alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"SUSPICIOUS [PTsecurity] Unusual TOR SSL Activity FB set FB167479_3"; flow:established, to_client; content:"|17 03 01 00 20|"; fast_pattern; depth:5; content:"|1703|"; distance:32; within:2; stream_size:server, >,3739; stream_size:client, >,1601; stream_size:server, <,4856; stream_size:client, <,2261; flowbits:noalert; flowbits:isset, FB167479_2; flowbits:unset, FB167479_2; flowbits:set, FB167479_3; reference:url, rules.ptsecurity.com; classtype:misc-activity; sid:11001542; rev:9;)