MediumSigmaHQ Kamran Saifullah +1

Network Connection Initiated To Cloudflared Tunnels Domains

Detects network connections to Cloudflared tunnels domains initiated by a process on the system. Attackers can abuse that feature to establish a reverse shell or persistence on a machine.

Detection logic

Detection requirements

Platform: ESXi Linux macOS Office Suite SaaS Windows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
Log source product: windows
Log source category: network_connection

Known benign triggers

Legitimate use of cloudflare tunnels will also trigger this.

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
defr0ggy.github.io/research/Abusing-Cloudflared-A-Proxy-Service-To-Host-Share-Applications/	Unclassified	Only this detection cites it
www.guidepointsecurity.com/blog/tunnel-vision-cloudflared-abused-in-the-wild/	Unclassified	7from 2 sources

Detection rules

Network Connection Initiated To Cloudflared Tunnels Domains

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules