alert dns $HOME_NET any -> any any (msg:"ET INFO DNS Query to .onion proxy Domain (onion.city)"; dns.query; content:".onion.city"; nocase; endswith; fast_pattern; reference:url,en.wikipedia.org/wiki/Tor_(anonymity_network); classtype:misc-activity; sid:2020430; rev:9; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2015_02_16, deployment Perimeter, confidence Medium, signature_severity Informational, tag DNS_Onion_Query, updated_at 2023_06_23;)