services)
+    if($services.Count -ne 3 -or @($services|Where-Object{$_.Name -isnot [string] -or $_.Status -isnot [string] -or $_.Status -cne 'Running'}).Count -or (($services.Name -join ',') -cne 'Winmgmt,EventLog,AppIDSvc')){throw 'Complete running-service preflight evidence is required.'}
     if($State.Host.Status -cne 'Candidate' -or $State.Host.Is64BitProcess -isnot [bool] -or -not $State.Host.Is64BitProcess -or $State.Host.ProductType -notin @(1,3) -or ($State.Host.ProductType -eq 1 -and $State.Host.Build -notin @(22000,22621,22631,26100,26200)) -or ($State.Host.ProductType -eq 3 -and $State.Host.Build -notin @(20348,26100))){throw 'A reviewed native Windows 11 or Server 2022/2025 member host is required; DCs are excluded.'}
     foreach($policy in @($State.LocalPolicy,$State.EffectivePolicy)){if($policy.Status -cne 'Observed' -or $policy.Policy.HasUnknownPolicyData -isnot [bool] -or $policy.Policy.HasUnknownPolicyData){throw 'Local and effective GP policy must be readable and understood.'}}
     $collection=@($State.EffectivePolicy.Policy.Collections|Where-Object Type -CEQ 'Script')
-    if($collection.Count -ne 1 -or $collection[0].EnforcementMode -cne 'AuditOnly' -or $collection[0].RuleCount -lt 1){throw 'An existing nonempty effective Script AuditOnly collection is required.'}
+    if($collection.Count -ne 1 -or $collection[0].EnforcementMode -isnot [string] -or $collection[0].EnforcementMode -cne 'AuditOnly' -or ($collection[0].RuleCount -isnot [int] -and $collection[0].RuleCount -isnot [long]) -or $collection[0].RuleCount -lt 1){throw 'An existing nonempty effective Script AuditOnly collection is required.'}
     if($State.Service.Status -cne 'Observed' -or $State.Service.State -cne 'Running'){throw 'AppIDSvc must already be running.'}
     if($State.Channel.Enabled -isnot [bool] -or -not $State.Channel.Enabled -or $State.Channel.Name -cne 'Microsoft-Windows-AppLocker/MSI and Script' -or -not $State.Channel.SecurityDescriptor){throw 'The native MSI and Script channel must already be enabled and readable.'}
     if($State.Management.Status -cne 'Observed' -or $State.SourceHash -cnotmatch '^[a-f0-9]{64}$' -or -not $State.MachineGuid -or -not $State.Computer){throw 'Incomplete management, machine or source observation.'}
diff --git a/tests/AppLockerScriptProbe.Tests.ps1 b/tests/AppLockerScriptProbe.Tests.ps1
index 971e915d..48c4d86d 100644
--- a/tests/AppLockerScriptProbe.Tests.ps1
+++ b/tests/AppLockerScriptProbe.Tests.ps1
@@ -6,10 +6,29 @@ $repo=Split-Path $PSScriptRoot -Parent
 $count=0
 function Assert($Value,$Message){if(-not $Value){throw $Message};$script:count++}
 function Reject([scriptblock]$Action,[string]$Pattern){$message='';try{&$Action|Out-Null}catch{$message=$_.Exception.Message};Assert ($message -match $Pattern) "Expected $Pattern; got $message"}
+# Prove stopped service refusal happens before the actual state reader reaches CIM.
+$script:missingService='';$script:scm=@();$script:cimCalls=0
+function Get-Service {param($Name);$script:scm+=$Name;[pscustomobject]@{Name=$Name;Status=$(if($Name -ceq $script:missingService){[ServiceProcess.ServiceControllerStatus]::Stopped}else{[ServiceProcess.ServiceControllerStatus]::Running})}}
+function Get-WelaAppLockerHost {$script:cimCalls++;throw 'CIM boundary reached after SCM checks'}
+foreach($name in @('Winmgmt','EventLog','AppIDSvc')){
+ $script:missingService=$name;$script:scm=@();$script:cimCalls=0
+ Reject {Get-WelaAppLockerScriptState} ($name+' must already be running')
+ Assert ($script:cimCalls -eq 0) 'Stopped service refusal precedes all CIM observations'
+}
+$script:missingService='';$script:scm=@();$script:cimCalls=0
+Reject {Get-WelaAppLockerScriptState} 'CIM boundary reached after SCM checks'
+Assert (($script:scm -join ',') -ceq 'Winmgmt,EventLog,AppIDSvc' -and $script:cimCalls -eq 1) 'All direct SCM checks precede the first CIM observation'
 $policy='<AppLockerPolicy Version="1"><RuleCollection Type="Script" EnforcementMode="AuditOnly"><FilePathRule Id="12345678-1234-1234-1234-123456789abc" Name="Windows" UserOrGroupSid="S-1-1-0" Action="Allow"><Conditions><FilePathCondition Path="%WINDIR%\*" /></Conditions></FilePathRule></RuleCollection></AppLockerPolicy>'
-$state=[pscustomobject]@{Host=[pscustomobject]@{Status='Candidate';Is64BitProcess=$true;PartOfDomain=$false;ProductType=3;Build=20348};MachineGuid='11111111-1111-1111-1111-111111111111';Management=[pscustomobject]@{Status='Observed'};Computer='TEST';Domain='WORKGROUP';Reader=[pscustomobject]@{Sid='S-1-5-21-1-2-3-1000'};EffectivePolicy=[pscustomobject]@{Status='Observed';Policy=(ConvertFrom-WelaAppLockerXml $policy)};Service=[pscustomobject]@{Status='Observed';State='Running';StartMode='Manual'};Channel=[pscustomobject]@{Name='Microsoft-Windows-AppLocker/MSI and Script';Enabled=$true;SecurityDescriptor='O:SYG:SYD:(A;;0x1;;;SY)'};Source='C:\Windows\System32\cmd.ps1';SourceHash=('a'*64)}
+$state=[pscustomobject]@{Services=@([pscustomobject]@{Name='Winmgmt';Status='Running'},[pscustomobject]@{Name='EventLog';Status='Running'},[pscustomobject]@{Name='AppIDSvc';Status='Running'});Host=[pscustomobject]@{Status='Candidate';Is64BitProcess=$true;PartOfDomain=$false;ProductType=3;Build=20348};MachineGuid='11111111-1111-1111-1111-111111111111';Management=[pscustomobject]@{Status='Observed'};Computer='TEST';Domain='WORKGROUP';Reader=[pscustomobject]@{Sid='S-1-5-21-1-2-3-1000'};EffectivePolicy=[pscustomobject]@{Status='Observed';Policy=(ConvertFrom-WelaAppLockerXml $policy)};Service=[pscustomobject]@{Status='Observed';State='Running';StartMode='Manual'};Channel=[pscustomobject]@{Name='Microsoft-Windows-AppLocker/MSI and Script';Enabled=$true;SecurityDescriptor='O:SYG:SYD:(A;;0x1;;;SY)'};Source='C:\Windows\System32\cmd.ps1';SourceHash=('a'*64)}
 $state|Add-Member NoteProperty LocalPolicy ($state.EffectivePolicy|ConvertTo-Json -Depth 20|ConvertFrom-Json)
 $null=Get-WelaAppLockerScriptStateKey $state;Assert $true 'Valid audit-only prereqs'
+foreach($parent in @('Host','LocalPolicy','EffectivePolicy','Service','Management')){
+ $saved=$state.$parent.Status;$state.$parent.Status=$true
+ Reject {Get-WelaAppLockerScriptStateKey $state} 'typed string'
+ $state.$parent.Status=$saved
+}
+$state.Services[0].Status=$true;Reject {Get-WelaAppLockerScriptStateKey $state} 'preflight';$state.Services[0].Status='Running'
+
 foreach($mode in @('Enabled','NotConfigured')){$state.EffectivePolicy.Policy=ConvertFrom-WelaAppLockerXml ($policy.Replace('AuditOnly',$mode));Reject {Get-WelaAppLockerScriptStateKey $state} 'AuditOnly'}
 $state.EffectivePolicy.Policy=ConvertFrom-WelaAppLockerXml $policy
 $state.Service.State='Stopped';Reject {Get-WelaAppLockerScriptStateKey $state} 'already be running';$state.Service.State='Running'

From eb1b9989a17092d1fbb1345256ad37a1bc4b6a41 Mon Sep 17 00:00:00 2001
From: Shirofune-Security
 <43838376+Shirofune-Security@users.noreply.github.com>
Date: Mon, 21 Sep 2026 22:38:22 +0900
Subject: [PATCH 5/5] Load the service enum for isolated Windows PowerShell
 fixtures

---
 tests/AppLockerScriptProbe.Tests.ps1 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/AppLockerScriptProbe.Tests.ps1 b/tests/AppLockerScriptProbe.Tests.ps1
index 48c4d86d..f05edf4b 100644
--- a/tests/AppLockerScriptProbe.Tests.ps1
+++ b/tests/AppLockerScriptProbe.Tests.ps1
@@ -3,6 +3,8 @@ $repo=Split-Path $PSScriptRoot -Parent
 . "$repo/scripts/AppLockerReadiness.ps1"
 . "$repo/scripts/WefArrival.ps1"
 . "$repo/scripts/AppLockerScriptProbe.ps1"
+# Mocking Get-Service skips the cmdlet's normal .NET Framework assembly load.
+if(-not ('System.ServiceProcess.ServiceControllerStatus' -as [type])){Add-Type -AssemblyName System.ServiceProcess -ErrorAction Stop}
 $count=0
 function Assert($Value,$Message){if(-not $Value){throw $Message};$script:count++}
 function Reject([scriptblock]$Action,[string]$Pattern){$message='';try{&$Action|Out-Null}catch{$message=$_.Exception.Message};Assert ($message -match $Pattern) "Expected $Pattern; got $message"}