alert dns $HOME_NET any -> any any (msg:"ET MALWARE PlugX DNS Lookup"; dns.query; content:"sery.brushupdata.com"; nocase; bsize:20; reference:url,twitter.com/KorbenD_Intel/status/1346193938277949443; reference:md5,a587a2af22c7e18a0260cab5c06d980d; classtype:domain-c2; sid:2031520; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_01_12, deployment Perimeter, malware_family PlugX, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_12;)