alert ip [192.101.200.0/21,192.101.208.0/20,192.101.224.0/20,192.101.240.0/21,192.101.248.0/23,192.109.138.0/24,192.109.200.0/24,192.111.228.0/24,192.119.167.0/24,192.119.173.0/24,192.124.123.0/24,192.132.100.0/24,192.133.3.0/24,192.139.74.0/24,192.147.254.0/24,192.150.239.0/24,192.152.194.0/24,192.153.55.0/24,192.154.11.0/24,192.159.99.0/24] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 42"; 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:2400041; rev:4770; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag Dshield, signature_severity Minor, created_at 2010_12_30, updated_at 2026_07_16;)