alert ip [180.178.192.0/18,180.235.124.0/22,181.177.64.0/18,181.214.147.0/24,181.232.172.0/23,182.237.0.0/22,185.7.214.0/24,185.7.215.0/24,185.11.61.0/24,185.14.192.0/24,185.19.40.0/24,185.30.168.0/22,185.36.80.0/24,185.36.81.0/24,185.36.82.0/23,185.37.195.0/24,185.42.164.0/24,185.56.83.0/24,185.64.23.0/24,185.68.152.0/22] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 37"; 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:2400036; 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;)