alert dns $HOME_NET any -> any any (msg:"ET MALWARE Retefe Banker .onion Domain"; dns_query; content:"i3e5y4ml7ru76n5e"; depth:16; fast_pattern; nocase; reference:url,isc.sans.edu/diary/Retefe+is+back+in+town/20957; classtype:trojan-activity; sid:2022767; rev:3; metadata:created_at 2016_04_26, malware_family Banking_Trojan, malware_family Retefe, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_30;)