alert tcp $EXTERNAL_NET 443 -> $HOME_NET any (msg:"ET MALWARE Greencat SSL Certificate"; flow:established,from_server; content:"|55 04 08 13 05|Ocean"; fast_pattern; classtype:trojan-activity; sid:2016812; rev:5; metadata:attack_target Client_Endpoint, created_at 2013_05_03, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2019_10_08;)