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Windows User Space Emulator
A high-performance Windows process emulator that operates at syscall level, providing full control over process execution through comprehensive hooking capabilities.
Perfect for security research, malware analysis, and DRM research where fine-grained control over process execution is required.
Built in C++ and powered by the Unicorn Engine.
Key Features
- 🔄 Syscall-Level Emulation
- Instead of reimplementing Windows APIs, the emulator operates at the syscall level, allowing it to leverage existing system DLLs
- 📝 Advanced Memory Management
- Supports Windows-specific memory types including reserved, committed, built on top of Unicorn's memory management
- 📦 Complete PE Loading
- Handles executable and DLL loading with proper memory mapping, relocations, and TLS
- ⚡ Exception Handling
- Implements Windows structured exception handling (SEH) with proper exception dispatcher and unwinding support
- 🧵 Threading Support
- Provides a scheduled (round-robin) threading model
- 💾 State Management
- Supports both full state serialization and
fast in-memory snapshots(currently broken 😕)
- Supports both full state serialization and
- 💻 Debugging Interface
- Implements GDB serial protocol for integration with common debugging tools (IDA Pro, GDB, LLDB, VS Code, ...)
Note
The project is still in a very early, prototypy state. The code still needs a lot of cleanup and many features and syscalls need to be implemented. However, constant progress is being made :)
Preview
YouTube Overview
Click here for the slides.
Build Instructions
Prerequisites
- Windows 64-bit (click here for cross-platform status)
- CMake
- Git
Getting Started
Clone the repository with submodules:
git clone https://github.com/momo5502/emulator.git
cd emulator
git submodule update --init --recursive
Run the following commands in an x64 Development Command Prompt
Visual Studio 2022
cmake --preset=vs2022
Solution will be generated at build/vs2022/emulator.sln
Ninja
Debug build:
cmake --workflow --preset=debug
Release build:
cmake --workflow --preset=release
Dumping the Registry
The emulator needs a registry dump to run, otherwise it will print Bad hive file errors.
You can create one by running the src/tools/grab-registry.bat script as administrator.
This will create a registry folder that needs to be placed in the working directory of the emulator.
Running Tests
The project uses CTest for testing. Choose your preferred method:
Visual Studio:
- Build the
RUN_TESTStarget
Ninja:
cd build/release # or build/debug
ctest