alert ip [202.159.80.0/20,202.168.80.0/22,202.183.0.0/19,202.189.80.0/20,203.9.0.0/19,203.26.150.0/24,203.91.73.0/24,203.132.96.0/19,203.159.90.0/24,203.171.224.0/20,203.188.171.0/24,203.191.64.0/18,203.195.0.0/18,204.14.80.0/22,204.19.38.0/23,204.27.155.0/24,204.27.202.0/24,204.27.218.0/24,204.29.212.0/24,204.44.32.0/20] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 53"; 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:2400052; 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;)