BadUSB

BadUSB refers to a class of USB devices that have been maliciously reprogrammed or manufactured to perform harmful actions when plugged into a computer. Unlike traditional malware that infects software, BadUSB attacks exploit the firmware of the USB device itself, allowing it to masquerade as a different type of device. For example, a BadUSB drive could present itself as a keyboard and inject malicious keystrokes, or as a network adapter to redirect internet traffic.

The primary danger of BadUSB lies in its ability to bypass many security measures. Because the malicious activity originates from the device's firmware, it can be difficult to detect with antivirus software. Once connected, the device can execute its payload without requiring user interaction or explicit permission, making it a potent threat.

There are several ways BadUSB attacks can be carried out. One method involves exploiting vulnerabilities in the USB controller firmware, allowing an attacker to rewrite it with malicious code. Another approach is to create entirely new USB devices designed with malicious intent from the outset, often mimicking legitimate devices like flash drives, charging cables, or even keyboards.

Preventing BadUSB attacks involves a combination of technical and procedural safeguards. Implementing USB port restrictions, using endpoint security solutions that can detect anomalous device behavior, and educating users about the risks of using unknown USB devices are crucial steps. Physical security of devices and limiting the types of USB devices allowed on a network can also mitigate the threat.