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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68
votes
9answers
65k 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'...
27
votes
4answers
14k views

What is a good tools to reverse the effects of Minify on JavaScript?

Are there any scripts and/or online tools that can reverse the effects of minification? I'm specifically looking to unminify a minified JavaScript file. Variable renaming is not a big issue, I want ...
16
votes
4answers
2k views

Obfuscating JavaScript with zero-width characters - pros and cons?

This comes from comments on a question on StackOverflow about JavaScript Variables: Why aren't ◎ܫ◎ and ☺ valid JavaScript variable names? JavaScript accepts zero-width characters as valid variable ...
12
votes
1answer
92k views

How to deobfuscate an obfuscated javascript file like this? [duplicate]

I'm having serious problems deobfuscating a JavaScript file at work. This file is inside a web app that I was left in charge to improve it. The problem is that I can do it without having access to ...
10
votes
4answers
20k 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 ...
7
votes
1answer
2k views

How do I reverse this javascript code? How is it packed?

I've a couple of questions regarding this javascript code, I found injected in one of my web pages. What is this script doing? Which tool is used to pack or obfuscate this script? How can I learn the ...
7
votes
3answers
2k views

Get used jQuery plugins from website

I want to know what jQuery plugins Facebook uses for their special scrollbar, like the two on the left, not the normal one on the right: (source) Generally, how should I go when I want to know what ...
7
votes
1answer
816 views

Reverse engineering XKCD 1190

The latest (as of now) comic is titled "Time". It's a standard-looking comic though without much action, but the picture's alt title says "Wait for it.". I waited but nothing happened (tried in Opera ...
4
votes
3answers
32k 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:...
4
votes
3answers
221 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 ...
3
votes
1answer
825 views

Possible to get the full url behind javascript button?

I am programming a little tool for patching. I found the microsoft update catalog, where all updates are stored, and I managed to look for some of them. But my problem is now that the actual download ...
3
votes
1answer
5k views

Analyze obfuscated JavaScript code? [duplicate]

I have this code var _8818;var _7347='...
3
votes
0answers
103 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)...
2
votes
2answers
330 views

How work this obfuscation, and how deobfuscate?

Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§=~[];Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§={___:++Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§,$$$$:(![]+"")[Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§],__$:++Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§,$_$_:(![]+"")[Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§],_$_:++Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§,$_$$:({}+"")[Ø Ø¡Ø¢Ø£Ø¤Ø¥Ø¦Ø§...
2
votes
2answers
3k views

Deobfuscating a javascript file

I am having a obfuscated JS file and I want to deobfuscate it (and not beautify it). I have seen answer to a similar question here and I tried de-obfuscating a the file using online version of ...
2
votes
1answer
500 views

Decoding Malware javascript [closed]

My .php and .js files have been attacked twice in a month with some JavaScript code. After going through this similar thread, I ran the JavaScript code posted there and found this decoding result. ...
2
votes
2answers
143 views

How to call an item of a Javascript array?

Say I have the following Javascript array: var _0xe984=[ '\x61\x70\x70\x6c\x79', '\x72\x65\x74\x75\x72\x6e\x20\x28\x66\x75\x6e\x63\x74\x69\x6f\x6e\x20\x28\x29\x20', '\x7b\x7d\x2e\x63\x6f\x6e\x73\...
2
votes
1answer
4k 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 ...
2
votes
1answer
175 views

LastPass Android javascript behaviour

A few weeks ago I made a proof-of-concept app demonstrating how LastPass' method of filling out creds in Chrome was insecure. For those interested the source is at https://github.com/activems/...
2
votes
0answers
2k views

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 ...
2
votes
0answers
168 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 ...
2
votes
0answers
895 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 ...
1
vote
2answers
231 views

reverse javascript crackme encryption method algorithm

This crackme contains a text input element on the screen and a button to validate The value you enter is set into _inputValue, afterwards you click on a button, the function executes, in the last ...
1
vote
1answer
150 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/...
1
vote
1answer
2k 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 ...
1
vote
1answer
113 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 ...
1
vote
1answer
465 views

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

Given this: <script>var _0x4c36=['w6rChcKeWsKXw7TCocOlNF8Kw7bCuMKdKsOWTMKjF2A=','V3PClhXDu8OCCMO5WwbCp8KhD8KVw7LDo8KOwr7CiA==','w6saBzVaIwbDk8OqHMKGwpvDgzzCixMTMMOL','...
1
vote
1answer
269 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 ...
1
vote
1answer
150 views

Likely malicous Javascript-interested in how it works

Got this interesting bit of code compressed in an email named "Install-MSOffice365-WebView-Plugin-Update-0.165.11a.exe.js" that is undoubtedly malicous, but was curious what it does and am not much of ...
1
vote
0answers
47 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 ...
1
vote
0answers
39 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 ...
1
vote
0answers
18 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 ...
1
vote
1answer
296 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 ...
1
vote
0answers
81 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="...
1
vote
1answer
621 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 ...
1
vote
2answers
77 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 ...
1
vote
0answers
43 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={...
1
vote
1answer
393 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, ...
1
vote
0answers
79 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 ...
1
vote
0answers
64 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 ...
1
vote
0answers
73 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 ...
1
vote
1answer
775 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 ...
1
vote
0answers
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. ...
0
votes
2answers
506 views

Reverse engineering a java applet using python/Javascript

I love doing online stock trading in my free time. Because I spend most of the day at my job I cannot do much of it. So, I'm thinking of making a software that will automatically place trades for me ...
0
votes
2answers
844 views

What kind of JS obfuscation is this? [closed]

I have read about de-obfuscating JS files and about multi-layered obfuscation. I have come across a file (which I have uploaded here) and it doesn't seem to be obfuscated except for lines 21 and 42. I ...
0
votes
1answer
82 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=-~-~[]...
0
votes
1answer
236 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.
0
votes
1answer
546 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 ...
0
votes
1answer
233 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 ...
0
votes
2answers
526 views

IDA Pro Alternative for JavaScript?

I am looking for a good "disassembler" for JavaScript, like IDA Pro but for JS. I am looking at a chrome extension, but the JavaScript is heavily obfuscated. After deobfuscating, I am left with ...