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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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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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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1answer
62 views

automatically find the object “this” refers to in js

Im quite new to javascript and sometimes I find it really hard to find what object a keyword 'this' refers to. Is there a code editor that is able to do that for me? Or any other advice that could ...
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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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1answer
91 views

Any good places to learn about JS de-obfuscation?

I am trying to make a bot on a specific website, so I have to reverse a lot of JS scripts. The reversing it self is not that hard but the de-obfuscation is. Lots of the scripts are obfuscated with ...
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1answer
59 views

How to clean obfuscated code from fake if statements?

I am trying to deobfuscate javascript code. Firstly I extracted strings from big array. Then I saw many parts like this There is only one line of code which makes sense. Is there any Node.js cleaner ...
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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 ...
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0answers
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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1answer
85 views

What's wrong with my mitm to support rr commands with gdbserver on IDA?

First of here is the gdb remote protocol doc. The idea of the below script is the following - you enter an actual command (one that will be send as a direct packet see packets) in the gdb window then ...
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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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0answers
96 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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0answers
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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1answer
1k views

How can I modify or decompile Hermes JS bytecode?

Since React Native 0.60.4 developers can opt-in to use the Hermes JS Engine. This generates an index.android.bundle binary that contains Hermes JS bytecode. The Hermes documentation mentions hbcdump ...
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0answers
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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0answers
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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1answer
44 views

What browser do during initial web page request?

I am trying to understand why if I do fetch() 4 times on the active web page, after the fifth fetch server returns response that I am a "robot" I am using google chrome I go the following ...
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9answers
76k views

Analyzing highly obfuscated JavaScript

I was recently analyzing a web page that contained some highly obfuscated JavaScript - it's clear that the author had went through quite a bit of effort to make it as hard to understand as possible. I'...
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0answers
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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0answers
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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1answer
46 views

Load a *.dylib or *.so object into the Javascript V8 runtime?

I was reading this Frida release page and noticed it made the following reference: Short of writing the whole agent in C, one could go ahead and build a native library, and load it using Module....
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0answers
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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0answers
175 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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1answer
470 views

De-obfuscate JS code [closed]

I came across a script that converts font files from one type to another (i.e. WOFF to TTF, etc). I would like to understand it and incorporate some of the code into a personal project. The script ...
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1answer
241 views

Is it possible to completely reverse this code?

i have this code i'm trying to deobfuscate https://pastebin.com/g5mHpWE4 I used https://beautifier.io/ and http://www.jsnice.org/ but the result is still not good, current code: https://pastebin.com/...
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1answer
1k views

decrypt config.bin file from Huawei B5328 router i have source files

Hello i need somehelp in decrypting the file config.bin generated by the page backup_setting.html from huawei B5328 router , i have access to all files in the router even the www files hosted on the ...
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1answer
3k views

How can I deobfuscate this javascript code

I am trying to deobfuscate this javascript code, but I don't know how it was created. Can you please tell me what the mechanism or the function is that generate such characters in javascript? É=-~-~[]...
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0answers
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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0answers
54 views

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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4answers
22k views

Try to deobfuscate multi layered javascript

According to the techy zilla blog It will be much harder to deobfuscate code that has been obfuscated using multiple obfuscating algorithms. According to them, jsbeautifier can't fix this obfuscated ...
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0answers
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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0answers
119 views

deobfuscating/decompiling extremely complicated javascript [closed]

I am working with some extremely complicated JavaScript. It is around 70,000 lines long and sections of the code look like this U2xx.l11="0x78920d50";m2xx.r9G="11";b2xx.v3y="0x744ebc37";P2xx.K5h="...
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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
240 views

WebSocket debugging in Javascript app gives “401 Unauthorized” [closed]

I'm attempting to reverse engineer a private API used by an Android app that makes use of WebSockets. These requests are made from JavaScript inside a WebView. I use Charles to intercept both HTTP ...
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1answer
1k views

How to copy video address from tweet?

Twitter has an option to right-click on a video and "copy video address" but this button seems to be broken as it doesn't copy anything to the clipboard, even after I disable Ghostery/adblock. I ...
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1answer
605 views

Is v8's --print-bytecode safe?

I just saw this post, and I was wondering if it's safe to get v8 bytecode in that fashion with --print-bytecode.
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1answer
2k views

Analyzing and deobfuscating complex JS code [duplicate]

I am looking to reverse engineer a very ugly piece of JS found here. As far as I can tell, this script generates and sets some cookies on my browser that identify it on the site. Deobfuscating it ...
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1answer
832 views

How do you un-obfuscate JS code that is evaluating your browser environment?

Given this: <script>var _0x4c36=['w6rChcKeWsKXw7TCocOlNF8Kw7bCuMKdKsOWTMKjF2A=','V3PClhXDu8OCCMO5WwbCp8KhD8KVw7LDo8KOwr7CiA==','w6saBzVaIwbDk8OqHMKGwpvDgzzCixMTMMOL','...
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1answer
7k views

Frida manipulating arguments - Android

I've attempting to learn how to use Frida to instrument android app, just for person interest. So far I've managed to get my environment set up with a physical android tablet and I can successfully ...
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2answers
126 views

How can a Javascript file drop .exe written in Visual Basic without network communication?

I am analyzing a malicious JS file, which is obfuscated in a way that I could not de-obfuscate. When I executed it in a virtual machine and spectated process changes, I noticed that a new executable ...
4
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3answers
282 views

Obfuscated code analysis - can unused variables be ignored?

I am analyzing a malicious javascript. The code is encoded and obfuscated in a way that I did not manage to even partially deobfuscate yet and it is filled with long strings. In order to simplify the ...
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1answer
4k views

Is deobfuscation of my javascript code hard or easy?

I am trying to protect my app code from theft. Since most of it is written in javascript I had to use many obfuscation techniques to make it incomprehensible. I have written a very small piece of ...
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1answer
14k views

How do I decode this JavaScript code? [duplicate]

Each file starts with the same function: (function(_0x128f83, _0x1ae5b9) { var _0x1b5471 = function(_0x339be5) { while (--_0x339be5) { _0x128f83['push'](_0x128f83['shift']()); ...
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1answer
3k views

How decrypt hexadecimal javascript code? [closed]

Someone here already had success to deobfuscate 100% a "hexadecimal" Javascript code? E.g.: var _0x22bc92 = function() { var _0x26938d = !![]; return function(_0x100751, _0x54d399) { ...
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0answers
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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1answer
616 views

Map an obfuscated javascript file to the original

Among other approaches, there are ways to "prettify" obfuscated javascript. But most of such approaches are geared towards someone trying to understand code that's not their own (e.g. from a website, ...
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0answers
114 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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3answers
53k views

How to get Video URL from embedded Link in Twitter

I'm trying to get the Video URL of ( https://twitter.com/i/videos/823649890379120640?embed_source=facebook ) I tried going over the source code but it give the same URL link <meta property="og:...
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1answer
315 views

deobfuscating javascript injected into Wordpress

Found a WP site (not mine) with lovely obfuscated code injected into the footer so I've been trying to de-obfuscate it. I ran it through unpacker, then converted hex to ASCII, then un-minified to ...