Possible Script Proxy Execution Through CL_Mutexverifiers.ps1 (via process_creation)

title: Possible Script Proxy Execution Through CL_Mutexverifiers.ps1 (via process_creation)
id: c4342c10-7910-533c-97f4-850afa26cb60
status: stable
description: This rule detects the use of the Microsoft signed script "CL_mutexverifiers" to proxy the execution of additional PowerShell script commands
references:
    - https://attack.mitre.org/techniques/T1216/
    - https://lolbas-project.github.io/lolbas/Scripts/CL_mutexverifiers/
author: Huntrule Team
date: 2026-05-20
tags:
    - attack.stealth
    - attack.t1216
logsource:
    category: process_creation
    product: windows
detection:
    selection_pwsh:
        ParentImage|endswith:
            - '\powershell.exe'
            - '\pwsh.exe'
        Image|endswith: '\powershell.exe'
        CommandLine|contains: ' -nologo -windowstyle minimized -file '
    selection_temp:
        CommandLine|contains:
            - '\AppData\Local\Temp\'
            - '\Windows\Temp\'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium