windows_linked_policies_in_adsi_discovery.yml

name: Windows Linked Policies In ADSI Discovery
id: 510ea428-4731-4d2f-8829-a28293e427aa
version: 1
date: '2023-04-14'
author: Teoderick Contreras, Splunk
status: production
type: Anomaly
description: The following analytic utilizes PowerShell Script Block Logging (EventCode=4104)
  to identify the `[Adsisearcher]` type accelerator being used to query Active Directory
  for domain groups. Red Teams and adversaries may leverage `[Adsisearcher]` to enumerate
  domain organizational unit for situational awareness and Active Directory Discovery.
data_source:
- Powershell Script Block Logging 4104
search: '`powershell` EventCode=4104 ScriptBlockText = "*[adsisearcher]*" ScriptBlockText
  = "*objectcategory=organizationalunit*" ScriptBlockText = "*findAll()*" | stats
  count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
  Computer user_id
  | rename Computer as dest, user_id as user 
  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
  | `windows_linked_policies_in_adsi_discovery_filter`'
how_to_implement: The following Hunting analytic requires PowerShell operational logs
  to be imported. Modify the powershell macro as needed to match the sourcetype or
  add index. This analytic is specific to 4104, or PowerShell Script Block Logging.
known_false_positives: Administrators or power users may use this command for troubleshooting.
references:
- https://www.welivesecurity.com/2022/04/12/industroyer2-industroyer-reloaded/
- https://medium.com/@pentesttas/discover-hidden-gpo-s-on-active-directory-using-ps-adsi-a284b6814c81
tags:
  analytic_story:
  - Data Destruction
  - Active Directory Discovery
  - Industroyer2
  asset_type: Endpoint
  confidence: 50
  impact: 50
  message: Windows PowerShell [Adsisearcher] was used user enumeration on $user$
  mitre_attack_id:
  - T1087.002
  - T1087
  observable:
  - name: dest
    type: Endpoint
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - EventCode
  - ScriptBlockText
  - Computer
  - user_id
  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/adsi_discovery/windows-powershell-xml2.log
    source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
    sourcetype: xmlwineventlog