alert ip [103.248.68.0/22,103.249.72.0/22,103.250.224.0/22,103.253.216.0/22,103.254.108.0/22,104.152.52.0/24,104.167.19.0/24,104.167.25.0/24,104.193.228.0/22,104.232.96.0/20,104.244.56.0/21,104.244.80.0/22,104.249.10.0/24,104.250.163.0/24,104.250.164.0/24,104.251.180.0/22,106.48.64.0/18,106.95.0.0/16,107.150.72.0/24,107.155.224.0/22] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 23"; 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:2400022; 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;)