Detection rules › Sigma
Container Residence Discovery Via Proc Virtual FS
Detects potential container discovery via listing of certain kernel features in the "/proc" virtual filesystem
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Discovery | T1082 System Information Discovery |
Event coverage
| Provider | Event |
|---|---|
| Sysmon-for-Linux | Event ID 1 |
Rule body yaml
title: Container Residence Discovery Via Proc Virtual FS
id: 746c86fb-ccda-4816-8997-01386263acc4
status: test
description: Detects potential container discovery via listing of certain kernel features in the "/proc" virtual filesystem
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_tools:
Image|endswith:
- 'awk'
- '/cat'
- 'grep'
- '/head'
- '/less'
- '/more'
- '/nl'
- '/tail'
selection_procfs_kthreadd: # outside containers, PID 2 == kthreadd
CommandLine|contains: '/proc/2/'
selection_procfs_target:
CommandLine|contains: '/proc/'
CommandLine|endswith:
- '/cgroup' # cgroups end in ':/' outside containers
- '/sched' # PID mismatch when run in containers
condition: selection_tools and 1 of selection_procfs_*
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
Stages and Predicates
Stage 0: condition
selection_tools and 1 of selection_procfs_*Stage 1: selection_tools
selection_tools:
Image|endswith:
- 'awk'
- '/cat'
- 'grep'
- '/head'
- '/less'
- '/more'
- '/nl'
- '/tail'
Stage 2: selection_procfs_kthreadd
selection_procfs_kthreadd:
CommandLine|contains: '/proc/2/'
Stage 3: selection_procfs_target
selection_procfs_target:
CommandLine|contains: '/proc/'
CommandLine|endswith:
- '/cgroup'
- '/sched'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | ends_with |
|
CommandLine | match |
|
Image | ends_with |
|