To a human it’s a flash drive. To a computer it’s a keyboard, typing at superhuman speeds.
Keystroke Injection – Computers trust humans. Humans use keyboards. Hence the universal spec — HID, or Human Interface Device. A keyboard presents itself as a HID, and in turn it’s inherently trusted as human by the computer. The USB Rubber Ducky — which looks like an innocent flash drive to humans — abuses this trust to deliver powerful payloads, injecting keystrokes at superhuman speeds.