Network Sniffing - Linux — Sigma Rule

Rule metadata and linked tags

Author: Timur Zinniatullin, oscd.community. Source status: test; severity: low. Source dates: 2019-10-21 / 2022-12-18.

{
  "product": "linux",
  "service": "auditd"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2d5c98de09ecc02736e835c1a8b8c6c071ee2da1becd635ffb1d2fd517980f56

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: Network Sniffing - Linux
id: f4d3748a-65d1-4806-bd23-e25728081d01
status: test
description: |
  Network sniffing refers to using the network interface on a system to monitor or capture information sent over a wired or wireless connection.
  An adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1040/T1040.md
author: Timur Zinniatullin, oscd.community
date: 2019-10-21
modified: 2022-12-18
tags:
    - attack.credential-access
    - attack.discovery
    - attack.t1040
logsource:
    product: linux
    service: auditd
detection:
    selection_1:
        type: 'execve'
        a0: 'tcpdump'
        a1: '-c'
        a3|contains: '-i'
    selection_2:
        type: 'execve'
        a0: 'tshark'
        a1: '-c'
        a3: '-i'
    condition: 1 of selection_*
falsepositives:
    - Legitimate administrator or user uses network sniffing tool for legitimate reasons.
level: low

Original YAML and metadata in JSON

False positives

• Legitimate administrator or user uses network sniffing tool for legitimate reasons.

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1040/T1040.md