alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Malicious SSL Certificate Detected (Gootkit CnC)"; flow:established,to_client; tls.cert_serial; content:"00:C7:52:05:4B:9D:0E:F6:96"; tls.cert_subject; content:"CN=localhost"; reference:md5,fa224c69088cc331a6b30bc5069fa9d5; classtype:domain-c2; sid:2023550; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2016_11_23, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_22, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)