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

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DETECTION OVERVIEW

SIP Brute Force

Risk Factors

Session Initiation Protocol (SIP) is a protocol associated with Voice over IP (VoIP). SIP, which allows administrators to remotely run commands on other devices, is a popular target for attackers. Brute force attacks on SIP are low cost and relatively easy to perform. Even though this type of brute force attack is noisy, it can be highly effective due to the commonality of weak and repurposed passwords.

The system might change the risk score for this detection.

Kill Chain

Lateral Movement
Detection diagram
Next in Lateral Movement: Spike in RDP Sessions

Description

$source had a high ratio of errors with the SIP response 403 status code (Forbidden). Investigate to determine if $source is compromised and attempting to locate valid credentials to establish a SIP session, imitate users, or facilitate fraud.

Attack Background

An attacker looking to remotely run commands on target devices over Session Initiation Protocol (SIP) must first acquire valid credentials. A brute force attack is a method for guessing a weak user password. Brute force attacks can occur manually through trial and error or automation tools.

Mitigation Options

Limit the number of Session Initiation Protocol (SIP) login attempts and then block users that exceed this number

Implement strong authentication methods for remote access services

Implement network segmentation and firewall policies to limit how devices can communicate and enforce security zones

Review access controls to ensure that only necessary users can connect to remote access services with SIP

Review authentication methods and enforce policies for secure credential creation and multi-factor authentication

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.

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

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News

Detections

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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.

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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.

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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.

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