mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Michael Haag
59 lines
2.1 KiB
YAML
59 lines
2.1 KiB
YAML
name: GetAdComputer with PowerShell Script Block
|
|
id: a9a1da02-8e27-4bf7-a348-f4389c9da487
|
|
version: 3
|
|
date: '2022-05-02'
|
|
author: Mauricio Velazco, Splunk
|
|
type: Hunting
|
|
datamodel: []
|
|
description: The following analytic utilizes PowerShell Script Block Logging (EventCode=4104)
|
|
to identify the execution of the `Get-AdGroup` commandlet. The `Get-AdGroup` commandlet
|
|
is used to return a list of all domain computers. Red Teams and adversaries may
|
|
leverage this commandlet to enumerate domain computers for situational awareness
|
|
and Active Directory Discovery.
|
|
search: '`powershell` EventCode=4104 (ScriptBlockText = "*Get-AdComputer*") | stats count
|
|
min(_time) as firstTime max(_time) as lastTime by Opcode Computer
|
|
UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)` | `getadcomputer_with_powershell_script_block_filter`'
|
|
how_to_implement: To successfully implement this analytic, you will need to enable
|
|
PowerShell Script Block Logging on some or all endpoints. Additional setup here
|
|
https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
|
|
known_false_positives: Administrators or power users may use this PowerShell commandlet
|
|
for troubleshooting.
|
|
references:
|
|
- https://attack.mitre.org/techniques/T1018/
|
|
- https://docs.microsoft.com/en-us/powershell/module/activedirectory/get-adgroup?view=windowsserver2019-ps
|
|
tags:
|
|
analytic_story:
|
|
- Active Directory Discovery
|
|
- CISA AA22-320A
|
|
confidence: 50
|
|
context:
|
|
- Source:Endpoint
|
|
- Stage:Discovery
|
|
dataset:
|
|
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1018/AD_discovery/windows-powershell.log
|
|
impact: 30
|
|
kill_chain_phases:
|
|
- Reconnaissance
|
|
message: Remote system discovery enumeration on $Computer$ by $UserID$
|
|
mitre_attack_id:
|
|
- T1018
|
|
observable:
|
|
- name: Computer
|
|
type: Endpoint
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- ScriptBlockText
|
|
- Opcode
|
|
- Computer
|
|
- UserID
|
|
- EventCode
|
|
risk_score: 15
|
|
security_domain: endpoint
|
|
asset_type: Endpoint
|