I'm not going to say 'no', but I would highly doubt it. If you're wondering what the 'state of the art' in disguising components to look like other components

I'm not going to say 'no', but I would highly doubt it. If you're wondering what the 'state of the art' in disguising components to look like other components is, this [1] is probably the best example. It's a guy that turned a LED into an LED and an inductor, and put transistors inside of switches. What you're proposing -- basically putting a USB-capable microcontroller inside something that looks like resistor -- isn't impossible. I can imagine that it could be done, but I would have no idea how. You would probably go with a very small (physically) microcontroller, maybe one of the SOT-23-6 PIC or AVR packages. I don't think it's possible to write a USB stack for those, and you only have 1-2kB to implement a BadUSB [2] sort of thing. It might be possible, but I doubt it. Still, that size of package could be disguised as a (large) SMD resistor, although the PCB would look odd with the addition of extra traces. To be honest, it really wouldn't make sense to disguise a microcontroller as passive components. It's already been demonstrated journalists will gladly plug random USB devices into their computer. If you wanted the device to just pass a cursory investigation, you'd just put a glob of black epoxy over the USB port. Hiding a microcontroller as a pair of resistors might be possible, but it's far more effort than what is really needed. [1] https://www.youtube.com/watch?&v=RkTvDjhImwo https://www.youtube.com/watch?&v=RkTvDjhImwo [2] https://opensource.srlabs.de/projects/badusb https://opensource.srlabs.de/projects/badusb