alert dns $HOME_NET any -> any any (msg:"ET INFO External IP Check Domain in DNS Lookup (ip .cn)"; dns.query; bsize:5; content:"ip.cn"; nocase; classtype:external-ip-check; sid:2047079; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_08_08, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_08, reviewed_at 2024_03_05;)