alert dns $HOME_NET any -> any any (msg:"ET INFO DYNAMIC_DNS Query to *.dyndns. Domain"; dns.query; content:".dyndns."; nocase; content:!"update.dyndns.org"; depth:17; content:!"checkip.dyndns.org"; depth:18; classtype:misc-activity; sid:2012758; rev:8; metadata:created_at 2011_05_02, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_09;)