alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"SUSPICIOUS [PTsecurity] Unusual TOR SSL Activity FB set FB167479_1"; flow:established, to_client; content:"|17 03 01 00 20|"; fast_pattern; depth:5; content:"|1703|"; distance:32; within:2; stream_size:server, >,2523; stream_size:client, >,429; stream_size:server, <,4000; stream_size:client, <,2261; flowbits:noalert; flowbits:isset, FB167479_0; flowbits:unset, FB167479_0; flowbits:set, FB167479_1; reference:url, rules.ptsecurity.com; classtype:misc-activity; sid:11001540; rev:9;)