Suspicious GPO Discovery With Get-GPO — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: low. Source dates: 2022-06-04 / not supplied.

{
  "product": "windows",
  "category": "ps_script",
  "definition": "Requirements: Script Block Logging must be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: fcb9aee539397bb9f618a2e83a713b15cf6a8fec103aa399ec086bc2916ac120

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Suspicious GPO Discovery With Get-GPO
id: eb2fd349-ec67-4caa-9143-d79c7fb34441
status: test
description: Detect use of Get-GPO to get one GPO or all the GPOs in a domain.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1615/T1615.md
    - https://learn.microsoft.com/en-us/powershell/module/grouppolicy/get-gpo?view=windowsserver2022-ps
author: frack113
date: 2022-06-04
tags:
    - attack.discovery
    - attack.t1615
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains: Get-GPO
    condition: selection
falsepositives:
    - Legitimate PowerShell scripts
level: low

Original YAML and metadata in JSON

False positives

• Legitimate PowerShell scripts

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1615/T1615.md
• https://learn.microsoft.com/en-us/powershell/module/grouppolicy/get-gpo?view=windowsserver2022-ps