Docker Container Discovery Via Dockerenv Listing — Sigma Rule

Rule metadata and linked tags

Author: Seth Hanford. Source status: test; severity: low. Source dates: 2023-08-23 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 47eda2228690e3d31ee08fc3202031bf61c7573405c91f606ffe094f3fe56d7d

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: Docker Container Discovery Via Dockerenv Listing
id: 11701de9-d5a5-44aa-8238-84252f131895
status: test
description: Detects listing or file reading of ".dockerenv" which can be a sing of potential container discovery
references:
    - https://blog.skyplabs.net/posts/container-detection/
    - https://stackoverflow.com/questions/20010199/how-to-determine-if-a-process-runs-inside-lxc-docker
tags:
    - attack.discovery
    - attack.t1082
author: Seth Hanford
date: 2023-08-23
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith:
            # Note: add additional tools and utilities to increase coverage
            - '/cat'
            - '/dir'
            - '/find'
            - '/ls'
            - '/stat'
            - '/test'
            - 'grep'
        CommandLine|endswith: '.dockerenv'
    condition: selection
falsepositives:
    - Legitimate system administrator usage of these commands
    - Some container tools or deployments may use these techniques natively to determine how they proceed with execution, and will need to be filtered
level: low

Original YAML and metadata in JSON

False positives

• Legitimate system administrator usage of these commands
• Some container tools or deployments may use these techniques natively to determine how they proceed with execution, and will need to be filtered

Source references

• https://blog.skyplabs.net/posts/container-detection/
• https://stackoverflow.com/questions/20010199/how-to-determine-if-a-process-runs-inside-lxc-docker