Linux Network Service Scanning - Auditd — Sigma Rule

Rule metadata and linked tags

Author: Alejandro Ortuno, oscd.community. Source status: test; severity: low. Source dates: 2020-10-21 / 2023-09-26.

{
  "product": "linux",
  "service": "auditd",
  "definition": "Configure these rules https://github.com/Neo23x0/auditd/blob/e181243a7c708e9d579557d6f80e0ed3d3483b89/audit.rules#L182-L183"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1cf8f8bdf14232c618b499415187043afb24c35202a2f5017fa4e4cb1b90a942

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: Linux Network Service Scanning - Auditd
id: 3761e026-f259-44e6-8826-719ed8079408
related:
    - id: 3e102cd9-a70d-4a7a-9508-403963092f31
      type: derived
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: 2023-09-26
tags:
    - attack.discovery
    - attack.t1046
logsource:
    product: linux
    service: auditd
    definition: 'Configure these rules https://github.com/Neo23x0/auditd/blob/e181243a7c708e9d579557d6f80e0ed3d3483b89/audit.rules#L182-L183'
detection:
    selection:
        type: 'SYSCALL'
        exe|endswith:
            - '/telnet'
            - '/nmap'
            - '/netcat'
            - '/nc'
            - '/ncat'
            - '/nc.openbsd'
        key: 'network_connect_4'
    condition: selection
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