title: Accessing WinAPI in PowerShell
author: Nikita Nazarov, oscd.community
date: 2020/10/06
description: Detecting use WinAPI Functions in PowerShell
detection:
    SELECTION_1:
        ScriptBlockText: '*WaitForSingleObject*'
    SELECTION_10:
        ScriptBlockText: '*GetDelegateForFunctionPointer*'
    SELECTION_11:
        ScriptBlockText: '*CreateThread*'
    SELECTION_12:
        ScriptBlockText: '*memcpy*'
    SELECTION_13:
        ScriptBlockText: '*LoadLibrary*'
    SELECTION_14:
        ScriptBlockText: '*GetModuleHandle*'
    SELECTION_15:
        ScriptBlockText: '*GetProcAddress*'
    SELECTION_16:
        ScriptBlockText: '*VirtualProtect*'
    SELECTION_17:
        ScriptBlockText: '*FreeLibrary*'
    SELECTION_18:
        ScriptBlockText: '*ReadProcessMemory*'
    SELECTION_19:
        ScriptBlockText: '*CreateRemoteThread*'
    SELECTION_2:
        ScriptBlockText: '*QueueUserApc*'
    SELECTION_20:
        ScriptBlockText: '*AdjustTokenPrivileges*'
    SELECTION_21:
        ScriptBlockText: '*WriteByte*'
    SELECTION_22:
        ScriptBlockText: '*WriteInt32*'
    SELECTION_23:
        ScriptBlockText: '*OpenThreadToken*'
    SELECTION_24:
        ScriptBlockText: '*PtrToString*'
    SELECTION_25:
        ScriptBlockText: '*FreeHGlobal*'
    SELECTION_26:
        ScriptBlockText: '*ZeroFreeGlobalAllocUnicode*'
    SELECTION_27:
        ScriptBlockText: '*OpenProcessToken*'
    SELECTION_28:
        ScriptBlockText: '*GetTokenInformation*'
    SELECTION_29:
        ScriptBlockText: '*SetThreadToken*'
    SELECTION_3:
        ScriptBlockText: '*RtlCreateUserThread*'
    SELECTION_30:
        ScriptBlockText: '*ImpersonateLoggedOnUser*'
    SELECTION_31:
        ScriptBlockText: '*RevertToSelf*'
    SELECTION_32:
        ScriptBlockText: '*GetLogonSessionData*'
    SELECTION_33:
        ScriptBlockText: '*CreateProcessWithToken*'
    SELECTION_34:
        ScriptBlockText: '*DuplicateTokenEx*'
    SELECTION_35:
        ScriptBlockText: '*OpenWindowStation*'
    SELECTION_36:
        ScriptBlockText: '*OpenDesktop*'
    SELECTION_37:
        ScriptBlockText: '*MiniDumpWriteDump*'
    SELECTION_38:
        ScriptBlockText: '*AddSecurityPackage*'
    SELECTION_39:
        ScriptBlockText: '*EnumerateSecurityPackages*'
    SELECTION_4:
        ScriptBlockText: '*OpenProcess*'
    SELECTION_40:
        ScriptBlockText: '*GetProcessHandle*'
    SELECTION_41:
        ScriptBlockText: '*DangerousGetHandle*'
    SELECTION_42:
        ScriptBlockText: '*kernel32*'
    SELECTION_43:
        ScriptBlockText: '*Advapi32*'
    SELECTION_44:
        ScriptBlockText: '*msvcrt*'
    SELECTION_45:
        ScriptBlockText: '*ntdll*'
    SELECTION_46:
        ScriptBlockText: '*user32*'
    SELECTION_47:
        ScriptBlockText: '*secur32*'
    SELECTION_5:
        ScriptBlockText: '*VirtualAlloc*'
    SELECTION_6:
        ScriptBlockText: '*VirtualFree*'
    SELECTION_7:
        ScriptBlockText: '*WriteProcessMemory*'
    SELECTION_8:
        ScriptBlockText: '*CreateUserThread*'
    SELECTION_9:
        ScriptBlockText: '*CloseHandle*'
    condition: (SELECTION_1 or SELECTION_2 or SELECTION_3 or SELECTION_4 or SELECTION_5
        or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9 or SELECTION_10
        or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14 or SELECTION_15
        or SELECTION_16 or SELECTION_17 or SELECTION_18 or SELECTION_19 or SELECTION_20
        or SELECTION_21 or SELECTION_22 or SELECTION_23 or SELECTION_24 or SELECTION_25
        or SELECTION_26 or SELECTION_27 or SELECTION_28 or SELECTION_29 or SELECTION_30
        or SELECTION_31 or SELECTION_32 or SELECTION_33 or SELECTION_34 or SELECTION_35
        or SELECTION_36 or SELECTION_37 or SELECTION_38 or SELECTION_39 or SELECTION_40
        or SELECTION_41 or SELECTION_42 or SELECTION_43 or SELECTION_44 or SELECTION_45
        or SELECTION_46 or SELECTION_47)
falsepositives:
- Carbon PowerShell Module (https://github.com/webmd-health-services/Carbon)
id: 03d83090-8cba-44a0-b02f-0b756a050306
level: high
logsource:
    category: ps_script
    definition: Script block logging must be enabled
    product: windows
modified: 2021/10/16
references:
- https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse
status: experimental
tags:
- attack.execution
- attack.t1059.001
- attack.t1106
yml_filename: powershell_accessing_win_api.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/powershell/powershell_script