alert tcp $EXTERNAL_NET 443 -> $HOME_NET any (msg:"ET MALWARE TDLv4 SSL Cert"; flow:established,from_server; content:"|55 04 03|"; content:"|0a|*.city.com"; distance:1; within:11; content:"|55 04 07|"; content:"|06|Cities"; distance:1; within:7; content:"|55 04 0a|"; content:"|0a|State Corp"; distance:1; within:11; classtype:trojan-activity; sid:2018256; rev:1; metadata:attack_target Client_Endpoint, created_at 2014_03_12, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2019_07_26;)