![]() ![]() conf.win32-vcpp and delete below three lines (as they failed to link when I tested).Ĥ. Download source code from SVN and extract it.ģ. At least, gcc and zip commands are required.Ģ. This section explains how to compile and run Bochs with Visual Studio.ġ. By using Bochs, you are able to trace exactly why it happened with Boch s' emulation source code.įollowing sections describe steps to run a hypervisor in Bochs with the Visual Studio Debugger. For example, VMware provides no capabilities to trace why a VMX instruction failed or why a guest suddenly received a triple fault VM-exit. Open a corresponding VMX file and add the following lines.Īlthough VMware works perfect for development majority of times, it can be difficult to chase some bugs through only a kernel debugger. Check 'Virtualize Intel VT-x/EPT or AMD-V/RVI'Ģ. In order for running a hypervisor in a VM, you need to change configurations of the VM as fo llowings. VMware Workstation supports nested hardware virtualization and allows your hypervisor to run inside a VM. This chapter explains basic technical know-how of developing and debugging hypervisors. ◦A user-mode program kno ck ing at HyperPlatform's “backdoor”.Įnjoy the ring -1 programming! 4. ◦A user-mode program parsing logs created by HyperPlatform. It is implemented on the top of HyperPlatform. ◦A hypervisor-based tool monitoring some of PatchGuard activities. ◦A hypervisor-based tool detecting execution of kernel memory where is not backed by any image files using extended page table (EPT). Any assembler code => 圆4.asm, x86.asm and asm.hĪlso, there are some side projects useful to developers.V M-exit handlers => VmmpHandleVmExit() in vmm.cpp.An address of a sysenter handler => VmpSetupVmcs() in vm.cpp.Configurations of when VM -exit occurs => VmpSetupV mcs () in vm.cpp.DriverEntry and an unload handler => driver.cpp.The rests are left to your ideas, but followings is a list of locations where you may want to take a look at and modify for your own purposes: Build the project for 'x86' or '圆4' (HyperPlatform does not support ARM architecture). In this document, a project is named ' EopMon '.ĩ. Create a new project for 'Kernel Mode Driver, Empty (KMDF)'. Windows Driver Kit (WDK) 10 (6.0 or later)ġ.Windows Software Development Kit (SDK) for Windows 10 (6.0 or later).You need the following packages to compile HyperPlatform: This chapter describes steps to create a new Visual Studio project derived from HyperPlatform and briefly explains where to modify to implement your own logic on the top of HyperPlatform. This document is available in m ultiple formats:į or more high level information on HyperPlatform, s ee the project page. This document describes how to use HyperPlatform to develop your own hypervisor- based tools and general knowledge on hypervisor development. Taking a memory dump from a VMware Virtual Machine Gotcha: Incompatibility with the Driver Verifierģ.5.7. Gotcha: Use a guest CR3 value for memory accessģ.4.5. Gotcha: Use breakpoints moderately in a VM-exit handlerģ.4.4. Gotcha: Do not step-in to VMLAUNCH and VMRESUMEģ.4.3. Gotcha: Avoid using API inside a VM-exit handlerģ.4.2. Debugging code through the Visual Studio Debuggerģ.4.1. This article is focused on the 'PE mode", so let's take a look about how it works.3.3.3. How this emulation works and how we can play with it is the main topic of this article. ![]() PE: Quite similar to the IDB mode but where IDA provides a basic environment with a PE loader, and support for the emulation of some win32 API calls. IDB: its intended use is only to select a piece of assembly code and debug it "virtually" using Bochs. It's probably the best way but it requires having a working virtual machine so for those who never tried, it's a slightly painful process. Disk image: You can use an image or "bochs virtual machine" to debug your target. This new plugin allows three different ways to debug the targets: Just to put some context, in the current version of IDA Pro (right now is 5.5 as I wrote this), Hex-Rays included a new debugger plugin so it is possible to debug targets using Bochs x86 emulator. ![]() Bochs is one of the common environments where it is being used to run/analyze malware, we found interesting to show what you can do, what you can't and what really needs to be improved in this new debugging mode. Lately, this had often happened while talking about using IDA and Bochs together, specially using the debugger in the special "PE mode". Sometimes, you find out how to use the tool in an unexpected way, others is just an unknown shortcut or undocumented behaviour. It is common, when one reverser keeps talking to another, to find out new ways to use tools we already have. ![]()
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