Interesting JavaScript Obfuscation Example, (Mon, Jun 10th)

Last Friday, one of our reader (thanks Mickael!) reported to us a phishing campaign based on a simple HTML page. He asked us how to properly extract the malicious code within the page. I did an analysis of the file and it looked interesting for a diary because a nice obfuscation technique was used in a Javascript file but also because the attacker tried to prevent automatic analysis by adding some boring code. In fact, the HTML page contains a malicious Word document encoded in Base64. HTML is wonderful because you can embed data into a page and the browser will automatically decode it. This is often used to deliver small pictures like logos:

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