Rule History

SID: 2030525 • Source: et/open

Versions (5)

Version DetailsCurrent

Rev: 2 • Jul 15, 2020, 12:00 PM

Message:

ET INFO Possible NOP Sled Observed in Large DNS over TCP Packet M2

Rule:

alert tcp any 53 -> any any (msg:"ET INFO Possible NOP Sled Observed in Large DNS over TCP Packet M2"; flow:established,from_server; dsize:>1200; content:"|90 90 90 90 90 90 90 90|"; fast_pattern; classtype:misc-attack; sid:2030525; rev:2; metadata:affected_product Windows_DNS_server, created_at 2020_07_15, performance_impact Significant, confidence High, signature_severity Informational, tag possible_exploitation, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_20;)

Created:

Jul 15, 2020, 12:00 PM

Updated:

Jan 20, 2026, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Jan 20, 2026, 9:34 PM

Filename:

rules/emerging-info.rules