alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] Malicious SSL connection (Formbook/Upatre Downloader CnC)"; flow:established, to_client; content:"|1703|"; depth:2; content:"|0140|"; distance:1; within:2; content:"|1703|"; distance:320; within:2; content:"|04A0|"; distance:1; within:2; fast_pattern; stream_size:server, >,5000; stream_size:server, <,10069; stream_size:client, >,424; stream_size:client, <,905; flowbits:isset, FB346039_1; flowbits:unset, FB346039_1; flowbits:unset, FB346039_2; flowbits:set, FB346039_3; classtype:trojan-activity; metadata:created_at 2017_9_23; reference:url, github.com/ptresearch/AttackDetection; sid:11001981; rev:1;)