Tailscale: ACL policy churn

Identifies short windows where the tailnet ACL policy file was rewritten multiple times. Iterative policy edits during an incident can indicate a defender adjusting rules or an attacker probing.

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_audit_cl

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Detection rules

Tailscale: ACL policy churn

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules