alert ip [204.155.80.0/21,204.155.88.0/22,204.155.92.0/23,204.155.94.0/24,204.175.0.0/16,204.178.16.0/20,204.179.64.0/20,204.179.232.0/21,204.187.192.0/19,204.187.224.0/20,204.187.240.0/21,204.194.16.0/22,204.194.40.0/21,204.194.48.0/21,204.225.153.0/24,204.225.226.0/23,204.227.32.0/19,204.232.0.0/18,204.235.16.0/20,204.235.240.0/24] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 56"; 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:2400055; 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;)