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

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title	excerpt	categories	last_modified_at	toc	toc_label	tags
Script 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

This search looks for scripts launched via WMI.

• 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: aa73f80d-d728-4077-b226-81ea0c8be589

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.process_name=scrcons.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)` 
| `script_execution_via_wmi_filter` 

Macros

The SPL above uses the following Macros:

• security_content_ctime
• security_content_summariesonly

ℹ️ script_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_name
• Processes.user
• Processes.dest

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 launch scripts for legitimate purposes. Filter as needed.

Associated Analytic story

• Suspicious WMI Use

RBA

Risk Score	Impact	Confidence	Message
36.0	60	60	A wmic.exe process process_name taht execute script in host 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://redcanary.com/blog/child-processes/

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/execution_scrcons/windows-sysmon.log

source | version: 4