Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Blacklist Malicious SSL certificate detected (Ransomware CnC)"; flow:established,to_client; tls.cert_serial; content:"00:A5:12:0C:27:CC:24:BB:EF"; fast_pattern; tls.cert_subject; content:"CN=Internet|20|Widgits|20|Pty|20|Ltd"; startswith; reference:url,sslbl.abuse.ch; classtype:command-and-control; sid:2021087; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_05_11, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Ransomware, updated_at 2024_04_08, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)