Dism Remove Online Package — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: medium. Source dates: 2022-01-16 / 2022-08-26.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2d990cacac9d667cd94a9337ebaaa8e4bb34c0d64773eb657533097987db571d

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Dism Remove Online Package
id: 43e32da2-fdd0-4156-90de-50dfd62636f9
status: test
description: Deployment Image Servicing and Management tool. DISM is used to enumerate, install, uninstall, configure, and update features and packages in Windows images
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md#atomic-test-26---disable-windows-defender-with-dism
    - https://www.trendmicro.com/en_us/research/22/h/ransomware-actor-abuses-genshin-impact-anti-cheat-driver-to-kill-antivirus.html
author: frack113
date: 2022-01-16
modified: 2022-08-26
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: process_creation
    product: windows
detection:
    selection_dismhost:
        Image|endswith: '\DismHost.exe'
        ParentCommandLine|contains|all:
            - '/Online'
            - '/Disable-Feature'
            # - '/FeatureName:'
            # - '/Remove'
            # /NoRestart
            # /quiet
    selection_dism:
        Image|endswith: '\Dism.exe'
        CommandLine|contains|all:
            - '/Online'
            - '/Disable-Feature'
            # - '/FeatureName:'
            # - '/Remove'
            # /NoRestart
            # /quiet
    condition: 1 of selection_*
falsepositives:
    - Legitimate script
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_dism_remove/info.yml
simulation:
    - type: atomic-red-team
      name: Disable Windows Defender with DISM
      technique: T1562.001
      atomic_guid: 871438ac-7d6e-432a-b27d-3e7db69faf58

Original YAML and metadata in JSON

False positives

• Legitimate script

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md#atomic-test-26---disable-windows-defender-with-dism
• https://www.trendmicro.com/en_us/research/22/h/ransomware-actor-abuses-genshin-impact-anti-cheat-driver-to-kill-antivirus.html