alert ip [168.198.0.0/16,168.206.0.0/16,168.227.140.0/22,169.40.135.0/24,169.129.0.0/16,169.136.224.0/19,170.67.0.0/16,170.83.232.0/22,170.113.0.0/16,170.130.10.0/23,170.130.43.0/24,170.179.0.0/16,170.247.220.0/22,171.26.0.0/16,172.70.206.0/23,172.70.214.0/23,172.94.9.0/24,172.111.128.0/17,172.247.38.0/24,173.44.0.0/19] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 36"; 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:2400035; 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;)