COLDSTEEL RAT Cleanup Command Execution

title: COLDSTEEL RAT Cleanup Command Execution
id: 88516f06-ebe0-47ad-858e-ae9fd060ddea
status: test
description: Detects the creation of a "rundll32" process from the ColdSteel persistence service to initiate the cleanup command by calling one of its own exports. This functionality is not present in "MileStone2017" and some "MileStone2016" samples
references:
    - https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/cold-steel/NCSC-MAR-Cold-Steel.pdf
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-04-30
tags:
    - attack.persistence
    - detection.emerging-threats
    - attack.stealth
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\svchost.exe'
        ParentCommandLine|contains:
            - ' -k msupdate'
            - ' -k msupdate2'
            - ' -k alg'
        Image|endswith: '\rundll32.exe'
        CommandLine|contains:
            - 'UpdateDriverForPlugAndPlayDevicesW'
            - 'ServiceMain'
            - 'DiUninstallDevice'
    condition: selection
falsepositives:
    - Unlikely
level: critical