OSACompile Run-Only Execution — Sigma Rule

Rule metadata and linked tags

Author: Sohan G (D4rkCiph3r). Source status: test; severity: high. Source dates: 2023-01-31 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3e26c1f8c5fad9273cd2ef8acac48272e3629af7278d86e5b3f6038fe3755d1e

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: OSACompile Run-Only Execution
id: b9d9b652-d8ed-4697-89a2-a1186ee680ac
status: test
description: Detects potential suspicious run-only executions compiled using OSACompile
references:
    - https://redcanary.com/blog/applescript/
    - https://ss64.com/osx/osacompile.html
author: Sohan G (D4rkCiph3r)
date: 2023-01-31
tags:
    - attack.t1059.002
    - attack.execution
logsource:
    product: macos
    category: process_creation
detection:
    selection:
        CommandLine|contains|all:
            - 'osacompile'
            - ' -x '
            - ' -e '
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://redcanary.com/blog/applescript/
• https://ss64.com/osx/osacompile.html