Integrate reviewed CLI, channel and native probe changes

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Shirofune-Security committed 2026-09-22 07:25:37 +09:00
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@@ -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.
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# 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. 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.
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).
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.\WELA.ps1 configure -Auto -ResultsPath .\results.json
```
Unknown named options and other arguments left unbound by PowerShell are rejected before command dispatch. This includes unsupported `-WhatIf`, `-Confirm` and misspelled `-DryRun` options, even with `-Auto`. Use each command's `-Help` for its supported preview options; `-DryRun` is accepted only where documented. Valid positional binding and PowerShell's unambiguous parameter abbreviations remain supported.
`WELA.ps1` is a plain PowerShell script and does not accept PowerShell common parameters such as `-ErrorAction`, `-Verbose`, `-WarningAction` or `-InformationAction`. Earlier versions silently ignored those unbound options; they now produce exit code 1 before any command runs, including read-only commands. Remove them from automation wrappers and use WELA's exit code and structured results to check the outcome. The explicitly declared WELA `-Debug` switch remains supported where documented.
Keep the complete WELA directory, including `scripts/Configuration.ps1`. Choose a
recovery path whose parent directory is writable only by the operators who manage
these settings. The backup directory must not already exist. Without `-BackupPath`,
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# One-byte local file access probe
`file-access-probe` checks whether one explicit read of one existing file produces an attributable local Security 4663 event. Plan observes prerequisites without reading file data. Run opens the same selected leaf in a fixed worker, reads exactly one byte once, clears that buffer and retains no file contents. It changes no audit policy, ACL, service, channel setting or file data. A native read can update access metadata and can trigger existing monitoring.
Run elevated in native 64-bit Windows PowerShell 5.1 or PowerShell 7. Select an ordinary, nonempty file on a fixed local drive using its exact absolute DOS path (at most 240 characters). UNC/device input paths, alternate streams, wildcards, reparse components, multiple hard links, EFS, offline/recall files and directories are refused. Targets inside the canonical WELA source tree, the active PowerShell executable and aliases are refused by an initial metadata-only check before implementation/engine hashing. The token must already hold the security privilege needed to inspect the SACL; observation enables that existing privilege only around handle acquisition and restores its prior state before the data read. No privilege is granted and backup semantics are not used.
The File System subcategory must already include Success, `SCENoApplyLegacyAuditPolicy` must be typed DWORD 1, and the enabled Security channel must be readable. One existing ordinary success ReadData audit ACE must apply directly to the user SID or an enabled, non-deny-only group. Inherit-only and conditional/callback ACEs cannot establish this prerequisite. EventLog, Winmgmt and RpcSs must already be running. This command does not install a SACL or repair prerequisites.
```powershell
.\WELA.ps1 file-access-probe -FileProbePath C:\Audit\existing-file.txt
.\WELA.ps1 file-access-probe -FileProbeAction Run `
-FileProbePath C:\Audit\existing-file.txt `
-FileProbeOutputPath C:\Evidence\new-file-probe `
-FileProbeTimeoutSeconds 15
```
Run requires a fresh private evidence directory outside the code tree. Only dedicated options are accepted; no `-Auto`, `-DryRun`, generic `-WhatIf` or extra positional arguments. `FileProbeTimeoutSeconds` accepts 1–30 seconds for polling after the worker; worker execution has a separate 20-second limit. Native query work and cleanup add elapsed time.
The request binds actual host/build/MachineGuid, engine and implementation hashes, token groups and privileges, all effective audit masks, precedence, Security configuration and full selected-file metadata/security. A held existing-file handle prevents concurrent write/delete opens. Volume/file ID, creation and last-write times, size, attributes, link count and full current SDK security descriptor must agree before and after the operation. Both DOS and NT volume names are observed from that same handle and bound to this identity. Path comparison is case-insensitive; other volume names or paths are not inferred or accepted. Some volumes can emit Removable Storage Task 12812 even when `DriveInfo` reports Fixed, as observed on a hosted runner data volume. This probe accepts only File System Task 12800; those other events remain unverified.
Before launch, the parent writes and flushes `before.json` and `intent.json`. The worker inherits the existing execution policy without an override; a blocked worker remains unverified with its prior intent retained. The fixed worker independently rebuilds the request state, verifies its primary token, performs one native `ReadFile` call requesting one byte and returns a receipt with exact PID, handle and precise `StartedUtc`, `ReadReturnedUtc` and `CompletedUtc` timestamps. Its fixed `OneByteReadAndHeldIdentityReadback` phase spans the one read and the existing same-handle identity/security readback; the immediate `ReadFile` return remains separately visible. Times must satisfy start <= read return <= phase completion <= parent observation. No sleep or timestamp padding is added. The parent retains `operation.json`, the original matching `event.xml`, `after.json` and their SHA-256 hashes in `manifest.json`. These artifacts contain file paths, SIDs, security descriptors and audit context, but no target contents or target-content hashes. The manifest is not self-hashed.
Success requires exactly one fresh version-1 Security 4663 from the expected provider, computer, user SID/logon ID, worker PID/executable, native handle, selected DOS or NT path and ReadData mask/access token. Event time must fall within that actual measured read/readback phase, with no padding; it need not fall inside the `ReadFile` call itself. The query stops at 256 events and bounds individual XML size; hitting a cap, missing/duplicate evidence, drift, changed reader context or failed persistence prevents verified success. The final Security record boundary must not move backwards.
`PrerequisitesObserved` (Plan) and `FileReadObserved` (Run) exit 0. `Unverified` exits 1 and explains the observed gap. A stopped or failed worker may already have attempted the read; durable intent alone does not prove completion. An interrupted process may leave only partial evidence, and a manifest-write failure fails outward while earlier receipts remain. Inspect retained artifacts before deciding whether to run another probe in a different fresh directory.
This is evidence for that one current-token local ReadData success. It does not prove Failure auditing, other rights/users/files, child inheritance, forwarded delivery, backend parsing, Sigma readiness or general detection coverage. Security 4663 has no Failure variant. No Sigma/EVTX coverage points are added.
The disposable Windows fixture owns its files in a fresh private system-volume directory and its separate evidence directory, explicitly establishes the test SACL/policy, exercises the public Plan/Run path twice, verifies all artifact hashes and unchanged file content/security, tests missing-SACL/policy and file-replacement refusals, then restores all effective audit masks, typed precedence and token state. It removes only its owned target directory and retains cleanup evidence. Server 2022/2025 and PowerShell 5.1/7 run independently; these fixture changes are not product behavior.
Microsoft references: [4663 event semantics and fields](https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4663), [ReadFile](https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile), and [same-handle DOS/NT path observation](https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfinalpathnamebyhandlew).
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The checked-in inventory maps source query IDs to 12 baseline channels and 8 suspect channels (18 unique combined). Baseline queries 12 (EMET) and 39 (Sysmon) are explicitly excluded. Native-only scope excludes external agents; channel settings do not create subscriptions, add service identities to groups or configure WinRM/collectors. The Microsoft [source prerequisite guidance and sample queries](https://learn.microsoft.com/en-us/windows/security/operating-system-security/device-management/use-windows-event-forwarding-to-assist-in-intrusion-detection) remain a starting point for reviewing role applicability. The report always lists token/group membership, producer configuration, representative event generation and forwarding/ingestion as unverified; required disabled or missing channels remain visible. Other inventoried channels are not automatically enabled.
Safe tests exercise the actual command/JSON/runner with mocked Windows setters. Windows PowerShell 5.1 and PowerShell 7 CI additionally exercise real descriptor serialization and read-only CLI inspection. Release packaging already includes the whole `config`, `modules` and `scripts` directories.
Safe tests exercise the actual command/JSON/runner with mocked Windows setters. Windows PowerShell 5.1 and PowerShell 7 CI also exercise real descriptor serialization and read-only CLI inspection. A separate four-way disposable Server 2022/2025 suite exercises the public Plan, Configure with DryRun, Configure without a reader grant, explicit read-only grant, and repeated idempotent configuration. It verifies exact native descriptor bytes, recovery journal contents, preservation of an existing 2 GiB buffer, all other channel XML fields, and restoration of the original channel settings and all 59 audit masks. Hashed artifacts retain original/configured XML, reports, journal and cleanup evidence.
**Isolated Windows acceptance evidence is still pending; related to issue #367, not sufficient to close it.** On patched Windows 11, member server, DC and ADCS snapshots where the channels exist:
That fixture changes only the three declared channels on explicitly opted-in GitHub-hosted disposable VMs. Restoring the original smaller sizes can discard events generated during the test; it does not restore event records or prove retention duration. It never supplies production forwarding-token access, event generation, collector arrival, policy-refresh persistence or Sigma evidence. Do not run the mutating fixture on ordinary machines. Release packaging already includes the whole `config`, `modules` and `scripts` directories.
**Broader Windows acceptance remains pending; related to issue #367, not sufficient to close it.** Hosted server configuration checks do not cover Windows 11 or domain-specific access and forwarding behavior. On patched Windows 11, member server, DC and ADCS snapshots where the channels exist:
1. Save the plan, channel metadata, descriptor and policy context. Review capacity and the intended forwarding identity. Capture the actual identity/token memberships separately.
2. Apply the opt-in profile, retain the journal/results, then independently read enablement, exact bytes and full SDDL. Compare all original ACEs plus owner/group/SACL/flags and repeat after policy refresh.