A malware that I made using C++, with SDL2 and Windows.h
This malware will make Windows unbootable, I suggest not running it on your computer, but instead on a virtual machine.
While it is running, it will not allow Command Prompt or Task Manager from running (results in a bluescreen and MBR overwrite), it will create disorienting effects, overwrite the MBR (make Windows no longer bootable), and create lots of text files.
Safe Mode will not overwrite the MBR, that's pretty much it.