alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO HTTP Request to a .noip.cn domain"; flow:to_server,established; http.host; content:".noip.cn"; fast_pattern; endswith; classtype:bad-unknown; sid:2013969; rev:5; metadata:created_at 2011_11_28, confidence High, signature_severity Informational, updated_at 2020_09_25;)