USB Rubber Ducky

While the USB Rubber Ducky is well known by hackers as a tool for quick in-person keystroke injection attacks, one of the original uses for it was automation. In this guide, I'll be going the latter, explaining how we can use it to automate Wi-Fi handshake harvesting on the Raspberry Pi without using a screen or any other input.

Developed by Open Whisper Systems, Signal is a free, open-source encrypted communications app for both mobile and desktop devices that allows users to make voice calls, send instant messages, and even make video calls securely. However, a vulnerability was recently discovered for the desktop version that can be turned into a USB Rubber Ducky payload to steal signal messages with a single click.

If you need a tiny, flexible attack platform for raining down human-interface-device (HID) attacks on unattended computers, the USB Rubber Ducky is the most popular tool for the job. By loading the Ducky with custom firmware, you can design new attacks to be effective against even air-gapped computers without internet access. Today, you'll learn to write a payload to make "involuntary backups" through copying a targeted folder to the Ducky's USB mass storage.

The USB Rubber Ducky comes with two software components, the payload script to be deployed and the firmware which controls how the Ducky behaves and what kind of device it pretends to be. This firmware can be reflashed to allow for custom Ducky behaviors, such as mounting USB mass storage to copy files from any system the Duck is plugged into.