alert tcp $EXTERNAL_NET [443,$HTTP_PORTS] -> $HOME_NET any (msg:"ET INFO tor2www .onion Proxy SSL cert"; flow:established,from_server; content:"|55 04 03|"; content:"*.tor2www."; nocase; distance:2; within:10; classtype:misc-activity; sid:2018538; rev:3; metadata:attack_target Client_Endpoint, created_at 2014_06_06, deployment Perimeter, confidence High, signature_severity Informational, tag TOR_Proxy, updated_at 2023_04_20;)