Network Connection Initiated To Cloudflared Tunnels Domains
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About the rule
Rule Type
Standard
Rule Description
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.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "sa_network_connection" AND IS_INITIATED = "true" AND DESTINATIONHOST endswith ".v2.argotunnel.com,protocol-v2.argotunnel.com,trycloudflare.com,update.argotunnel.com" select Action1.HOSTNAME,Action1.MESSAGE,Action1.USERNAME,Action1.PROCESSNAME,Action1.DESTINATIONHOST,Action1.DESTINATION_IPV6,Action1.DEST_IP,Action1.SOURCEHOST,Action1.SOURCE_IP,Action1.SOURCE_IPV6
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Kamran Saifullah, Nasreddine Bencherchali (Nextron Systems)
