splunk-security_content/docs/_posts/2020-03-16-process_execution_via_wmi.md

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title	excerpt	categories	last_modified_at	toc	toc_label	tags
Process Execution via WMI	Windows Management Instrumentation	Endpoint	2020-03-16	true		Windows Management Instrumentation Execution Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

The following analytic identifies WmiPrvSE.exe spawning a process. This typically occurs when a process is instantiated from a local or remote process using wmic.exe. During triage, review parallel processes for suspicious behavior or commands executed. Review the process and command-line spawning from wmiprvse.exe. Contain and remediate the endpoint as necessary.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint- Datasource: Splunk Add-on for Sysmon
• Last Updated: 2020-03-16
• Author: Rico Valdez, Michael Haag, Splunk
• ID: 24869767-8579-485d-9a4f-d9ddfd8f0cac

Annotations

ATT&CK

ID	Technique	Tactic
T1047	Windows Management Instrumentation	Execution

Kill Chain Phase

• Actions on Objectives

NIST

• PR.PT
• PR.AT
• PR.AC
• PR.IP

CIS20

• CIS 3
• CIS 5

CVE

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=WmiPrvSE.exe 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)` 
| `process_execution_via_wmi_filter` 

Macros

The SPL above uses the following Macros:

• security_content_summariesonly
• security_content_ctime

Note that process_execution_via_wmi_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.process
• Processes.parent_process_name
• Processes.user
• Processes.dest
• Processes.process_name

How To Implement

You must be ingesting endpoint data that tracks process activity, including parent-child relationships from your endpoints to populate the Endpoint data model in the Processes node. The command-line arguments are mapped to the "process" field in the Endpoint data model.

Known False Positives

Although unlikely, administrators may use wmi to execute commands for legitimate purposes.

Associated Analytic story

• Suspicious WMI Use

RBA

Risk Score	Impact	Confidence	Message
49.0	70	70	A remote instance execution of wmic.exe that will spawn parent_process_name in host dest

Reference

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/T1047/atomic_red_team/windows-sysmon.log

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