PowerShell Script Change Permission Via Set-Acl

Description

Detects PowerShell execution to set the ACL of a file or a folder

Query · sigma

selection_img:
- OriginalFileName:
  - PowerShell.EXE
  - pwsh.dll
- Image|endswith:
  - \powershell.exe
  - \pwsh.exe
selection_cmdlet:
  CommandLine|contains|all:
  - 'Set-Acl '
  - '-AclObject '
  - '-Path '
condition: all of selection_*

Known false positives

  • Unknown
Raw source PowerShell Script Change Permission Via Set-Acl · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: PowerShell Script Change Permission Via Set-Acl
id: bdeb2cff-af74-4094-8426-724dc937f20a
related:
    - id: cae80281-ef23-44c5-873b-fd48d2666f49 # PsScript Low
      type: derived
    - id: 0944e002-e3f6-4eb5-bf69-3a3067b53d73 # ProcCreation Susp
      type: derived
    - id: 3bf1d859-3a7e-44cb-8809-a99e066d3478 # PsScript High
      type: derived
status: test
description: Detects PowerShell execution to set the ACL of a file or a folder
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
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-10-18
tags:
    - attack.stealth
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - OriginalFileName:
              - 'PowerShell.EXE'
              - 'pwsh.dll'
        - Image|endswith:
              - '\powershell.exe'
              - '\pwsh.exe'
    selection_cmdlet:
        CommandLine|contains|all:
            - 'Set-Acl '
            - '-AclObject '
            - '-Path '
    condition: all of selection_*
falsepositives:
    - Unknown
level: high

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