MacOS Network Service Scanning — Sigma Rule

Rule metadata and linked tags

Author: Alejandro Ortuno, oscd.community. Source status: test; severity: low. Source dates: 2020-10-21 / 2021-11-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 73b23229cafc5f7c7b88b7e2d7fd2f29dfa7e05e63289ff74276224bf9647ae5

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: MacOS Network Service Scanning
id: 84bae5d4-b518-4ae0-b331-6d4afd34d00f
status: test
description: Detects enumeration of local or remote network services.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1046/T1046.md
author: Alejandro Ortuno, oscd.community
date: 2020-10-21
modified: 2021-11-27
tags:
    - attack.discovery
    - attack.t1046
logsource:
    category: process_creation
    product: macos
detection:
    selection_1:
        Image|endswith:
            - '/nc'
            - '/netcat'
    selection_2:
        Image|endswith:
            - '/nmap'
            - '/telnet'
    filter:
        CommandLine|contains: 'l'
    condition: (selection_1 and not filter) or selection_2
falsepositives:
    - Legitimate administration activities
level: low

Original YAML and metadata in JSON

False positives

• Legitimate administration activities

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1046/T1046.md