The utility works by exploiting low-level vulnerabilities in MediaTek hardware initialization routines. Rather than installing permanent modifications to a PC, the "Portable" version executes directly from a single directory without writing persistent configuration keys to the Windows Registry.

At the absolute center of this utility is the libusb-win32 driver framework. Standard Windows USB drivers cannot properly handle the rapid, raw handshake commands required to interrupt a MediaTek chip's Bootrom sequence. The libusb0.dll engine intercepts the USB traffic to the device's hardware ID, forcing the connected device to accept an unsigned payload and output a execution code. Key Features of Version 6 (V6)

If you are a system administrator concerned about this attack vector, here is how to block authbypasstoolv6libusb portable .