alert dns $HOME_NET any -> any any (msg:"ET MALWARE CloudAtlas APT Related DNS Lookup (avito-service .net)"; dns.query; bsize:17; content:"avito-service.net"; nocase; reference:url,www.facct.ru/blog/cloud-atlas; classtype:domain-c2; sid:2049728; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_12_19, deployment Perimeter, deprecation_reason Age, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_18, reviewed_at 2024_03_18; target:src_ip;)