alert ip [168.151.52.0/23,168.151.56.0/21,168.151.64.0/22,168.151.68.0/23,168.151.72.0/21,168.151.80.0/20,168.151.96.0/19,168.151.128.0/20,168.151.145.0/24,168.151.146.0/23,168.151.148.0/22,168.151.152.0/22,168.151.157.0/24,168.151.158.0/23,168.151.160.0/20,168.151.176.0/21,168.151.184.0/22,168.151.192.0/20,168.151.208.0/21,168.151.216.0/22] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 34"; 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:2400033; 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;)