alert dns $HOME_NET any -> any any (msg:"ET POLICY DNS Query to .onion proxy Domain (torstorm.org)"; dns.query; content:".torstorm.org"; fast_pattern; endswith; nocase; reference:url,en.wikipedia.org/wiki/Tor_(anonymity_network); classtype:policy-violation; sid:2020618; rev:6; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2015_03_04, deployment Perimeter, confidence Medium, signature_severity Informational, tag DNS_Onion_Query, updated_at 2020_09_17;)