splunk-security_content/docs/_posts/2021-08-10-powershell_execute_com_object.md

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Powershell Execute COM Object	Component Object Model Hijacking, Event Triggered Execution	Endpoint	2021-08-10	true		TTP T1546.015 Component Object Model Hijacking Privilege Escalation Persistence T1546 Event Triggered Execution Privilege Escalation Persistence Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint Exploitation

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Description

This search is to detect a COM CLSID execution through powershell. This technique was seen in several adversaries and malware like ransomware conti where it has a feature to execute command using COM Object. This technique may use by network operator at some cases but a good indicator if some application want to gain privilege escalation or bypass uac.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-08-10
• Author: Teoderick Contreras, Splunk
• ID: 65711630-f9bf-11eb-8d72-acde48001122

ATT&CK

ID	Technique	Tactic
T1546.015	Component Object Model Hijacking	Privilege Escalation, Persistence
T1546	Event Triggered Execution	Privilege Escalation, Persistence

Search

`powershell` EventCode=4104 Message = "*CreateInstance([type]::GetTypeFromCLSID*" OR Message = "*CreateInstance([Type]::GetTypeFromProgID*"
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Message ComputerName User 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `powershell_execute_com_object_filter`

Associated Analytic Story

• Malicious PowerShell
• Ransomware

How To Implement

To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line 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

Kill Chain Phase

• Exploitation

Known False Positives

network operrator may use this command.

RBA

Risk Score	Impact	Confidence	Message
5.0	10	50	A suspicious powershell script contains COM CLSID command in Message with EventCode EventCode in host ComputerName

Reference

• https://threadreaderapp.com/thread/1423361119926816776.html

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/malware/conti/conti_leak/windows-powershell.log

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