Query: alert when A self-hosted runner is a system that you deploy and manage to execute jobs from GitHub Actions on GitHub.com. This rule
Matching passage: Sigma rule: A self-hosted runner is a system that you deploy and manage to execute jobs from GitHub Actions on GitHub.com. This rule. Logsource: github / audit. Rule: 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
Near-miss passage: Sigma rule: Detects potential malicious and unauthorized usage of bcdedit.exe. Logsource: windows / process_creation. Rule: title: Potential Ransomware or Unauthorized MBR Tampering Via Bcdedit.EXE id: c9fbe8e9-119d-40a6-9b59-dd58a5d84429 status: test description: Detects potential malicious and unauthorized usage of bcdedit.exe references: - https://learn.microsoft.com/en-us/windows-hardware/drivers/devtest/bcdedit--set - https://twitter.com/malwrhunterteam/status/1372536434125512712/photo/2 author: '@neu5ron' date: 2019-02-07 modified: 2023-02-15 tags: - attack.stealth - attack.t1070 - attack.persistence - attack.t1542.003 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \bcdedit.exe - OriginalFileName: bcdedit.exe selection_cli: CommandLine|contains: - delete - deletevalue - import - safeboot - network condition: all of selection_* level: medium