alert ip [199.166.214.0/23,199.175.142.0/23,199.175.144.0/21,199.175.152.0/22,199.175.156.0/24,199.178.64.0/19,199.178.144.0/20,199.178.160.0/21,199.178.168.0/23,199.180.8.0/22,199.180.12.0/23,199.180.14.0/24,199.184.0.0/21,199.184.8.0/22,199.184.12.0/23,199.184.82.0/24,199.184.223.0/24,199.185.144.0/20,199.186.26.0/23,199.187.16.0/21] 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:4813; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag Dshield, signature_severity Minor, created_at 2010_12_30, updated_at 2026_08_28;)