alert ip [101.99.94.0/24,101.99.95.0/24,101.134.0.0/15,101.192.72.0/22,101.192.84.0/22,101.193.104.0/22,101.193.116.0/22,101.203.128.0/19,102.129.152.0/24,102.134.32.0/19,102.135.105.0/24,102.135.106.0/24,102.220.112.0/22,102.220.160.0/22,102.240.1.0/24,103.1.43.0/24,103.3.212.0/22,103.4.32.0/22,103.5.116.0/22,103.6.36.0/22] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 20"; 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:2400019; 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;)