alert tcp $HOME_NET any -> $EXTERNAL_NET [53, 443] (msg:"MALWARE [PTsecurity] Bunitu.Proxy"; flow:established, to_server; dsize:37; content:"|00|"; offset:1; depth:1; stream_size:server, =, 51; stream_size:client, =,52; flowbits:isset, FB70820_1; classtype:trojan-activity; metadata:created_at 2017_8_26; reference:url, github.com/ptresearch/AttackDetection; sid:11000342; rev:4;)