Creating a USB Rubber Ducky from a Digispark Attiny 85

Step One — Install Digispark Drivers

• Go to the Digispark repo at https://github.com/digistump/digistumparduino/releases
• Download Digistump.Drivers.zip for your operating system
• Extract and run DPinst.exe (x86) or DPinst64.exe (x64)

Step Two — Download and Install the Arduino IDE

• Download from https://www.arduino.cc/en/software
• Install

Step Three — Configure Arduino IDE for the Digispark

Add the Digispark board manager index

Within the Arduino IDE, navigate to:

• File > Preferences > Additional boards manager URLs
• Paste: http://digistump.com/package_digistump_index.json
• Click OK

Install the Digispark boards

Within the Arduino IDE, navigate to:

• Tools > Boards > Board Manager
• Filter for and select Digistump AVR Boards by Digistump and click install

Set Digispark as default

Within the Arduino IDE, navigate to and select:

• Tools > Boards > Digistump AVR Board > Digispark (Default — 16.5mhz)

Step Four — Create Your First Rubber Ducky Script

Create a new sketch with File > New sketch, then paste the following code:

#include "DigiKeyboard.h"
void setup() {
  // No setup scripting is required, but this function is needed
}
void loop() {
  // This is generally not necessary but with some older systems it seems to
  // prevent missing the first character after a delay:
  DigiKeyboard.sendKeyStroke(0);

  // Open a command prompt
  DigiKeyboard.sendKeyStroke(KEY_R, MOD_GUI_LEFT);
  DigiKeyboard.delay(500);
  DigiKeyboard.println("cmd");
  DigiKeyboard.delay(500);
  // Execute the following function in a command prompt
  DigiKeyboard.println("echo Pwned by Redacted Information Security");
  DigiKeyboard.delay(500);

  // Blink the red LED when the code has finished executing
  while (true)
  {
    digitalWrite(0, HIGH);
    digitalWrite(1, HIGH);
    delay(300);
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    delay(300);
  }
}

Upload and Test

• Click on 'Verify' (the tick icon) to ensure that the code will compile correctly.
• Click on 'Upload' (the arrow icon) and plug in the Digispark when invited to.
• Once the code has uploaded, you're done! Have fun playing with the code.