Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Interlock CnC Domain in TLS SNI (ears-circus-cam-lake .trycloudflare .com)"; flow:established,to_server; tls.sni; bsize:38; content:"ears-circus-cam-lake.trycloudflare.com"; fast_pattern; reference:url,blog.sekoia.io/interlock-ransomware-evolving-under-the-radar/; classtype:domain-c2; sid:2062909; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_06_11, deployment Perimeter, malware_family Interlock, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag AI_Generated_Description, updated_at 2025_06_11, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)