Arduino Leonardo Mouse Spoofing Tutorial

Today, I’ll share a method to spoof your Arduino to act like a real mouse. Let’s get started!

Tools and Preparations

1. USB Device Tree Viewer: Download from here.
2. Arduino Board Modification: Follow the steps or use this Python script to automate the process.

Important: Make these changes on a PC without Valorant installed. Fully reset Windows afterward to remove any traces left by drivers or files.

Step-by-Step Instructions

1. Identify Mouse Information

• Use this website to find details about your mouse. Enter your VID and PID.
• For example, if you have a Logitech mouse, copy "Logitech, Inc."

2. Edit boards.txt

• Go to your boards.txt file and add the following lines at the end:

  leonardo.build.core=arduino
  leonardo.build.variant=leonardo
  leonardo.build.extra_flags={build.usb_flags}
  leonardo.build.usb_manufacturer="Logitech, Inc."

• Save and re-upload your script.

3. Modify USB Descriptors

• Navigate to:

  C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino

• Open USBcore.cpp with Notepad++ and go to line 44. Update it to match your mouse’s VID and manufacturer:

  // Example update

4. Change Serial Number (Optional)

• In USBcore.cpp at line 71, update it if your mouse has specific serial values:

  0xEF = Device class
  0x02 = Device subclass
  0x01 = Device protocol
  0x100 = Version number (bcdDevice)
  Iserial = serial number

5. Adjust Power Consumption

• Open USBcore.h at line 101 and modify the power consumption to match your real mouse:

  // Example adjustment

6. Use External Power Supply

So your pc turning on routine will be like this

Connect adapter to Arduino => power on the adapter => wait 10 seconds => connect Arduino via USB to pc => turn on your pc but keep both the usb and adapter connected all the time => you're good to go but to trigger the bootloader you will have to use the button on Arduino```

7. Secure Your Script

• If distributing, send a hex file instead of the sketch file for security.
• Use a hash changer for your .exe to enhance security.

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Fully Disable COM Port and Use HID Mouse

Requirements

• Brain
• Arduino Leonardo
• USB Host Shield
• Notepad++
• Backup system restore

Steps

1. Backup Your System: Create a system restore point.

2. Open USBCore.cpp in Notepad++: Navigate to:

   C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino

3. Modify ClassInterfaceRequest:

   • Around line 373, comment out the CDC_ACM_INTERFACE check:

     // if (CDC_ACM_INTERFACE == i)
     //     return CDC_Setup(setup);

4. Modify SendInterfaces:

   • Around line 65, comment out the CDC_GetInterface line:

     // CDC_GetInterface(&interfaces);

5. Save Changes: Save USBCore.cpp.

6. Update boards.txt:

   • Add the following line at the end of the section for the Leonardo board:

     leonardo.build.extra_flags={build.usb_flags} -DCDC_DISABLED

7. Configure Arduino IDE:

   • Open Arduino IDE (version 1.8.9).
   • Go to File > Preferences.
   • Check "Show verbose output during: compilation" and "upload".

8. Upload .hex File:

   • Place the necessary library file in:

     C:\Program Files (x86)\Arduino\hardware\tools\avr\bin

   • Open Command Prompt as administrator and run:

     cd C:\Program Files (x86)\Arduino\hardware\tools\avr\bin

   • Select and upload the .hex file. If you see "avrdude.exe done. thank you.", everything went smoothly.

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Conclusion

If you have any questions, feel free to ask. I can also show you how to use HID and fully turn off your COM port. Have a great day!