alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO HTTP Request to Suspicious *.ryukyu Domain"; flow:established,to_server; http.host; content:".ryukyu"; fast_pattern; endswith; reference:url,www.spamhaus.org/statistics/tlds/; classtype:bad-unknown; sid:2027878; rev:4; metadata:created_at 2019_08_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, updated_at 2020_09_17;)