alert dns $HOME_NET any -> any any (msg:"ET DYN_DNS DYNAMIC_DNS Query to *.myddns.me Domain"; flow:established,to_server; threshold:type limit, count 1, track by_src, seconds 120; dns.query; content:".myddns.me"; fast_pattern; nocase; endswith; classtype:bad-unknown; sid:2027287; rev:7; metadata:attack_target Client_and_Server, created_at 2019_04_25, deployment Perimeter, former_category INFO, performance_impact Low, confidence High, signature_severity Informational, tag DynamicDNS, updated_at 2024_06_11, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)