splunk-security_content/docs/_posts/2021-08-24-getwmiobject_ds_user_with_powershell.md

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title	excerpt	categories	last_modified_at	toc	toc_label	tags
GetWmiObject DS User with PowerShell	Domain Account , Account Discovery	Endpoint	2021-08-24	true		Domain Account Account Discovery Discovery Discovery Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

This analytic looks for the execution of powershell.exe with command-line arguments utilized to query for domain users. The Get-WmiObject commandlet combined with the -class ds_user parameter can be used to return the full list of users in a Windows domain. Red Teams and adversaries alike may leverage WMI in this case, using PowerShell, to enumerate domain users for situational awareness and Active Directory Discovery.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint- Datasource: Splunk Add-on for Sysmon
• Last Updated: 2021-08-24
• Author: Teoderick Contreras, Mauricio Velazco, Splunk
• ID: 22d3b118-04df-11ec-8fa3-acde48001122

Annotations

ATT&CK

ID	Technique	Tactic
T1087.002	Domain Account	Discovery

| T1087 | Account Discovery | Discovery |

Kill Chain Phase

• Reconnaissance

NIST

CIS20

CVE

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="cmd.exe" OR Processes.process_name="powershell*") AND Processes.process = "*get-wmiobject*" AND Processes.process = "*ds_user*" AND Processes.process = "*root\\directory\\ldap*" AND Processes.process = "*-namespace*" by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id Processes.parent_process_name 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `getwmiobject_ds_user_with_powershell_filter`

Macros

The SPL above uses the following Macros:

• security_content_ctime
• security_content_summariesonly

ℹ️ getwmiobject_ds_user_with_powershell_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
• Processes.dest
• Processes.user
• Processes.parent_process
• Processes.process_name
• Processes.process
• Processes.process_id
• Processes.parent_process_id
• Processes.parent_process_name

How To Implement

To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.

Known False Positives

Administrators or power users may use this command for troubleshooting.

Associated Analytic story

• Active Directory Discovery

RBA

Risk Score	Impact	Confidence	Message
25.0	50	50	an instance of process process_name with commandline process in dest

ℹ️ The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

• https://jpcertcc.github.io/ToolAnalysisResultSheet/details/dsquery.htm

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/T1087.002/AD_discovery/windows-sysmon.log

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