Disk Image Mounting Via Hdiutil - MacOS — Sigma Rule

Rule metadata and linked tags

Author: Omar Khaled (@beacon_exe). Source status: test; severity: medium. Source dates: 2024-08-10 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2a80735b93826ba398116127bb124337a6b1ef413f145e4e10ce9644549a72b8

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: Disk Image Mounting Via Hdiutil - MacOS
id: bf241472-f014-4f01-a869-96f99330ca8c
status: test
description: Detects the execution of the hdiutil utility in order to mount disk images.
references:
    - https://www.loobins.io/binaries/hdiutil/
    - https://www.sentinelone.com/blog/from-the-front-linesunsigned-macos-orat-malware-gambles-for-the-win/
    - https://ss64.com/mac/hdiutil.html
author: Omar Khaled (@beacon_exe)
date: 2024-08-10
tags:
    - attack.initial-access
    - attack.collection
    - attack.t1566.001
    - attack.t1560.001
logsource:
    product: macos
    category: process_creation
detection:
    selection:
        Image|endswith: /hdiutil
        CommandLine|contains:
            - 'attach '
            - 'mount '
    condition: selection
falsepositives:
    - Legitimate usage of hdiutil by administrators and users.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate usage of hdiutil by administrators and users.

Source references

• https://www.loobins.io/binaries/hdiutil/
• https://www.sentinelone.com/blog/from-the-front-linesunsigned-macos-orat-malware-gambles-for-the-win/
• https://ss64.com/mac/hdiutil.html