alert dns $HOME_NET any -> any any (msg:"ET MALWARE Critroni Variant .onion Proxy Domain"; dns_query; content:"qtrudrukmurps7tc"; depth:16; nocase; fast_pattern; reference:md5,35a7f70c5e0cd4814224c96e3c62fa42; classtype:trojan-activity; sid:2020206; rev:3; metadata:created_at 2015_01_19, confidence High, signature_severity Major, updated_at 2019_08_30;)