Sigma rule: PowerShell Set-Acl On Windows Folder - PsScript

Rule

Title

PowerShell Set-Acl On Windows Folder - PsScript

Status

test

Level

high

Author

frack113, Nasreddine Bencherchali (Nextron Systems)

Date

2023-07-18

File

rules/windows/powershell/powershell_script/posh_ps_set_acl_susp_location.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects PowerShell scripts to set the ACL to a file in the Windows folder

Log source

product

windows

category

ps_script

definition

bade5735-5ab0-4aa7-a642-a11be0e40872

Detection

selection_cmdlet:
    ScriptBlockText|contains|all:
        - 'Set-Acl '
        - '-AclObject '
selection_paths:
    # Note: Add more suspicious paths
    ScriptBlockText|contains:
        - '-Path "C:\Windows'
        - '-Path "C:/Windows'
        - "-Path 'C:\\Windows"
        - "-Path 'C:/Windows"
        - '-Path C:\\Windows'
        - '-Path C:/Windows'
        - '-Path $env:windir'
        - '-Path "$env:windir'
        - "-Path '$env:windir"
selection_permissions:
    # Note: Add more suspicious permissions
    ScriptBlockText|contains:
        - 'FullControl'
        - 'Allow'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.defense-impairment
• attack.t1222

MITRE ATT&CK ids this rule names

• T1222

Related rules

• cae80281-ef23-44c5-873b-fd48d2666f49 (derived)
• 0944e002-e3f6-4eb5-bf69-3a3067b53d73 (derived)
• bdeb2cff-af74-4094-8426-724dc937f20a (derived)

References

• https://github.com/redcanaryco/atomic-red-team/blob/74438b0237d141ee9c99747976447dc884cb1a39/atomics/T1505.005/T1505.005.md
• https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.security/set-acl?view=powershell-5.1

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