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

title, excerpt, categories, last_modified_at, toc, toc_label, tags

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

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Description

This analytic looks for the execution of powershell.exe with command-line arguments utilized to query for local users. 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: 85fae8fa-0427-11ec-8b78-acde48001122

ATT&CK

ID	Technique	Tactic
T1087	Account Discovery	Discovery
T1087.001	Local Account	Discovery

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="powershell.exe") (Processes.process=*Get-LocalUser*) by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `getlocaluser_with_powershell_filter`

Associated Analytic Story

• Active Directory Discovery

How To Implement

To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the Endpoint datamodel in the Processes node.

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-sysmon.log

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