Bootkit
A bootkit is a collection of software tools or bootloaders installed on the compromised system after breaking into a computer system to disable other security mechanisms of the operating system.
A bootkit is thus a mixture of boot sector viruses and rootkits. The approach says that the person who has the hardware already under his control, can also have the software under its control. An effective hedge against the execution of unsigned code will probably be achieved only with the use of TPM hardware.
In the past there were bootkit attacks, for example, for the Vista operating system and the Cisco NAC solution.
The company Kaspersky Lab called bootkit as the challenge of the year 2008 in the malware.