alert ip [204.27.202.0/24,204.27.218.0/24,204.29.212.0/24,204.44.32.0/20,204.44.208.0/20,204.44.224.0/20,204.52.184.0/24,204.52.255.0/24,204.56.16.0/20,204.58.188.0/22,204.61.96.0/19,204.62.177.0/24,204.63.64.0/18,204.74.32.0/19,204.75.147.0/24,204.75.174.0/24,204.75.228.0/24,204.76.16.0/21,204.76.24.0/22,204.76.28.0/24] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 57"; 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:2400056; 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;)