Tailscale: Tailnet lock validation failed

Identifies tailnet devices with a non-empty TailnetLockError, indicating the device failed tailnet-lock cryptographic validation. Suspicious - likely an unsigned node attempting to join.

Detection logic

Detection requirements

Platform: Containers ESXi IaaS Identity Provider Linux macOS Network Devices Office Suite SaaS Windows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
Log source product: tailscaleccf
Log source service: tailscale_devices_cl

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Detection rules

Tailscale: Tailnet lock validation failed

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules