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 User Profile Service privilege escalation attempt

Rule Explanation

This rule looks for a malicious use of a file in System32 that contains two junctions in the path. Further, it attempts to find the required NT functions to exploit said junctions.

What To Look For

This rule alerts on malicious traffic attempting to download a Window's privilege escalation.

Known Usage

Public information/Proof of Concept available

False Positives

No known false positives


Cisco Talos Intelligence Group

Rule Groups

No rule groups


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

Windows User Profile Service Elevation of Privilege Vulnerability.
Severity Base Score7.0
Impact Score5.9 Exploit Score1.0
Confidentiality ImpactHIGH Integrity ImpactHIGH
Availability ImpactHIGH Attack VectorLOCAL
ScopeUNCHANGED User InteractionNONE
Authentication Ease of AccessHIGH
Privileges RequiredLOW

MITRE ATT&CK Framework

Tactic: Privilege Escalation

Technique: File System Permissions Weakness

For reference, see the MITRE ATT&CK vulnerability types here: