alert dns $HOME_NET any -> any any (msg:"ET INFO DYNAMIC_DNS Query to a *.hornburst .com domain"; dns.query; content:".hornburst.com"; endswith; fast_pattern; nocase; reference:url,freedns.afraid.org/domain/registry/; classtype:bad-unknown; sid:2065266; rev:1; metadata:attack_target Client_and_Server, created_at 2025_10_21, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2025_10_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)