alert dns $HOME_NET any -> any any (msg:"ET INFO Observed DNS Query to Dynamic DNS Domain (dedyn .io)"; dns.query; dotprefix; content:".dedyn.io"; nocase; endswith; classtype:bad-unknown; sid:2065030; rev:1; metadata:attack_target Client_and_Server, created_at 2025_10_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_10_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)