Hardware hacker Samy Kamkar has released a tool called PoisonTap that is capable of a plethora of malicious actions. PoisonTap is a small device built on top of a Raspberry Pi Zero $5 board, which runs custom software and a Node.js server. It works by spoofing an over-USB Ethernet adapter, which sets up as the primary source of Internet traffic for all IPv4 addresses. The device is also able to make requests to the user’s local router, allowing the attacker to sniff the local network’s unencrypted traffic.
Source: https://www.bleepingcomputer.com/news/security/poisontap-can-hijack-web-traffic-and-install-backdoors-on-password-protected-pcs/