alert ip [41.71.223.0/24,41.71.224.0/24,41.71.225.0/24,41.71.226.0/24,41.71.229.0/24,41.71.230.0/24,41.71.240.0/24,41.231.240.0/22,42.0.32.0/19,42.0.128.0/17,42.128.0.0/12,42.160.0.0/12,42.208.0.0/12,43.226.17.0/24,43.228.157.0/24,43.228.159.0/24,43.229.52.0/22,43.229.240.0/22,43.231.220.0/22,43.236.0.0/16] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 4"; 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:2400003; 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;)