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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: 2022-03-22
  • Author: Teoderick Contreras, Splunk
  • ID: 65711630-f9bf-11eb-8d72-acde48001122

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1546.015 Component Object Model Hijacking Privilege Escalation, Persistence
T1546 Event Triggered Execution Privilege Escalation, Persistence
T1059.001 PowerShell Execution
Kill Chain Phase
  • Exploitation
NIST
CIS20
CVE 


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`powershell` EventCode=4104 ScriptBlockText = "*CreateInstance([type]::GetTypeFromCLSID*" 
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText Computer user_id 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `powershell_execute_com_object_filter`

Macros

The SPL above uses the following Macros:

:information_source: powershell_execute_com_object_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • ScriptBlockText
  • Computer
  • EventCode

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.

Known False Positives

network operrator may use this command.

Associated Analytic Story

RBA

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

:information_source: 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

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: 2