title: Github Self Hosted Runner Changes Detected
id: f8ed0e8f-7438-4b79-85eb-f358ef2fbebd
status: test
description: |
A self-hosted runner is a system that you deploy and manage to execute jobs from GitHub Actions on GitHub.com.
This rule detects changes to self-hosted runners configurations in the environment. The self-hosted runner configuration changes once detected,
it should be validated from GitHub UI because the log entry may not provide full context.
author: Muhammad Faisal (@faisalusuf)
date: 2023-01-27
references:
- https://docs.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners#about-self-hosted-runners
- https://docs.github.com/en/organizations/keeping-your-organization-secure/managing-security-settings-for-your-organization/reviewing-the-audit-log-for-your-organization#search-based-on-operation
tags:
- attack.impact
- attack.discovery
- attack.collection
- attack.persistence
- attack.privilege-escalation
- attack.initial-access
- attack.stealth
- attack.t1526
- attack.t1213.003
- attack.t1078.004
logsource:
product: github
service: audit
definition: 'Requirements: The audit log streaming feature must be enabled to be able to receive such logs. You can enable following the documentation here: https://docs.github.com/en/enterprise-cloud@latest/admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/streaming-the-audit-log-for-your-enterprise#setting-up-audit-log-streaming'
detection:
selection:
action:
- 'org.remove_self_hosted_runner'
- 'org.runner_group_created'
- 'org.runner_group_removed'
- 'org.runner_group_runner_removed'
- 'org.runner_group_runners_added'
- 'org.runner_group_runners_updated'
- 'org.runner_group_updated'
- 'repo.register_self_hosted_runner'
- 'repo.remove_self_hosted_runner'
condition: selection
falsepositives:
- Allowed self-hosted runners changes in the environment.
- A self-hosted runner is automatically removed from GitHub if it has not connected to GitHub Actions for more than 14 days.
- An ephemeral self-hosted runner is automatically removed from GitHub if it has not connected to GitHub Actions for more than 1 day.
level: low