alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Zeus OPENSSL Banker Malicious SSL Certificate Detected"; flow:established,to_client; tls.cert_subject; content:"CN=fleil42.com"; reference:md5,50ede75eb74a0a795500cc7b8c6c9f54; classtype:domain-c2; sid:2023591; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2016_12_01, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)