alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Fingerprint Blacklist Malicious SSL Certificate Detected (Gootkit C2)"; flow:from_server,established; content:"|16|"; content:"|55 04 03|"; content:"|09|localhost"; distance:1; within:11; content:"|09 00 ff 41 25 0a bf 95 6d 71|"; fast_pattern; content:"|55 04 0b|"; distance:0; content:"|0b|domzino org"; distance:1; within:13; reference:md5,f6e81ae634bbcc309a4a5e01f20e4136; reference:url,sslbl.abuse.ch; classtype:domain-c2; sid:2023502; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2016_11_07, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2019_07_26, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)