Suspicious Cabinet File Execution Via Msdt.EXE — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems), GossiTheDog, frack113. Source status: test; severity: medium. Source dates: 2022-06-21 / 2024-03-13.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 4cf572629ec51a4fd5435d309e371730ed4680c9988643dbff034f706c46f684

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: Suspicious Cabinet File Execution Via Msdt.EXE
id: dc4576d4-7467-424f-9eee-fd2b02855fe0
related:
    - id: 6545ce61-a1bd-4119-b9be-fcbee42c0cf3
      type: obsolete
status: test
description: Detects execution of msdt.exe using the "cab" flag which could indicates suspicious diagcab files with embedded answer files leveraging CVE-2022-30190
references:
    - https://twitter.com/nas_bench/status/1537896324837781506
    - https://github.com/GossiTheDog/ThreatHunting/blob/e85884abbf05d5b41efc809ea6532b10b45bd05c/AdvancedHuntingQueries/DogWalk-DiagCab
    - https://github.com/elastic/protections-artifacts/commit/746086721fd385d9f5c6647cada1788db4aea95f#diff-9015912909545e72ed42cbac4d1e96295e8964579c406d23fd9c47a8091576a0
    - https://irsl.medium.com/the-trouble-with-microsofts-troubleshooters-6e32fc80b8bd
author: Nasreddine Bencherchali (Nextron Systems), GossiTheDog, frack113
date: 2022-06-21
modified: 2024-03-13
tags:
    - attack.stealth
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\msdt.exe'
        - OriginalFileName: 'msdt.exe'
    selection_cmd:
        CommandLine|contains|windash: ' -cab '
    condition: all of selection_*
falsepositives:
    - Legitimate usage of ".diagcab" files
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate usage of ".diagcab" files

Source references

• https://twitter.com/nas_bench/status/1537896324837781506
• https://github.com/GossiTheDog/ThreatHunting/blob/e85884abbf05d5b41efc809ea6532b10b45bd05c/AdvancedHuntingQueries/DogWalk-DiagCab
• https://github.com/elastic/protections-artifacts/commit/746086721fd385d9f5c6647cada1788db4aea95f#diff-9015912909545e72ed42cbac4d1e96295e8964579c406d23fd9c47a8091576a0
• https://irsl.medium.com/the-trouble-with-microsofts-troubleshooters-6e32fc80b8bd