alert ip [167.158.0.0/16,167.185.0.0/16,167.224.48.0/21,167.249.200.0/22,167.253.48.0/22,168.0.212.0/22,168.64.0.0/16,168.80.0.0/15,168.151.4.0/23,168.151.21.0/24,168.151.32.0/21,168.151.44.0/22,168.151.48.0/22,168.151.52.0/23,168.151.56.0/21,168.151.64.0/22,168.151.68.0/23,168.151.72.0/21,168.151.80.0/20,168.151.96.0/19] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 36"; 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:2400035; rev:4888; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag Dshield, signature_severity Minor, created_at 2010_12_30, updated_at 2026_11_11;)