USB killer

    It was an ordinary gloomy winter morning, my colleagues and I, as usual, drank morning coffee, shared news, and nothing signaled trouble. But then a friend told me ... more quote from skype chat:

    I once read an article as a guy in the subway pulled a flash bag from 128 in the subway net from the mesh pocket, on which 128 was written. He came home, put it in a laptop -> he burned the floor of the computer ... He wrote on a flash drive 129 and now wears his bag in the outer pocket ...

    A picture to attract attention:

    Since I work in an enterprise that develops and manufactures electronics, my colleagues and I began to actively discuss options for implementing such a flash drive, which “would burn a half-computer.” There were a lot of hardcore, fantastic, and also very real options . And everything would have ended with this fun discussion, if I had not intended to order the manufacture of printed circuit boards for my other projects.

    So, the USB interface of a computer, as a rule, includes a USB connector -> ESD diodes (protection against static) -> filter elements -> security elements in the chip itself, containing the physical layer of the USB interface. In modern USB computers, “physics” is almost integrated into the processor itself; in computers a bit older, north-south bridges are responsible for USB. The task of the developed flash drive is to burn the whole thing , burn the USB port at least.

    Within a week, I developed a very specific circuitry implementation, ordered components, and after several months of waiting for the components, a fully functional prototype was assembled. The idea itself was tested and everything that was possible was “burned”.

    Further, printed circuit boards in China were developed and ordered, a combat prototype was mounted.
    Sailboats ordered here . I’m terribly not satisfied with the quality - copper seems to be nothing, but the mask falls off, silk-screen printing is generally horrible. Consider anti-advertising.

    Hand-soldered by me, the installer of me is so-so.

    It was made under the body of a conventional flash drive.

    The principle of operation of the flash drive itself is quite simple. When connected to the USB port, the inverting DC / DC converter starts up and charges the capacitors to a voltage of -110V, when this voltage is reached, the DC / DC is turned off and the field effect transistor is opened through which -110V is applied to the signal lines of the USB interface. Further on fallingincreasing the voltage across the capacitors to -7V, the transistor closes and starts DC / DC. And so in a cycle until everything breaks through. The inquiring mind of a reader familiar with electronics has already figured out why a negative voltage is used, for others I will explain that it is easier to switch negative voltage, since an N-channel field effect transistor is needed, which, unlike a P-channel, can have a much larger current with the same dimensions.

    I will not speak about the scope, but a former colleague says that it’s like an atomic bomb, it’s cool to have it, but you can’t use it.

    In connection with the appearance on the Internet of many copies of my article, as well as translations into other languages, allegedly with my authorship, I inform readers that I published the article only on the website and nowhere else.
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    Arriving at work in the morning, you found a USB drive on your desk, your actions?

    • 81.6% I will insert it into the USB port in order to get acquainted with the contents. 7383
    • 18.3% Throw in the trash. 1660

    Some demand for the device, prompted to count potential buyers

    • 62.8% I would buy. 5600
    • 37.1% No thanks. 3310

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