Questions tagged [javascript]

JavaScript or JS is an interpreted computer programming language. It was originally implemented as part of web browsers.

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Tool for JavaScript deobfuscation

I'd like to reverse engineer a JavaScript program by manually renaming minimified variable, parameter and function names. However, updating my reverse-engineered code to a newer version would be very ...
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140 views

Adobe Reader JIT Pages

I use Adobe Reader XI for a little research project. I know that Adobe use SpiderMonkey as its JS engine. When opening a .pdf file that contains JS, the JS code is compiled in runtime in parts (JIT)...
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1answer
40 views

Is there a tool to compare javascript files for differences, while also ignoring local identifier changes?

When trying to compare the difference between two minified javascript files with random identifier names, about 95% of the changes are identifiers being renamed. I would like to use a tool that ...
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78 views

Where to start with reversing a custom JavaScript VM?

I have recently ran into the most heavy JavaScript obfuscation I've seen. It is using a custom VM to execute bytecodes. I have never dealt with such obfuscation, and I am wondering where I can start ...
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238 views

How to get video file URL from Twitter

I am looking how to find the video URL of a Twitter video so I can code a converter later (using nodejs or something), but I can't figure out how to do this. I saw this but it doesn't really clear ...
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1answer
681 views

De-obfuscating code ran through JScrambler 3x via Eval() functions

I am relatively new to JS and de-obfuscation in general and I am having difficulties reversing some complicated JS. I know the code itself is obsfucated via jscrambler 3-4x and therefore is ran ...
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193 views

Javascript equivalent of JEB

In case you already know, there is a full-feature decompiler for Java/Android called JEB (https://www.pnfsoftware.com/) Some of the most important features include the ability to rename identifiers ...
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0answers
918 views

How to analyse the communication between a WebApp loaded with awesomium and the native program?

I have a Windows program that uses awesomium to display a WebApp. This WebApp communicates in some way with the client program through some native calls. I found references to window.externalHost and ...
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107 views

Intercepting packets from Electron App to keyboard in Linux

I have a USB keyboard which has an Electron app to set the macros on the keyboard. I unpacked the app.asar file, and the JS files seem to indicate that it is a ReactJS app, and is a minified ...
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60 views

Trying to replicate encryption of an android app

I was trying to replicate/copy the encryption of an android app which uses CryptoJS with sha256 encryption as having seen in the source code of the android app. fingerprinting the app, it was built ...
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174 views

How to modify JS with mitmproxy?

I am trying to reverse engineer a heavily obfuscated web application, and I would like to modify the JS to add logging. So far, I've set up mitmproxy, but I can't figure out what the best way to edit ...
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144 views

How to hook eval function in node.js

As the eval() function of JavaScript is an evil, I want to hook or monkey-patch eval() function of JavaScript in node.js. I want to intercept all arguments passed in eval() function. Please guide me ...
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Need help reversing .m4t TTML subtitles format

I am currently trying to create subtitles for some proprietary Sony software. Unfortunatly, it only recognizes Sony's own .m4t subtitles format. After some research I found that this subtitles is also ...
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21 views

How to programmatically add HTML DOM breakpoints in chromium?

I've seen from this post about Chromium DevTools that there exists the possibility to add DOM breakpoints. Given that I've a full range of elements to monitor I was trying to find a way to ...
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66 views

Movies Anywhere ID?

I'm looking to automate requesting movies from different retailers on Movies Anywhere. The URL for the request is: https://retailer.moviesanywhere.com/api/purchase/initiate?retailer={retailer}&id={...
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113 views

What is the link between g-recaptcha-response one time token and deciphered audio text?

They are multiple reports of recaptcha v2 bypass. Most of the time, the explanation is neural networks services provided by Google or ɪʙᴍ. But there is something I am failing to understand : for most ...
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69 views

Reverse engineer StackExchange winter bash

I'm curious if it's possible to reverse engineer the hat positioning and control of the StackExchange winter bash. They offer the "show controls" checkbox, but it's still all mouse-based; when you ...
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80 views

Where to identify and access the main object/closure in a JavaScript web app?

I want to add missing functionality to a web app's front end code JavaScript code. I can find the code in the browser's developer tools by setting breakpoints and stepping through. But in a large ...
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1k views

How to send and render an .html for chromecast using RAW http requests?

I am trying to RE the chrome cast protocol. I saw Koushik Dutta did RE the protocol, but didn't find any post online analyze the protocol. Moreover Google changed it a little bit since then. ...
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46 views

Bypass Javascript Debug Prevention in Firefox

I've looked around, and can't find an answer for my specific question. The closest I could find was this. I'm trying to reverse engineer some suspicious Javascript, but it repeatedly calls a debugger ...
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37 views

Deobfuscating JS Code?

I am trying to deobfuscate a highly obfuscated JS file for use to be passed in along with an HTTP POST request from my C# application. I don't know much about JS. The file I am trying to deobfuscate ...
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95 views

Reverse Engineering Instagram's Private API

I'm trying to reverse engineer Instagram Web's Private API. I have successfully managed to login into Instagram using their login endpoint using man-in-the-middle proxy and postman. I now want to send ...
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87 views

Confusion about if statement in disassembly

I recently got into reverse engineering applications for fun. Can someone please help me with this if statement. 140005914 75 38 JNZ LAB_14000594e 140005916 48 8b 4 MOV ...
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48 views

Disassembly a win Linux file

I have a file that has a compiled assembly code and being loaded into javascript code for execution. How can I “inspect” the file? I am aware of tools like immunity debugger or ollydbg but I am not ...
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29 views

Methods to alert inappropriate use of JS code

Let's say we have a JS code library that is not for sale, just internal. Of course, anyone who can access the website will be able to download that and reuse it. To avoid others to reuse that library, ...
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127 views

How to locate the function being applied on password

I am thinking of taking up ethical hacking as a hobby. So, I installed Burp Suite Community Edition and set it up with Firefox. I opened Instagram and tried to login with these details (just for ...
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2answers
229 views

Reverse Engineering Javascript - Out of Memory

I found this javascript file on one of those online movie streaming services and was interested in finding out what it does. However, after trying many deobfuscators I am still stuck. A major ...
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45 views

javascript hook comparisons

Look at this very basic javascript code: if (s=='abcd') { if (s2='cdef') { ... } } I want to hook all tests: I want to get this: (s,'==','abcd') (s2,'==','cdef') Is there a way ...
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1answer
1k views

Suspicious obfuscated javascript file

This question is related to another question made on StackOverflow. The users asks about a unknown JavaScript file which is being loaded on his website. I managed to unroll a bit of the JavaScript ...