alert tls $EXTERNAL_NET 443 -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Blacklist Malicious SSL certificate detected (Quakbot CnC)"; flow:established,from_server; content:"|09 00|"; content:"|55 04 06|"; distance:0; content:"|02|US"; distance:1; within:3; content:"|55 04 08|"; distance:0; content:"|02|NY"; distance:1; within:3; content:"|55 04 07|"; distance:0; content:"|08|New York"; distance:1; within:9; fast_pattern; content:"|55 04 03|"; byte_test:1,>,27,1,relative; byte_test:1,<,30,1,relative; pcre:"/^.{2}[a-z]{25}\.[a-z]{2,3}[01]/Rs"; reference:url,sslbl.abuse.ch; classtype:domain-c2; sid:2022488; rev:3; metadata:attack_target Client_and_Server, created_at 2016_02_04, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2019_07_26, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)