ExtraHop named a Leader in the 2025 Forrester Wave™: Network Analysis And Visibility Solutions

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DETECTION OVERVIEW

LLMNR Poisoning

Risk Factors

LLMNR is an older and vulnerable protocol that is typically disabled, so the likelihood of an attack is low. However, if an attacker impersonates a proxy or harvests user credentials, they can ultimately gain privileged information or unauthorized access to assets on your network.

The system might change the risk score for this detection.

Category

Exploitation
Detection diagram
Next in Exploitation: Log4Shell JNDI Injection Attempt

Attack Background

When a DNS request for a hostname cannot be resolved or no DNS server is available (1), some clients will broadcast a query to all local devices over LLMNR (2). If an attacker is listening, they can respond and impersonate the requested host (3). If the host is an authenticated resource, that client might send user credentials to the attacker.

Mitigation Options

Quarantine the attacking and victim devices if they are compromised

If LLMNR is not required for your Windows environment, disable LLMNR in local security settings or by group policy

Ensure secure password policies are applied to your network devices to offset potential damage in the aftermath of an attack

MITRE ATT&CK ID

Associated content

Announcing The Forrester Wave™: Network Analysis And Visibility Solutions, Q4 2025

Network analysis and visibility solutions remain underrepresented in enterprises. Find out why in this preview of a new Wave report.

Report

ExtraHop® Named a Leader in First-Ever Gartner® Magic Quadrant™ for Network Detection and Response — ExtraHop

ExtraHop® Named a Leader in First-Ever Gartner® Magic Quadrant™ for Network Detection and Response

News

Detections

Visit this resource for more information.

Docs

The 2025 ExtraHop Global Threat Landscape Report: The Alarming Reality of Threat Actor Dwell Time and Deeper Network Access — ExtraHop

This analysis exposes the critical link between an organization's lack of internal visibility and the escalating cost of compromise, demanding an urgent re-evaluation of how core business assets are protected.

Blog

ExtraHop RevealX MITRE ATT&CK Coverage 2024 — ExtraHop

Learn why you need to be wary of the claims certain network detection and response providers make about their coverage against the MITRE ATT&CK framework.

Blog

MITRE ATT&CK - Network Detection & Response with RevealX — ExtraHop

Learn how NDR from RevealX helps security teams detect and investigate more adversary TTPs in the MITRE ATT&CK framework than rule-based tools.

External
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