Man-in-the-Browser (MitB)

Summary

Man-in-the-Browser (MitB) is a sophisticated form of malware attack that intercepts and manipulates communications between a user’s web browser and the intended web application, often to steal sensitive information or alter transactions without detection.

Key Characteristics

• Operates as a Trojan or malware injected into the browser or as a browser extension.
• Intercepts and modifies web page content and user inputs in real-time.
• Targets online banking, e-commerce, and other sensitive web applications.
• Can bypass traditional security measures like SSL/TLS encryption by operating within the browser.
• Often remains undetected by users and security software due to its stealthy nature.

Defensive Controls

• Use of multi-factor authentication (MFA) to reduce the impact of stolen credentials.
• Deploy endpoint security solutions with advanced malware detection capabilities.
• Implement browser isolation or sandboxing to limit the execution of unauthorized code.
• Regularly update browsers and plugins to patch vulnerabilities.
• Employ transaction verification methods such as out-of-band confirmation.

Related Security Solutions

Anti-malware and endpoint detection and response (EDR) tools help identify and block MitB malware. Web application firewalls (WAFs) and secure browser environments can reduce exposure. Behavioral analytics and anomaly detection systems assist in identifying suspicious transaction modifications caused by MitB attacks.