alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] Linux/BillGates"; flow:established, to_client; dsize:1<>9; stream_size:server, <,31; stream_size:client, <,155; flowbits:isset, FB79535_2; flowbits:unset, FB79535_2; threshold:type limit, track by_src, count 1, seconds 30; classtype:trojan-activity; metadata:created_at 2017_7_25; reference:url, github.com/ptresearch/AttackDetection; sid:11001605; rev:1;)