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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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Detecting what causes edited Javascript file to crash entire browser tab

I'm currently trying to debug a Javascript game that's been made with Haxe 3.4.7. When I'm trying to override the .js file locally, my entire browser seems to crash, or simply not load. I'm thinking ...
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13 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
23 views

replace variable references with its values at once in javascript file

I'm trying to de-obfuscate a Javascript file: Javascript Obfuscated File I have already de-obfuscated the code but it's still hard to read. As you can see in the code below there is a huge list of ...
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1answer
85 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
41 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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32 views

Determining correct javascript file deobfuscation

I am trying to reverse engineer a game which sends it's data through an Obfuscate and DeObfuscate function to protect itself. The code base is 50k+ lines long (pretty printed), and eval techniques ...
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0answers
21 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
36 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
56 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
126 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
279 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
185 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
67 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 ...
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3answers
169 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
1k 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
3k 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
843 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
41 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
249 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
60 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
476 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
245 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
413 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 ...
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0answers
1k 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 ...
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0answers
84 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
193 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 ...
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2answers
135 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
277 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
140 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
22k 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
559 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
1k 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 ...
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1answer
2k 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
95 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
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 ...
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1answer
3k 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
128 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 ...
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0answers
157 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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2answers
440 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 ...
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0answers
72 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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1answer
172 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/...
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2answers
740 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 ...
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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 ...
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1answer
187 views

Trying to deobfuscate multi layered javascript [closed]

Can someone deobfuscate this code? I am not getting any way to deobfuscate this. Unable to paste it over here as it over passed 30,000 word limit. http://pastebin.com/V327Q8Hg Thanks
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1answer
1k views

Trying to decrypt javascript code [duplicate]

Is it possible to deobfuscate/decrypt this javascript code? ;eval(function(w,i,s,e){var lIll=0;var ll1I=0;var Il1l=0;var ll1l=[];var l1lI=[];while(true){if(lIll<5)l1lI.push(w.charAt(lIll));else if(...
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1answer
79k 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 ...
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1answer
582 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
875 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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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. ...
2
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1answer
4k views

Analyze obfuscated JavaScript code? [duplicate]

I have this code var _8818;var _7347='...