Set to Minimize Size ( /O1 ) or Maximize Speed ( /O2 ).
Donut's architecture includes individual loaders for each supported file type. For .NET assemblies, it leverages the Unmanaged CLR Hosting API to load the Common Language Runtime (CLR) into the host process, create an Application Domain, and invoke the assembly's entry point. For native EXE files, Donut patches the command line and exit-related APIs to prevent termination of the host process.
that covers the compilation flags and code adjustments needed to prevent the compiler from adding dependencies. specific code requirements
If the file executes identically to the original PE, the conversion succeeded. The converted file can now be injected into any process and executed from the start of the buffer.
If you already have a compiled EXE file and do not have access to the source code, you can use specialized tools designed to wrap the PE file into a shellcode format. These tools append a custom PE loader stub to the front of your executable. convert exe to shellcode
# Align to page boundary subprocess.run(["msvc", "-c", "example.bin.noheader", "-Fo", "example.bin.aligned"])
It allocates a virtual address space for the process.
While converting an EXE to shellcode provides massive flexibility, developers must account for several technical limitations:
There are two primary approaches to converting an EXE into shellcode: using automated PE-to-Shellcode conversion frameworks, or writing position-independent code from scratch. Set to Minimize Size ( /O1 ) or Maximize Speed ( /O2 )
Professional ethics and legal compliance are fundamental when researching these techniques. Understanding the mechanics of executable-to-shellcode conversion is vital for defenders to develop more robust detection signatures and for researchers to improve memory-forensics tools.
Use a disassembler like `nasm` or `objdump` to verify the generated shellcode:
python clematis_gui.py
# On Kali Linux sudo apt install donut
The stub supports relocations, imports, and TLS callbacks. However, not every PE can be successfully converted—exceptions, delay-load imports, and MUI-dependent files may cause failures.
: Specifically designed to alter a PE file by adding a stub that allows it to be run as shellcode.
At its heart, converting an executable to shellcode is the process of taking a Portable Executable (PE) file—such as a .exe —and repackaging it into a that can be loaded and run directly from a process's memory. This is fundamentally different from how an operating system normally runs a program, which involves the OS loader reading the file from disk, setting up its environment, and executing it.
Maps the different sections ( .text for code, .data for initialized variables, .rsrc for resources) to memory addresses. The Dependency Problem For native EXE files, Donut patches the command
It identifies the external Dynamic Link Libraries (DLLs) the EXE needs (like kernel32.dll or user32.dll ) and resolves the function pointers (like VirtualAlloc or MessageBox ).
To successfully turn executable logic into shellcode, the compiled code must adhere to strict constraints: