Sigma rule: Execution via CL_Mutexverifiers.ps1 (2 Lines)

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-fac0aa967b59, updated 2023-02-24T00:00:00.000Z.

Rule

Title
Execution via CL_Mutexverifiers.ps1 (2 Lines)
Status
unsupported
Level
high
Author
oscd.community, Natalia Shornikova
Date
2020/10/14
Modified
2023/02/24
File
unsupported/windows/posh_ps_cl_mutexverifiers_lolscript_count.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects Execution via runAfterCancelProcess in CL_Mutexverifiers.ps1 module

Log source

product
windows
category
ps_script
definition
Requirements: Script Block Logging must be enabled

Detection

selection:
    ScriptBlockText|contains:
        - 'CL_Mutexverifiers.ps1'
        - 'runAfterCancelProcess'
condition: selection | count(ScriptBlockText) by Computer > 2
# PS > Import-Module c:\Windows\diagnostics\system\Audio\CL_Mutexverifiers.ps1
# PS > runAfterCancelProcess c:\Evil.exe

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.defense_evasion
  • attack.t1216

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/windows/posh_ps_cl_mutexverifiers_lolscript_count.yml

Sources and licences

  • SigmaHQ

    "Execution via CL_Mutexverifiers.ps1 (2 Lines)" by oscd.community, Natalia Shornikova (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/windows/posh_ps_cl_mutexverifiers_lolscript_count.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Execution via CL_Mutexverifiers.ps1 (2 Lines)",
entity page, dataset version ref-fac0aa967b59, updated 2023-02-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/6609c444-9670-4eab-9636-fe4755a851ce (accessed 2026-11-03).
Underlying source: SigmaHQ rule 6609c444-9670-4eab-9636-fe4755a851ce, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.