What can you do with deobfuscating JavaScript code?
Deobfuscating JavaScript code is mostly useful if you try to detect bugs, or in the specific case of malicious code that was planted on an infected website in order to find out what it does. However, if you are interested in this particular implementation of the technique, which is admittedly quite clever and detailed, read on.
How to deobfuscate the JavaScript code of a phishing website?
Be warned: the code responsible for it is heavily obfuscated and requires some painfully tedious reconstruction in order to read it… So, let’s get into it! Here is what we can find out by deobfuscating the JavaScript code on the page: How the obfuscation works How the window-in-window trick was implemented
How to deobfuscate JavaScript code in netsparker?
So, in the next section, we’ve linked each section of obfuscated code to its de obfuscated counterpart. If you don’t immediately understand a piece of code, simply scroll to the end of the section and click on deobfuscate. This will make your browser jump to the next step in the deobfuscation process.
How does an IIFE work in JavaScript?
An IIFE is a JavaScript function that is immediately executed. This works by first encapsulating the function in parentheses and then calling it with or without parameters.
How to analyze highly obfuscated JavaScript in reverse?
Looking at the code, there were a few methods that were designed to be confusing, and then several KB of strings like this that would eventually be decoded as javascript and executed: 22=”;4kqkk;255ie;35bnh;4mehn;2lh3b;7i29n;6m2jb;7jhln;562ik…”
How does jsdetox analyze highly obfuscated JavaScript?
JSDetox intercepts calls like “eval ()” or “document.write ()” (what you did by hand) and displays what would be executed, allowing further analysis. The HTML DOM emulation allows the execution of code that interacts with an HTML document, e.g.: