alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Zeus OPENSSL Banker Malicious SSL Certificate Detected"; flow:established,to_client; tls.certs; content:"|09 00 a0 c9 ee 35 a4 1c 6f 74|"; fast_pattern; tls.cert_subject; content:"C=AU"; startswith; reference:md5,a8139f8c2547f11522c3d7d58b90c422; classtype:domain-c2; sid:2023590; rev:3; metadata: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_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)