alert dns $HOME_NET any -> any any (msg:"ET INFO DYNAMIC_DNS Query to a *.2bd .net domain"; dns.query; content:".2bd.net"; endswith; fast_pattern; nocase; reference:url,dnsexit.com/domains/free-second-level-domains/; classtype:bad-unknown; sid:2066706; rev:1; metadata:attack_target Client_and_Server, created_at 2026_01_12, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2026_01_12, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)