alert dns $HOME_NET any -> any any (msg:"ET MALWARE Critroni Variant .onion Proxy Domain"; dns_query; content:"tzsvejrzduo52siy"; depth:16; nocase; fast_pattern; reference:md5,49e988b04144b478e3f52b2abe8a5572; classtype:trojan-activity; sid:2020210; rev:3; metadata:created_at 2015_01_20, confidence High, signature_severity Major, updated_at 2019_08_30;)