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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40 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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66 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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80 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 ...
2
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1answer
28 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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47 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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55 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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1answer
135 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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0answers
67 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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185 views

Connect and extract live raw data from bluetooth devices

I recently bought a bunch of bluetooth devices which includes fitness bands, thermometers, room temp. But I've seen that most of them don't appear in the mobile's discoverable list but connects ...
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1answer
173 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
222 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

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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92 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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1answer
62 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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0answers
48 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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1answer
875 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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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 ...
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1answer
531 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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0answers
109 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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34 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
179 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
641 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
438 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
1k 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
693 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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2answers
100 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
253 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
3k 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
10k 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
2k 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
54 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
523 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
100 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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1answer
692 views

would be possible to deobfuscate javascript code? [closed]

the code is: https://pastebin.com/wTkB81v4 would be possible to deobfuscate the code to get the original code?
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1answer
295 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 ...
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2answers
642 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 ...
3
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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 ...
3
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0answers
125 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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2answers
288 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 ...
2
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2answers
152 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\...
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2answers
420 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§...
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1answer
156 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 ...
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3answers
45k 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
1k 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 ...
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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 ...
2
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1answer
6k 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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1answer
112 views

Census world and US population clocks

I'm trying to figure out the formula used by the US Census Department's world and US population clocks here: https://www.census.gov/popclock/?intcmp=home_pop I'm pretty sure they're using a browser-...
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0answers
65 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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1answer
7k views

How to deobfuscated javascript?

How to deobfuscate javascript file, i have a javascript code are deobfuscate . Code: http://pastebin.com/zFH2GidN Help me and thanks you.
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1answer
131 views

Reverse Engineer Joomla fabrik calculator

I am wondering if it is possible to reverse engineer the calculator on this url: http://www.contrelec.co.uk/index.php/en/motor-full-load-current-estimator-kw It appears to be a Joomla site with the ...