alert ip [218.99.0.0/16,221.128.128.0/17,222.123.0.0/16,223.26.48.0/20,223.29.226.0/24,223.155.16.0/24,223.169.0.0/16,223.254.0.0/16] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 65"; reference:url,www.spamhaus.org/drop/drop.txt; threshold:type limit, track by_src, seconds 3600, count 1; classtype:misc-attack; flowbits:set,ET.Evil; flowbits:set,ET.DROPIP; sid:2400064; rev:4719; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag Dshield, signature_severity Minor, created_at 2010_12_30, updated_at 2026_05_26;)