Any interaction of a USB device with a computer is carried out using a microcontroller and so that it can carry out actions, a control code is stored in its own service memory that the normal user does not have access to. Each USB device includes a controller chip that can be reprogrammed with a small physical and software impact. This is where the concept of “BadUSB vulnerability” arises. Since this threat works with software and hardware implementation of microcodes, the danger of the threat of BadUSB is high. Since all operating systems of the Windows, Linux, Macintosh family are subject to it, protection against this threat is complicated. And standard manipulations with the reinstallation of the operating system, which are a universal solution for most vulnerabilities, are not able to “cure” a computer infected with BadUSB media. In this paper, a description and analysis of the work of sketches when creating a device with a BadUSB vulnerability is given, and possible methods of protection are given.