Sigma rule: PowerShell Set-Acl On Windows Folder

Rule

Title

PowerShell Set-Acl On Windows Folder

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2022-10-18

File

rules/windows/process_creation/proc_creation_win_powershell_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

process_creation

Detection

selection_img:
    - OriginalFileName:
          - 'PowerShell.EXE'
          - 'pwsh.dll'
    - Image|endswith:
          - '\powershell.exe'
          - '\pwsh.exe'
selection_cmdlet:
    CommandLine|contains|all:
        - 'Set-Acl '
        - '-AclObject '
selection_paths:
    # Note: Add more suspicious paths
    CommandLine|contains:
        - '-Path "C:\Windows'
        - "-Path 'C:\\Windows"
        - '-Path %windir%'
        - '-Path $env:windir'
selection_permissions:
    # Note: Add more suspicious permissions
    CommandLine|contains:
        - 'FullControl'
        - 'Allow'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.stealth

Related rules

• cae80281-ef23-44c5-873b-fd48d2666f49 (derived)
• bdeb2cff-af74-4094-8426-724dc937f20a (derived)
• 3bf1d859-3a7e-44cb-8809-a99e066d3478 (derived)

References

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

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/process_creation/proc_creation_win_powershell_set_acl_susp_location.yml