alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] TorrentLocker TOR SSL pkt check #4"; flow:established, to_client; content:"|1703|"; depth:2; byte_test:2, =,24, 1, relative; content:"|1703|"; distance:0; stream_size:server, <,3137; stream_size:client, <,2001; flowbits:isset, FB251545_3; flowbits:unset, FB251545_3; threshold:type limit, track by_src, count 1, seconds 30; classtype:trojan-activity; metadata:created_at 2017_7_26; reference:url, github.com/ptresearch/AttackDetection; sid:11001618; rev:1;)