alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO HTTP Connection To DDNS Domain Hopto.org"; flow:established,to_server; http.host; content:".hopto.org"; fast_pattern; endswith; reference:url,blogs.cisco.com/security/dynamic-detection-of-malicious-ddns/; reference:url,labs.umbrella.com/2013/04/15/on-the-trail-of-malicious-dynamic-dns-domains/; classtype:bad-unknown; sid:2018216; rev:5; metadata:created_at 2014_03_05, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_15;)