alert dns $HOME_NET any -> any any (msg:"ET MALWARE ASNAROK CnC Domain in DNS Lookup"; dns.query; bsize:23; content:"sophosproductupdate.com"; nocase; reference:url,news.sophos.com/en-us/2020/04/26/asnarok/; classtype:command-and-control; sid:2030033; rev:3; metadata:attack_target Networking_Equipment, created_at 2020_04_27, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_25;)