alert ip [206.136.208.0/20,206.143.128.0/17,206.170.48.0/21,206.170.56.0/22,206.175.0.0/17,206.175.128.0/17,206.183.160.0/21,206.195.224.0/19,206.197.77.0/24,206.197.166.0/24,206.197.171.0/24,206.197.226.0/24,206.209.48.0/20,206.209.80.0/20,206.209.192.0/20,206.221.0.0/20,206.221.96.0/20,206.221.192.0/20,206.223.33.0/24,206.224.160.0/19] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 61"; 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:2400060; rev:4719; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag Dshield, signature_severity Minor, created_at 2010_12_30, updated_at 2026_05_26;)