alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE [PTsecurity] AMMYY RAT pkt checker #0"; flow:established, to_server; content:"|3d|"; depth:1; dsize:36; stream_size:server, =,1; stream_size:client, =,37; flowbits:noalert; flowbits:set, FB301822_0; classtype:misc-activity; metadata:created_at 2017_7_12; reference:url, github.com/ptresearch/AttackDetection; sid:11001524; rev:1;)