Rule History

SID: 2009414 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 4 • Jul 30, 2010, 12:00 PM

Message:

ET DOS Large amount of TCP ZeroWindow - Possible Nkiller2 DDos attack

Rule:

alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"ET DOS Large amount of TCP ZeroWindow - Possible Nkiller2 DDos attack"; flags:A; window:0; threshold:type both, track by_src, count 100, seconds 60; classtype:attempted-dos; sid:2009414; rev:4; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)

Created:

Jul 30, 2010, 12:00 PM

Updated:

Jul 26, 2019, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Nov 17, 2025, 10:34 PM

Filename:

rules/emerging-dos.rules