Computer Discovery And Export Via Get-ADComputer Cmdlet - PowerShell

Description

Detects usage of the Get-ADComputer cmdlet to collect computer information and output it to a file

Query · sigma

selection:
  ScriptBlockText|contains|all:
  - 'Get-ADComputer '
  - ' -Filter \*'
  ScriptBlockText|contains:
  - ' | Select '
  - Out-File
  - Set-Content
  - Add-Content
condition: selection

Known false positives

  • Legitimate admin scripts may use the same technique, it's better to exclude specific computers or users who execute these commands or scripts often
Raw source Computer Discovery And Export Via Get-ADComputer Cmdlet - PowerShell · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Computer Discovery And Export Via Get-ADComputer Cmdlet - PowerShell
id: db885529-903f-4c5d-9864-28fe199e6370
related:
    - id: 435e10e4-992a-4281-96f3-38b11106adde
      type: similar
status: test
description: Detects usage of the Get-ADComputer cmdlet to collect computer information and output it to a file
references:
    - http://blog.talosintelligence.com/2022/09/lazarus-three-rats.html
    - https://www.microsoft.com/en-us/security/blog/2022/10/18/defenders-beware-a-case-for-post-ransomware-investigations/
    - https://www.cisa.gov/uscert/sites/default/files/publications/aa22-320a_joint_csa_iranian_government-sponsored_apt_actors_compromise_federal%20network_deploy_crypto%20miner_credential_harvester.pdf
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-11-17
tags:
    - attack.discovery
    - attack.t1033
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - 'Get-ADComputer '
            - ' -Filter \*'
        ScriptBlockText|contains:
            - ' | Select '
            - 'Out-File'
            - 'Set-Content'
            - 'Add-Content'
    condition: selection
falsepositives:
    - Legitimate admin scripts may use the same technique, it's better to exclude specific computers or users who execute these commands or scripts often
level: medium

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