Keystroke Injection Attack demo w/ STM32F401 (Black Pill)

Build Guide

1. edit the Makefile
2. build libopencm3

   make -C libopencm3 # (Only needed once)

3. build the project

   make

Usage guide

• build
• flash the firwmare
• hold the builtin button while ressetting to enter programming mode
• flash the script

   dd if=script.txt of=/dev/sdx bs=4k conv=sync

• press the built-in button to test the attack
• if good, then press the button for ~2 seconds, to burn it into flash, (led should blink twice)
• next reset, the script will run automaticaly (unless prevented by entering programming mode)

Dev Board info

This project was built using the stm32f401rc based black pill board, featuring a builtin usb connector (with pa9, aka vsense not connected to it) and an hse crystal of 25MHz

Resources

• "USB in a NutShell"
• "libopencm3 examples"
• "Ben Eater USB Videos"
• "Usb.org"
• "stm32_HID_keyboard repo"
• adafruit duckyscript parser