Active Directory Computers Enumeration With Get-AdComputer — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: low. Source dates: 2022-03-17 / 2023-07-08.

{
  "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: 8abff1b3dcceec9dc0cf92f18247cafc1ed140f1959b5e0e6ca87b36f7118955

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: Active Directory Computers Enumeration With Get-AdComputer
id: 36bed6b2-e9a0-4fff-beeb-413a92b86138
status: test
description: Detects usage of the "Get-AdComputer" to enumerate Computers or properties within Active Directory.
references:
    - https://learn.microsoft.com/en-us/powershell/module/activedirectory/get-adcomputer
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md
    - https://github.com/redcanaryco/atomic-red-team/blob/02cb591f75064ffe1e0df9ac3ed5972a2e491c97/atomics/T1087.002/T1087.002.md
author: frack113
date: 2022-03-17
modified: 2023-07-08
tags:
    - attack.discovery
    - attack.t1018
    - attack.t1087.002
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_cmdlet:
        ScriptBlockText|contains: 'Get-AdComputer '
    selection_option:
        ScriptBlockText|contains:
            - '-Filter '
            - '-LDAPFilter '
            - '-Properties '
    condition: all of selection_*
falsepositives:
    - Unknown
level: low

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/powershell/module/activedirectory/get-adcomputer
• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md
• https://github.com/redcanaryco/atomic-red-team/blob/02cb591f75064ffe1e0df9ac3ed5972a2e491c97/atomics/T1087.002/T1087.002.md