alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] TrickBot.Spy SSL connection pkt checker #1"; flow:established, to_client; content:"|1703|"; depth:2; content:"|01A0|"; distance:1; within:2; fast_pattern; stream_size:server, >,1699; stream_size:server, <,3797; stream_size:client, >,374; stream_size:client, <,1657; flowbits:noalert; flowbits:isset, FB566923_0; flowbits:unset, FB566923_0; flowbits:set, FB566923_1; classtype:trojan-activity; metadata:created_at 2018_05_11; reference:url, github.com/ptresearch/AttackDetection; sid:11002940; rev:1;)