Rule Category

OS-WINDOWS -- Snort has detected traffic targeting vulnerabilities in a Windows-based operating system. This does not include browser traffic or other software on the OS, but attacks against the OS itself. (such as?)

Alert Message

OS-WINDOWS Microsoft Windows LSA authentication spoofing attempt

Rule Explanation

This rule looks for an authentication spoofing attempt that coerces Windows Server 2016 and 2019 authentication to fall back with high privileges when an attacker provides an empty/anonymous username when trying to access the server via SMB2 protocol.

What To Look For

This rule looks for an authentication spoofing attempt in vulnerable Windows Server 2016 or 2019

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

MITRE ATT&CK Framework

Tactic: Defense Evasion

Technique: Bypass User Account Control

For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org

Additional Links

Rule Vulnerability

Authentication Bypass

An Authentication Bypass occurs when there is a way to avoid providing user credentials to a system before performing restricted operations on said system.

CVE Additional Information