alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"SUSPICIOUS [PTsecurity] Unusual TOR SSL Activity"; flow:established, to_server; content:"|1703 01 0220|"; depth:5; fast_pattern; stream_size:server, >,3630; stream_size:server, <,4407; stream_size:client, >,1813; stream_size:client, <,3102; flowbits:isset, FB447357_3; flowbits:unset, FB447357_3; reference:url, rules.ptsecurity.com; classtype:misc-activity; sid:11002434; rev:5;)