The short description of PCILeech: [1]

PCILeech is capable of inserting a wide range of kernel > implants into the targeted kernels - allowing for easy > access to live ram and the file system via a "mounted > drive". It is also possible to remove the logon password > requirement, loading unsigned drivers, executing code and > spawn system shells. PCIleech runs on Windows and Linux

[1] https://github.com/ufrisk/pcileech

(edit for formatting)