Which type of malware uses USB firmware changes to directly interact with the operating system?

• A. Divergent
• B. USB-based malware
• C. Device-based malware
• D. Malware analysis

Answer: (B)

USB-based malware targets the USB hardware itself by changing the firmware on the USB controller. By rewriting that firmware, the device can present itself as a trusted USB device (often an HID like a keyboard or a mass storage device) and execute code or issue commands as soon as it’s connected. This lets the malware interact directly with the host operating system at a low level, bypassing many software-level defenses and enabling persistence, payload delivery, or keystroke injection without needing to exploit software on the host first. The other terms don’t specifically describe this hardware/firmware compromise: one is not a standard malware category, another is too vague about targeting and method, and the last refers to the activity of analyzing malware rather than a type of malware.