alert ip [27.100.28.0/22,27.112.32.0/19,27.122.32.0/20,27.123.208.0/22,27.124.0.0/18,27.124.17.0/24,27.124.41.0/24,27.126.160.0/20,27.146.0.0/16,27.255.85.0/24,31.43.185.0/24,31.56.52.0/23,31.56.209.0/24,31.57.184.0/24,31.57.216.0/24,31.76.32.0/24,31.129.49.0/24,31.217.252.0/24,31.222.236.0/24,36.0.8.0/21] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 3"; 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:2400002; 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;)