alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE [PTsecurity] Ursnif/Gozi SSL certificate pkt checker #0"; flow:established, to_server; content:"|1703|"; depth:2; content:"|0140|"; distance:1; within:2; fast_pattern; stream_size:server, >,934; stream_size:server, <,1844; stream_size:client, >,646; stream_size:client, <,1492; flowbits:isset, FB625629_; flowbits:unset, FB625629_; flowbits:noalert; flowbits:set, FB625629_0; classtype:trojan-activity; metadata:created_at 2018_08_19; reference:url, github.com/ptresearch/AttackDetection; sid:11003533; rev:1;)