Day 5: The VM-exit Handler, Event Injection, Context Modifications, and CPUID Emulation
Overview In the last article you learned about the VMCS, initializing the VMCS, segmentation and made a skeleton of the VM-exit handler. It was a long read, but if you’re here reading this now you’ve made it through the most time consuming part. Now we get to start interposing on system operations at a whim, […]
Day 4: VMCS Initialization, Segmentation, and Operation Visualization
Overview A quick apology for the extended delay of this series. It is my intention to continue this series at Day 4 with a lot of newfound knowledge to share with the readers. I hope that with the last 6 months those of you who had taken an interest in this series were able to […]
Syscall Hooking via Extended Feature Enable Register (EFER)
Since the dawn of KVA Shadowing (KVAS), similar to Linux’s KPTI, which was developed by Microsoft to mitigate Meltdown vulnerabilities, hooking syscalls among other potentially malicious things has become increasingly difficult in Windows. Upon updating my virtualization toolset which utilizes syscall hooking strategies to assist in control flow analysis, I had trouble when trying to […]
Day 3: The VMCS, Component Encoding, and Multiprocessor Initialization
Overview This article will be presenting a lot of different information. The first section will be over multiple-processor initialization, the different processor classes and how they’re referenced throughout the post, and a variety of other multi-processor related information. I’ll also demonstrate the MP initialization protocol for the hypervisor we’re creating in full detail using what […]
Day 2: Entering VMX Operation, Explaining Implementation Requirements
Overview Today is the day of heavy details and implementation. There will be a lot of technical explanation and a lot of text. We’ll start off with a section explaining the need for some form of internal logging API because – well, having DbgPrint spammed throughout functions when validating certain control values is disgusting and […]
Day 1: Introduction to Virtualization, Type Definitions, and Support Testing
Overview In this article we’re going to introduce virtualization, the various forms of virtualization, terminology, and a high level view of the abstraction that is virtualization. We’ll also be building out a test function for support of virtual machine instructions, followed by defining structures to represent various architectural registers and components. The reason for using […]
Day 0: Virtual Environment Setup, Scripts, and WinDbg
Overview Today is the day you begin your wild journey into hypervisor development. It’s going to be miserable, rewarding, frustrating, and exciting – all at the same time. In this article, we accelerate head on into setting up our virtual environment using VMware (taking advantage of their nested virtualization), write scripts for quick stand-up and […]
5 Days to Virtualization: A Series on Hypervisor Development
Overview Next week, (10/29) I’ll be starting to publish a series that is written to aid new and interested readers with building, testing, and understanding type-2 hypervisor development. This hypervisor will be written for use on Intel processors with virtualization support. If you’re operating on an AMD chip, you may find some parts helpful, but […]
Superseding Driver Altitude Checks on Windows
It was brought to my attention that in an article on my former research portfolio[2] I mentioned another way to manipulate an unsigned driver and perform some black magic. This black magic is done by modifying a flag in the _DRIVER_OBJECT allowing for the loaded driver to supersede altitude checks, register callbacks both with the […]
Detecting Hypervisor Presence on Windows 10
Detecting a hypervisor on Windows 10 is relatively simple, but due to the simplistic nature of the currently published detection vectors it’s likely that they are also relatively simple to spoof or remove. In this article we’ll detail a few ways of detecting a hypervisors presence on Windows 10, determining if it’s a Microsoft hypervisor, […]