alert dns $HOME_NET any -> any any (msg:"ET MALWARE Critroni Variant .onion Proxy Domain"; dns.query; content:"3fdzgtam4qk625n6"; depth:16; nocase; fast_pattern; reference:md5,adb0de790bd3fb88490a60f0dddd90fa; classtype:trojan-activity; sid:2020358; rev:4; metadata:created_at 2015_02_04, confidence High, signature_severity Major, updated_at 2020_09_01;)