alert ip [199.187.48.0/21,199.196.192.0/19,199.198.160.0/20,199.198.176.0/21,199.198.184.0/23,199.198.188.0/22,199.201.238.0/24,199.201.239.0/24,199.223.0.0/20,199.230.64.0/19,199.231.8.0/21,199.233.85.0/24,199.233.96.0/24,199.241.0.0/21,199.245.138.0/24,199.246.215.0/24,199.248.32.0/20,199.248.48.0/21,199.248.56.0/22,199.248.60.0/23] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 53"; 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:2400052; rev:4770; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag Dshield, signature_severity Minor, created_at 2010_12_30, updated_at 2026_07_16;)