Sigma rule: Computer Discovery And Export Via Get-ADComputer Cmdlet - PowerShell

Rule

Title

Computer Discovery And Export Via Get-ADComputer Cmdlet - PowerShell

Status

test

Level

medium

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2022-11-17

File

rules/windows/powershell/powershell_script/posh_ps_computer_discovery_get_adcomputer.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

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

False positives (as the rule lists them)

• Legitimate admin scripts may use the same technique, it's better to exclude specific computers or users who execute these commands or scripts often

Tags

• attack.discovery
• attack.t1033

MITRE ATT&CK ids this rule names

• T1033

Related rules

• 435e10e4-992a-4281-96f3-38b11106adde (similar)

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

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_computer_discovery_get_adcomputer.yml