splunk-security_content/docs/_posts/2021-09-14-powershell_get_localgroup_discovery.md

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

title	excerpt	categories	last_modified_at	toc	toc_label	tags
PowerShell Get LocalGroup Discovery	Permission Groups Discovery, Local Groups	Endpoint	2021-09-14	true		Permission Groups Discovery Discovery Local Groups Discovery Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

The following hunting analytic identifies the use of get-localgroup being used with PowerShell to identify local groups on the endpoint. During triage, review parallel processes and identify any further suspicious behavior.

• Type: Hunting
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-09-14
• Author: Michael Haag, Splunk
• ID: b71adfcc-155b-11ec-9413-acde48001122

ATT&CK

ID	Technique	Tactic
T1069	Permission Groups Discovery	Discovery

| T1069.001 | Local Groups | 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 OR Processes.process_name=cmd.exe) (Processes.process="*get-localgroup*") by Processes.dest Processes.user Processes.parent_process_name 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)` 
| `powershell_get_localgroup_discovery_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. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.

Required field

• _time
• Processes.dest
• Processes.user
• Processes.parent_process_name
• Processes.parent_process
• Processes.original_file_name
• Processes.process_name
• Processes.process
• Processes.process_id
• Processes.parent_process_path
• Processes.process_path
• Processes.parent_process_id

Kill Chain Phase

• Reconnaissance

Known False Positives

False positives may be present. Tune as needed.

RBA

Risk Score	Impact	Confidence	Message
15.0	30	50	Local group discovery on dest by user.

Reference

• https://attack.mitre.org/techniques/T1069/001/
• https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1069.001/T1069.001.md

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/T1069.001/atomic_red_team/windows-sysmon.log

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