splunk-security_content/docs/_posts/2021-08-23-getlocaluser_with_powershell_script_block.md

title, excerpt, categories, last_modified_at, toc, tags

title	excerpt	categories	last_modified_at	toc	tags
GetLocalUser with PowerShell Script Block	Local Account	Endpoint	2021-08-23	true	Hunting T1087.001 Local Account Discovery Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint Reconnaissance

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Description

The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the execution of the Get-LocalUser commandlet. The Get-LocalUser commandlet is used to return a list of all local users. Red Teams and adversaries may leverage this commandlet to enumerate users for situational awareness and Active Directory Discovery.

• Type: Hunting
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-08-23
• Author: Mauricio Velazco, Splunk
• ID: 2e891cbe-0426-11ec-9c9c-acde48001122

ATT&CK

ID	Technique	Tactic
T1087.001	Local Account	Discovery

Search

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

Associated Analytic Story

• Active Directory Discovery

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.

Required field

• _time

Kill Chain Phase

• Reconnaissance

Known False Positives

Administrators or power users may use this PowerShell commandlet for troubleshooting.

RBA

Risk Score	Impact	Confidence	Message
15.0	30	50	Local user discovery enumeration using PowerShell on dest by user

Reference

• https://attack.mitre.org/techniques/T1087/001/

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/T1087.001/AD_discovery/windows-powershell.log

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