name: Get ADUser with PowerShell
id: 0b6ee3f4-04e3-11ec-a87d-acde48001122
version: 1
date: '2021-08-24'
author: Teoderick Contreras, Mauricio Velazco, Splunk
status: production
type: Hunting
description: This analytic looks for the execution of `powershell.exe` with command-line
  arguments utilized to enumerate domain users. The `Get-AdUser' commandlet returns
  a list of all domain users. Red Teams and adversaries alike may use this commandlet
  to identify remote systems for situational awareness and Active Directory Discovery.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine: '*Get-ADUser*'
    Image|endswith:
    - powershell*
    - cmd.exe
  selection2:
    CommandLine: '*-filter*'
  condition: selection1 and selection2
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the process name, parent process, and command-line executions from your
  endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
  Sysmon TA.
known_false_positives: Administrators or power users may use this command for troubleshooting.
references:
- https://www.blackhillsinfosec.com/red-blue-purple/
- https://attack.mitre.org/techniques/T1087/002/
- https://docs.microsoft.com/en-us/powershell/module/activedirectory/get-aduser?view=windowsserver2019-ps
tags:
  analytic_story:
  - Active Directory Discovery
  asset_type: Endpoint
  confidence: 50
  impact: 50
  message: an instance of process $process_name$ with commandline $process$ in $dest$
  mitre_attack_id:
  - T1087.002
  - T1087
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 25
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1087.002/AD_discovery/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog