alert dns $HOME_NET any -> any any (msg:"ET POLICY DNS Query to DynDNS Domain *.dynns .com"; dns.query; content:".dynns.com"; nocase; endswith; reference:url,www.noip.com/support/faq/free-dynamic-dns-domains/; classtype:bad-unknown; sid:2028717; rev:1; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2019_10_14, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2019_10_14;)