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Remote GitHub Actions Runner Registration

This rule detects the configuration of a GitHub Actions self-hosted runner using the Runner.Listener binary. When a machine is registered to a remote repository, its owner gains the ability to execute arbitrary…

Description

This rule detects the configuration of a GitHub Actions self-hosted runner using the Runner.Listener binary. When a machine is registered to a remote repository, its owner gains the ability to execute arbitrary workflow commands on that host. Unexpected or unauthorized runner registration may indicate adversarial activity aimed at establishing remote code execution via malicious GitHub workflows.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

Log source category
event_index

Known benign triggers

  • Authorized github repository with no malicious workflow actions.

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