Detection: GetWmiObject DS User with PowerShell

Description

The following analytic detects the execution of powershell.exe with command-line arguments used to query domain users via the Get-WmiObject cmdlet and -class ds_user parameter. This detection leverages data from Endpoint Detection and Response (EDR) agents, focusing on process names and command-line executions. This activity is significant as it indicates potential reconnaissance efforts by adversaries to enumerate domain users, which is a common step in Active Directory Discovery. If confirmed malicious, this could lead to further attacks, including privilege escalation and lateral movement within the network.

Search

 1
 2| tstats `security_content_summariesonly`
 3  count min(_time) as firstTime
 4        max(_time) as lastTime
 5
 6from datamodel=Endpoint.Processes where
 7
 8(
 9    `process_powershell`
10    OR
11    `process_cmd`
12)
13AND
14Processes.process = "*get-wmiobject*"
15Processes.process = "*ds_user*"
16Processes.process = "*root\\directory\\ldap*"
17Processes.process = "*-namespace*"
18
19by Processes.action Processes.dest Processes.original_file_name
20   Processes.parent_process Processes.parent_process_exec
21   Processes.parent_process_guid Processes.parent_process_id
22   Processes.parent_process_name Processes.parent_process_path
23   Processes.process Processes.process_exec Processes.process_guid
24   Processes.process_hash Processes.process_id
25   Processes.process_integrity_level Processes.process_name
26   Processes.process_path Processes.user
27   Processes.user_id Processes.vendor_product
28
29
30| `drop_dm_object_name(Processes)`
31
32| `security_content_ctime(firstTime)`
33
34| `security_content_ctime(lastTime)`
35
36| `getwmiobject_ds_user_with_powershell_filter`

Data Source

Name	Platform	Sourcetype	Source
CrowdStrike ProcessRollup2	Other	'crowdstrike:events:sensor'	'crowdstrike'
Sysmon EventID 1	Windows	'XmlWinEventLog'	'XmlWinEventLog:Microsoft-Windows-Sysmon/Operational'
Windows Event Log Security 4688	Windows	'XmlWinEventLog'	'XmlWinEventLog:Security'

Macros Used

Annotations

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Implementation

The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the process GUID, process name, and parent process. Additionally, you must ingest complete command-line executions. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the Processes node of the Endpoint data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process.

Known False Positives

Administrators or power users may use this command for troubleshooting.

Associated Analytic Story

• Active Directory Discovery

Risk Based Analytics (RBA)

Risk Message:

an instance of process $process_name$ with commandline $process$ on $dest$

References

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

Detection Testing

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

Source: GitHub | Version: 10