alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] Trickbot/Dyre/Dridex #1"; flow:established, to_client; content:"|1703|"; depth:2; byte_test:2, >=,160, 1, relative; byte_test:2, <=,240, 1, relative; stream_size:server, <,3000; stream_size:client, <,3000; flowbits:noalert; flowbits:set, FB320221_0; classtype:trojan-activity; metadata:created_at 2017_8_11; reference:url, github.com/ptresearch/AttackDetection; sid:10001758; rev:1;)