Network Sniffing - MacOs

Status: test
Severity: informational
Log source: category process_creation, product macos
Author: Alejandro Ortuno, oscd.community
Source: github.com/SigmaHQ/sigma

Detects the usage of tooling to sniff network traffic. 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.

Known false positives

Legitimate administration activities

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1040` Network Sniffing
Discovery	`T1040` Network Sniffing

Telemetry coverage

Platform	Record / event type
macOS	ESF event `exec` (NOTIFY): Fires after execve(2) or posix_spawn(2) succeeds, delivering a post-fact record of the new process.

Rule body

title: Network Sniffing - MacOs
id: adc9bcc4-c39c-4f6b-a711-1884017bf043
status: test
description: |
  Detects the usage of tooling to sniff network traffic.
  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: Alejandro Ortuno, oscd.community
date: 2020-10-14
modified: 2022-11-26
tags:
    - attack.discovery
    - attack.credential-access
    - attack.t1040
logsource:
    category: process_creation
    product: macos
detection:
    selection:
        Image|endswith:
            - '/tcpdump'
            - '/tshark'
    condition: selection
falsepositives:
    - Legitimate administration activities
level: informational

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    Image|endswith:
        - '/tcpdump'
        - '/tshark'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Image`	ends_with	`/tcpdump` `/tshark`	`field:"Image" kind:ends_with`