alert ip [137.105.0.0/16,137.218.0.0/16,137.220.128.0/17,138.36.92.0/22,138.36.136.0/22,138.59.4.0/22,138.59.204.0/22,138.94.216.0/22,138.97.156.0/22,138.99.36.0/22,138.125.0.0/16,138.185.116.0/22,138.219.172.0/22,138.226.236.0/23,138.241.0.0/16,139.183.192.0/18,140.82.64.0/19,140.82.96.0/20,140.222.0.0/16,141.98.6.0/24] any -> $HOME_NET any (msg:"ET DROP Spamhaus DROP Listed Traffic Inbound group 28"; 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:2400027; 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;)