alert dns $HOME_NET any -> any any (msg:"ET MALWARE Possible Winnti DNS Lookup"; dns.query; content:".dnslookup.services"; nocase; endswith; reference:url,www.welivesecurity.com/2020/01/31/winnti-group-targeting-universities-hong-kong/; classtype:targeted-activity; sid:2029347; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_01_31, deployment Perimeter, malware_family Winnti, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_28;)