A rubber ducky is a USB stick that acts like a Human Interface Device (HID), which means the keyboards and mice that connect to a computer via a USB port. The rubber ducky acts like an automated keyboard, sending keystroke instructions to the operating system, thus launching programs and entering data just as though a user sat at the computer typing. Anti-virus systems don’t even check on the activity of rubber duckies because for all any program can tell, this is a valid peripheral device that the user has added.