alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"REMOTE [PTsecurity] DarkTrack Successful Connection"; flow:established, to_client; dsize:6; stream_size:server, >,0; stream_size:server, <,54; stream_size:client, >,0; stream_size:client, <,650; content:"|0100 0000|"; fast_pattern; depth:4; flowbits:isset, FB582528_0; flowbits:unset, FB582528_0; reference:url, rules.ptsecurity.com; classtype:trojan-activity; sid:11003005; rev:7;)