Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Blacklist Malicious SSL certificate detected (CryptoLocker CnC)"; flow:established,to_client; tls.cert_serial; content:"00:84:D3:15:4C:18:A1:18:9F"; fast_pattern; tls.cert_subject; content:"L=Default City"; content:"O=Default Company Ltd"; reference:url,sslbl.abuse.ch; classtype:domain-c2; sid:2021397; rev:4; metadata:attack_target Client_and_Server, created_at 2015_07_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_11, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)