alert dns $HOME_NET any -> any any (msg:"ET MALWARE APT41 KEYPLUG Related Domain in DNS Lookup"; dns.query; content:"afdentry.workstation.eu.org"; nocase; bsize:27; reference:url,www.mandiant.com/resources/apt41-us-state-governments; classtype:domain-c2; sid:2035440; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_03_11, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_11;)