Security

Intelligent Defense against Malicious JavaScript Code

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Executive Summary

JavaScript is a popular scripting language for creating dynamic and interactive web pages. Unfortunately, JavaScript also provides the ground for web-based attacks that exploit vulnerabilities in web browsers and unnoticeably infect users with malicious software. Regular security tools, such as anti-virus scanners, increasingly fail to fend off this threat, as they are unable to cope with the rapidly evolving diversity and obfuscation of these JavaScript attacks. In this paper, the authors present Cujo, a learning-based system for detection and prevention of JavaScript attacks. Embedded in a web proxy, Cujo transparently inspects web pages and blocks the delivery of malicious JavaScript code. A lightweight static and dynamic analysis is performed, which enables learning and detecting malicious patterns in the structure and behavior of JavaScript code.

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