splunk-security_content/docs/_posts/2021-09-02-getdomaincontroller_with_powershell_script_block.md

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title	excerpt	categories	last_modified_at	toc	toc_label	tags
GetDomainController with PowerShell Script Block	Remote System Discovery	Endpoint	2021-09-02	true		Remote System Discovery Discovery Splunk Enterprise Splunk Enterprise Security Splunk Cloud

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Description

The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the execution of the Get-DomainController commandlet. Get-DomainController is part of PowerView, a PowerShell tool used to perform enumeration on Windows domains. Red Teams and adversaries alike may use PowerView to enumerate domain computers for situational awareness and Active Directory Discovery.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel:
• Last Updated: 2021-09-02
• Author: Mauricio Velazco, Splunk
• ID: 676b600a-a94d-4951-b346-11329431e6c1

ATT&CK

ID	Technique	Tactic
T1018	Remote System Discovery	Discovery

Search

`powershell` EventCode=4104 (Message = "*Get-DomainController*") 
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Message ComputerName User 
| `security_content_ctime(firstTime)` 
| `getdomaincontroller_with_powershell_script_block_filter`

Macros

The SPL above uses the following Macros:

• powershell
• security_content_ctime

Note that getdomaincontroller_with_powershell_script_block_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

• _time
• EventCode
• Message
• ComputerName
• User

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.

Associated Analytic story

• Active Directory Discovery

Kill Chain Phase

• Reconnaissance

RBA

Risk Score	Impact	Confidence	Message
24.0	30	80	Remote system discovery with PowerView on dest by user

Reference

• https://attack.mitre.org/techniques/T1018/
• https://powersploit.readthedocs.io/en/latest/Recon/Get-DomainController/

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1018/AD_discovery/windows-powershell.log

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