alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] Dyre/Trickbot/Dridex SSL connection #1"; flow:established, to_client; content:"|1703|"; depth:2; byte_test:2, >=,400, 1, relative; byte_test:2, <=,416, 1, relative; stream_size:server, <,2710; stream_size:client, <,1540; flowbits:isset, FB314917_0; flowbits:unset, FB314917_0; flowbits:set, FB314917_1; flowbits:noalert; classtype:trojan-activity; metadata:created_at 2017_8_3; reference:url, github.com/ptresearch/AttackDetection; sid:11101466; rev:2;)