alert tcp [172.81.177.173,172.86.117.246,172.86.91.90,173.237.206.68,173.255.198.243,176.118.193.33,176.65.134.8,176.65.148.133,176.65.148.3,176.65.149.105] any -> $HOME_NET any (msg:"ET TOR Known Tor Exit Node Traffic group 25"; reference:url,check.torproject.org/torbulkexitlist; threshold:type limit, track by_src, seconds 60, count 1; classtype:misc-attack; flowbits:set,ET.TorIP; sid:2520024; rev:6363; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag TOR, signature_severity Informational, created_at 2008_12_01, updated_at 2026_08_31;)