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Detection rules › Sigma

Disk Image Mounting Via Hdiutil - MacOS

Status
test
Severity
medium
Log source
category process_creation, product macos
Author
Omar Khaled (@beacon_exe)
Source
github.com/SigmaHQ/sigma

Detects the execution of the hdiutil utility in order to mount disk images.

Known false positives

  • Legitimate usage of hdiutil by administrators and users.

MITRE ATT&CK coverage

TacticTechniques
Initial Access
Collection

Telemetry coverage

PlatformRecord / event type
macOSESF event exec (NOTIFY): Fires after execve(2) or posix_spawn(2) succeeds, delivering a post-fact record of the new process.

Rule body

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|endswith: /hdiutil
    CommandLine|contains:
        - 'attach '
        - 'mount '

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • attach
  • mount
field:"CommandLine" kind:match
Imageends_with
  • /hdiutil
field:"Image" kind:ends_with value:"/hdiutil"