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Description

this search is designed to detect potential malicious process loading COM object to wbemprox.dll,

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2021-06-02
  • Author: Teoderick Contreras, Splunk
  • ID: 9d911ce0-c3be-11eb-b177-acde48001122

ATT&CK

ID Technique Tactic
T1218.003 CMSTP Defense Evasion
`sysmon` EventCode=7  ImageLoaded IN ("*\\fastprox.dll", "*\\wbemprox.dll", "*\\wbemcomn.dll") NOT (process_name IN ("wmiprvse.exe", "WmiApSrv.exe", "unsecapp.exe")) NOT(Image IN("*\\windows\\*","*\\program files*", "*\\wbem\\*")) 
| stats count min(_time) as firstTime max(_time) as lastTime by Image ImageLoaded process_name Computer EventCode Signed ProcessId Hashes IMPHASH 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `wbemprox_com_object_execution_filter`

Associated Analytic Story

How To Implement

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

Required field

  • _time
  • Image
  • ImageLoaded
  • process_name
  • Computer
  • EventCode
  • Signed
  • ProcessId
  • Hashes
  • IMPHASH

Kill Chain Phase

  • Exploitation

Known False Positives

legitimate process that are not in the exception list may trigger this event.

RBA

Risk Score Impact Confidence Message
35.0 70 50 Suspicious COM Object Execution on $Computer$

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: 1