alert ip [154.220.66.0/24,155.66.0.0/16,155.71.0.0/16,155.73.0.0/16,155.94.203.0/24,155.103.68.0/22,155.159.0.0/16,155.212.236.0/24,155.212.238.0/24,155.233.0.0/16,155.249.0.0/16,156.226.209.0/24,156.234.43.0/24,156.247.40.0/24,156.247.54.0/24,157.20.42.0/23,157.20.182.0/23,157.115.0.0/16,157.119.64.0/22,157.148.116.0/24] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 31"; 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:2400030; 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;)