alert ip [103.52.48.0/22,103.54.164.0/22,103.55.84.0/22,103.56.112.0/22,103.58.68.0/22,103.67.252.0/22,103.72.200.0/24,103.76.84.0/22,103.77.9.0/24,103.80.132.0/22,103.81.44.0/22,103.83.86.0/23,103.84.170.0/23,103.84.196.0/23,103.95.180.0/22,103.100.156.0/22,103.102.236.0/22,103.104.0.0/21,103.106.160.0/22,103.107.20.0/22] 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: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;)