sigmahighHunting

PowerShell Script Change Permission Via Set-Acl

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

Detection Query

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_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-10-18

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasion

Raw Content

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.defense-evasion
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