alert ip [102.135.105.0/24,102.211.56.0/22,102.216.254.0/23,102.220.112.0/22,102.220.160.0/22,102.240.1.0/24,103.1.43.0/24,103.3.212.0/22,103.4.32.0/22,103.5.116.0/22,103.6.36.0/22,103.7.198.0/23,103.12.220.0/22,103.13.140.0/22,103.19.116.0/22,103.19.188.0/22,103.20.72.0/22,103.20.156.0/22,103.23.12.0/22,103.25.88.0/22] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 18"; 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:2400017; 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;)