Try in Splunk Security Cloud

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
  • Last Updated: 2020-03-16
  • Author: Rico Valdez, Michael Haag, Splunk
  • ID: 24869767-8579-485d-9a4f-d9ddfd8f0cac

ATT&CK

ID Technique Tactic
T1047 Windows Management Instrumentation Execution

| 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` 

Associated Analytic Story

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.

Required field

  • _time
  • Processes.process
  • Processes.parent_process_name
  • Processes.user
  • Processes.dest
  • Processes.process_name

Kill Chain Phase

  • Actions on Objectives

Known False Positives

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

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

source | version: 4