detection.wiki

Detection rules › Sigma

OSACompile Run-Only Execution

Status
test
Severity
high
Log source
category process_creation, product macos
Author
Sohan G (D4rkCiph3r)
Source
github.com/SigmaHQ/sigma

Detects potential suspicious run-only executions compiled using OSACompile

MITRE ATT&CK coverage

TacticTechniques
Execution

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: 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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains|all:
        - 'osacompile'
        - ' -x '
        - ' -e '

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • -e
  • -x
  • osacompile
field:"CommandLine" kind:match