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 NTLM tampering attempt

Rule Explanation

This event is generated when Microsoft Windows NTLM tampering attempted. Impact: Attempted User Privilege Gain Details: Ease of Attack:

What To Look For

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

MITRE ATT&CK Framework

Tactic:

Technique:

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

CVE

Additional Links

Rule Vulnerability

CVE Additional Information

CVE-2019-1040
A tampering vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLM MIC (Message Integrity Check) protection, aka 'Windows NTLM Tampering Vulnerability'.
Details
Severity Base Score5.9
Impact Score3.6 Exploit Score2.2
Confidentiality ImpactNONE Integrity ImpactHIGH
Availability ImpactNONE Attack VectorNETWORK
ScopeUNCHANGED User InteractionNONE
Authentication Ease of AccessHIGH
Privileges RequiredNONE