Showing posts with label javascript. Show all posts
Showing posts with label javascript. Show all posts

Thursday 31 May 2012

JSUnpack - A Generic Javascript Unpacker

JSUnpack is an online service that can unpack different kinds of obfuscated and packed javascript source codes. It is designed for security researchers and computer professionals.

You can either supply the source code or link to the javascript file to unpack it. The site also supports uploading and unpacking of PDF, pcap, HTML, or JavaScript file.

JSUNPACK website

I hope it comes handy to you as it did to me. :)


Friday 4 May 2012

Decode The Dean Edwards Javascript Packer

Well today I had to unpack some javascript code from Dean Edwards packer and started to check how this tool works. I opened the official packer page and then thought of giving some inputs and analyzing outputs. But, wait!!! there's this "decode" button(in disabled state) and probably I can decode the stuff I was given.

I used the firebug and quickly removed one attribute each of the lower textarea and decode button. You'll have to remove the "readonly" attribute of the lower textarea and "disabled" attribute of the "docode" button. Now you can paste the packed code in the lower textarea and decode the packed code easily. Not the real reversing of the algorithm itself but works perfectly.

And you can beautify the unpacked script using some online beautifiers such as this.

I hope it helps some of you guys ;)


Tuesday 28 February 2012

Reloading The Page Using Javascript

If you wish to put a nice little Reload this page link in your page, the javascript provides a reload() method that you can use for reloading the page.

The reload() method in window.location can be used to reload the page and works well in most of the browsers. An example snippet is shown below:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<html xmlns="" xml:lang="en" lang="en">

 <title>Reload example</title>
 <meta http-equiv="content-type" content="text/html;charset=utf-8" />
 <meta name="generator" content="Geany 0.20" />

 <iframe height="300" width="300" src="http://wwwindow.location.reload(true)"></iframe>
 <a href="javascript:window.location.reload(true);">Reload this page</a>.


I hope this comes useful sometimes.


Saturday 3 September 2011

Javascript Linux Emulator

JS/Linux is a javascript linux emulator developed by Fabrice Bellard and I believe its a very creative concept. Anyway, check the javascript linux here. Isn't it fun to have linux in the browser :D