This technique has been deprecated and should no longer be used.

A type-1 hypervisor is a software layer that sits between the guest operating systems and system's hardware.^[1] It presents a virtual running environment to an operating system. An example of a common hypervisor is Xen.^[2] A type-1 hypervisor operates at a level below the operating system and could be designed with Rootkit functionality to hide its existence from the guest operating system.^[3] A malicious hypervisor of this nature could be used to persist on systems through interruption.

References

1. Wikipedia. (2016, May 23). Hypervisor. Retrieved June 11, 2016.
2. Xen. (n.d.). In Wikipedia. Retrieved November 13, 2014.
3. Myers, M., and Youndt, S. (2007). An Introduction to Hardware-Assisted Virtual Machine (HVM) Rootkits. Retrieved November 13, 2014.

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