alert ip [103.100.156.0/22,103.102.236.0/22,103.104.0.0/21,103.106.160.0/22,103.107.20.0/22,103.109.28.0/22,103.109.107.0/24,103.110.104.0/22,103.111.90.0/23,103.112.172.0/22,103.112.184.0/22,103.113.144.0/22,103.115.48.0/22,103.115.56.0/22,103.118.241.0/24,103.118.244.0/22,103.118.246.0/24,103.119.0.0/22,103.122.222.0/24,103.122.223.0/24] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 20"; 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:2400019; rev:4769; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag Dshield, signature_severity Minor, created_at 2010_12_30, updated_at 2026_07_15;)