alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"SUSPICIOUS [PTsecurity] Unusual TOR SSL Activity"; flow:established, to_server; content:"|17 03 01 00 20|"; fast_pattern; depth:5; content:"|1703|"; distance:32; within:2; stream_size:server, >,3739; stream_size:client, >,2187; stream_size:server, <,5000; stream_size:client, <,5000; flowbits:isset, FB167479_3; flowbits:unset, FB167479_3; reference:url, rules.ptsecurity.com; classtype:misc-activity; sid:11001543; rev:7;)