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People usually trigger programs already there on their PCs when they connect their uC. There are already things like uC that can inject keystrokes. I was thinking of something even more ambitious -

I write a program in C or Python that i want to run in the background and somehow(?) store it in the flash of the uC. As soon as the uC is plugged in, lets say it shows itself as a USB Keyboard or something similar and dumps the contents of the flash to the PC and runs that program in the background of the PC.

Is this possible? If yes, I would like to have some suggestions on how to go about accomplishing it.

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    Just out of curiosity, what would this program do? Send the user's bank details to your web site? – Nick Gammon Aug 8 '18 at 6:20
  • No, my original intentions were not that. I thought of this after going through the Square Inch challenge that opened yesterday on Hackaday and looked at my USB wireless mouse receiver. For the project i thought of just transmitting some dummy data and scoping if it is even possible. @NickGammon – jar Aug 8 '18 at 6:23
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    If you could, that would be a massive security flaw. I'm not saying it isn't possible, I just hope it isn't. Do you really, seriously, want to have something which looks like a USB fan or light be able to install a binary on your PC and then execute it? – Nick Gammon Aug 8 '18 at 7:48
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    Even if your own intentions are completely honest and above-board, any answer which describes how to do it could be exploited by a criminal as a recipe for how to install malware onto peoples' PCs. – Nick Gammon Aug 8 '18 at 7:51
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    The whole purpose of this exercise was to do this in a controlled environment. - I totally understand that. But someone reading this may try it in an uncontrolled environment. – Nick Gammon Aug 8 '18 at 10:01

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