Sigma rule: User Discovery And Export Via Get-ADUser Cmdlet

Rule

Title

User Discovery And Export Via Get-ADUser Cmdlet

Status

test

Level

medium

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2022-09-09

Modified

2022-11-17

File

rules/windows/process_creation/proc_creation_win_powershell_user_discovery_get_aduser.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects usage of the Get-ADUser cmdlet to collect user information and output it to a file

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith:
          - '\powershell.exe'
          - '\pwsh.exe'
    - OriginalFileName:
          - 'PowerShell.EXE'
          - 'pwsh.dll'
selection_cli:
    CommandLine|contains|all:
        - 'Get-ADUser '
        - ' -Filter \*'
    CommandLine|contains:
        - ' > '
        - ' | Select '
        - 'Out-File'
        - 'Set-Content'
        - 'Add-Content'
condition: all of 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

• c2993223-6da8-4b1a-88ee-668b8bf315e9 (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/

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/process_creation/proc_creation_win_powershell_user_discovery_get_aduser.yml