krunker-decompiler

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krunker-decompiler

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# Krunker Decompiler

[See an example](https://gist.github.com/e9x/eea9ecb2c0ce6fe0517ff522e78d282a)

## Quickstart

1. Get the repository & dependencies

```
git clone https://github.com/e9x/krunker-decompiler.git
cd krunker-decompiler
npm install
```

2. Build the decompiler

```
npm run build
```

2. Get the game source

```
   [user@linux krunker-decompiler]$ cat ../krunker.05.12.23.js
   (function(iÌïiîií,iÏïïîiî){var iIiííìi=a3iíiíîiî,iÎìîìíì=iÌïiîií();while(!![]){try{var iIiiîîí=-parseInt(iIiííìi(0xc99))/0x1*(-parseInt(iIiííìi(0x172c))/0x2)+parseInt(iIiííìi(0xc3e))/0x3*(parseInt(iIiííìi(0x1623))/0x4)+-parseInt(iIiííìi(0x40a))/0x5+parseInt(iIiííìi(0x19b1))/0x6+-parseInt(iIiííìi(0x4888))/0x7+-parseInt(iIiííìi(0x45f8))/0x8*(-parseInt(iIiííìi(0xc7d))/0x9)+-parseInt(iIiííìi(0x2d1a))/0xa*(parseInt(iIiííìi(0x2699))/0xb);if(iIiiîîí===iÏïïîiî)break;else iÎìîìíì['push'](https://raw.githubusercontent.com/e9x/krunker-decompiler/master/iÎìîìíì['shift']());}catch(iÏiîiií){iÎìîìíì['push'](iÎìîìíì['shift']());}}}(a3iìiìïìi,0x7bbf4),function(iïíîïii){var iiïîììí=(function(){var iiíiìií=!![];return function(iîìiíiì,iîiìiìî){var iiïîiìí=iiíiìií?function(){if(iîiìiìî){var iíïîïïí=
   ```

Make sure your source:

- Is not wrapped in an anonymous function
     You can modify the source to remove the wrapper.

```js
   (function anonymous(b475796ed633d5fd0485
   ) {

(/* source goes here */)
   })
   ```

- Starts with a newline
  This is to match the real bundle. The bundle itself starts with a newline. However, this is optional.

3. Deobfuscate the source

This will deobfuscate the soruce and split each module into an individual file.

```sh
   npm run deobfuscate ../krunker.js
   ```

4. Process the modules

This will undo all minifications to the source and rename the variables.

```sh
   npm run process
   ```

You can find the result in the `processed` directory.

## Get the game source (Chromium)

1. Go to Krunker
2. Open devtools
3. Refresh the tab
4. Click on "Network"
5. Find "seek-game?hostname=krunker.io..."
6. Click on "Initiator"
7. Click on the link to "VM XXX:X"
   A VM is a JavaScript virtual machine. It's assigned a number for debugging.
8. Wait for the VM's source to load. This may take up to 5 minutes depending on your machine.
9. Right click the tab in the source viewer. It should be named "VM XXX"
10. Select "Save as..."
11. Enter a name that ends with .js, like `krunker.js`
12. Close Devtools and Krunker

### Fixing the source for use in the decompiler

Because the source is wrapped in a way that the decompiler doesn't understand, you'll have to modify it.

1. Open the source in an editor capable of handling an 8 MB file
   Like VS Code.

2. Remove the first 2 lines:

```js
   (function anonymous(b475796ed633d5fd0485
   ) {
   ```

3. Remove the last line:

```js
   })
   ```

4. Save

## How to find the Webpack entry point

Entry point is named `index.js` in the processed folder.

## How to decompile other files (Not Krunker/Webpack)

This tool can be used against other scripts that aren't bundled with Webpack. For example, you might want to use this to rename variables or deobfuscate code in a script.

1.  Build the program (if you haven't already)

```sh
    npm install
    npm run build
    ```

2.  Run the processCode script

```sh
    npm run processCode "function _0x1e3586(x,y){return x+y}exports.test = _0x1e3586;"
    ```

Ideally, the output should go to a file.

```sh
    npm run processCode "..." output.js
    ```

See output.js in the folder.

For additional usage, run `npm run processCode` without any parameters.

krunker-decompiler

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