alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Magecart/Skimmer CnC)"; flow:established,to_client; tls.cert_subject; content:"CN=google-conversion.com"; bsize:24; fast_pattern; reference:url,twitter.com/jeromesegura/status/1354598447022653442; classtype:domain-c2; sid:2031593; rev:1; metadata:affected_product Web_Browsers, attack_target Client_and_Server, created_at 2021_01_29, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_29, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)