alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE [PTsecurity] APT28 Uploader SSL connection pkt checker #1"; flow:established, to_server; content:"|1703|"; depth:2; content:"|3FF0|"; distance:1; within:2; fast_pattern; stream_size:server, >,998; stream_size:server, <,16469; stream_size:client, >,2182; stream_size:client, <,35135; flowbits:isset, FB424249_0; flowbits:unset, FB424249_0; threshold:type limit, track by_src, count 1, seconds 30; classtype:trojan-activity; metadata:created_at 2017_12_25; reference:url, github.com/ptresearch/AttackDetection; sid:11002277; rev:1;)