alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Blacklist Malicious SSL certificate detected (KINS C2)"; flow:from_server,established; content:"|55 04 06|"; content:"|02|XX"; distance:1; within:3; content:"|55 04 07|"; distance:0; content:"|0c|Default City"; distance:1; within:13; content:"|55 04 0a|"; distance:0; content:"|13|Default Company Ltd"; fast_pattern; distance:1; within:20; tls.fingerprint:"f7:41:76:2e:a8:09:4a:8d:95:ad:84:ba:ea:0d:42:e8:0c:e5:84:d0"; reference:url,sslbl.abuse.ch; classtype:domain-c2; sid:2018863; rev:4; metadata:attack_target Client_and_Server, created_at 2014_07_31, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)