alert dns $HOME_NET any -> any any (msg:"ET INFO Observed DNS Query to .cfd TLD"; dns.query; dotprefix; content:".cfd"; nocase; endswith; fast_pattern; classtype:misc-activity; sid:2065867; rev:1; metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2025_11_20, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_20; target:src_ip;)