alert tcp [167.179.117.50,167.99.142.162,168.144.112.115,171.25.158.113,171.25.158.50,171.25.193.131,171.25.193.132,171.25.193.20,171.25.193.234,171.25.193.235] any -> $HOME_NET any (msg:"ET TOR Known Tor Exit Node Traffic group 21"; reference:url,check.torproject.org/torbulkexitlist; threshold:type limit, track by_src, seconds 60, count 1; classtype:misc-attack; flowbits:set,ET.TorIP; sid:2520020; rev:6317; metadata:affected_product Any, attack_target Any, deployment Perimeter, tag TOR, signature_severity Informational, created_at 2008_12_01, updated_at 2026_07_16;)