Today's web browser environments provide powerful scripting functionality to create feature-rich, user friendly, and customizable browsing experiences through dynamic web content. Unfortunately, this also creates an excellent environment for cybercrooks to create web scripts that, though appearing innocuous, are actually carrying malicious code inside, designed to ultimately infect the user's computer. Malicious JavaScript may be conducting reconnaissance on the PC, checking for browser, availability and versions (or patch level) of plug-ins such as Adobe Reader, Flash Player, or .NET Framework, to determine the next steps of the attack that will ultimately gain control of the PC. This paper outlines the issues in detail and discusses how McAfee approaches the problem.
January 8, 2014
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