Convert Exe To Shellcode (2025)

Converting a standard .exe file into shellcode is not as simple as renaming the file or copying its bytes. A typical executable relies on the Operating System (OS) loader to handle complex tasks like memory allocation, resolving imports (DLLs), and base relocations. For an .exe to run as "shellcode," it must be converted into Position-Independent Code (PIC) that can execute from any memory address without these external OS dependencies. Common Tools for Conversion

Several specialized tools can automate the wrapping of an .exe into a shellcode-ready format:

Donut: This is the industry-standard tool for converting VBScript, JScript, EXE, DLL, and .NET assemblies into position-independent shellcode for x86 and x64 systems.

Pe2shc: A popular tool that makes a PE (Portable Executable) file act as a shellcode. It prepends a small stub that handles the necessary loading and relocation tasks at runtime.

exec2shell: A utility used to extract the .text (executable code) section of a PE or ELF file and output it as a raw binary or C-style array.

msfvenom: Part of the Metasploit framework, it can generate various payloads and encode existing executables into shellcode formats. Manual Method: Extracting the .text Section

If you only need the raw machine instructions from the executable code section, you can use a Python script with the pefile library to extract the .text segment.

import pefile import sys # Load the EXE file pe = pefile.PE(sys.argv[1]) # Function to grab executable code from the .text section def grab_executable_code(): ops = "" for section in pe.sections: # Looking for the primary executable section if b'.text' in section.Name: for item in bytearray(section.get_data()): # Format bytes as \x00 for shellcode strings ops += f"\\xitem:02x" return ops print(grab_executable_code()) Use code with caution. Copied to clipboard Key Technical Challenges

Embedding Shellcode in .text and .data section. | by Irfan Farooq

Converting a standard Windows executable (.exe) directly into shellcode is not as simple as copying its raw bytes. Standard executables rely on the Windows OS loader to handle complex tasks like resolving imports (DLLs), performing relocations, and setting up memory sections. Shellcode, by definition, must be position-independent code (PIC)—meaning it can run anywhere in memory without these external setup steps. Here is how you can effectively bridge that gap. Method 1: Use a PE-to-Shellcode Converter (Recommended)

The most reliable way to convert an existing EXE is to use a "loader-in-shellcode" tool. These tools prepend a small, specialized loader (a "stub") to your executable that mimics the Windows OS loader's behavior at runtime.

Donut: One of the most popular tools for this purpose. It creates position-independent shellcode from VBScript, JScript, and standard PE files (EXE/DLL). It is highly flexible and supports both x86 and x64 architectures. convert exe to shellcode

pe_to_shellcode: A tool by hasherezade that converts a PE file into a format that can be injected and run as shellcode while remaining a valid PE file.

InflativeLoading: A newer tool that dynamically converts unmanaged EXE/DLL files into PIC shellcode by prepending a shellcode stub to a dumped PE main module. Method 2: Manual Conversion via Assembly/C

If you are developing your own small tool and want it to be shellcode from the start, you can write it in a way that generates raw machine instructions directly.

Write Position-Independent Code: Avoid global variables and hardcoded memory addresses. Use the Instruction Pointer (RIP/EIP) for relative addressing.

Resolve APIs Dynamically: You cannot rely on an Import Address Table. Your code must manually find the base address of kernel32.dll (usually via the Process Environment Block or PEB) and then find the address of functions like GetProcAddress and LoadLibraryA.

Extract the Machine Code: After compiling your code (often into an Object file), use a tool like objdump or a hex editor to extract the raw bytes from the .text (code) section. Critical Technical Challenges

Imports & Dependencies: If your .exe depends on many third-party DLLs, the shellcode stub must be robust enough to find and load all of them in the target process.

Managed Code (.NET): Converting .NET executables (like Nanocore) is significantly harder because they require the Common Language Runtime (CLR) to be loaded first. Tools like Donut handle this by including a CLR header to bootstrap the environment.

Architecture Mismatch: You cannot run 64-bit shellcode in a 32-bit process (and vice versa) without complex "Heaven's Gate" techniques. Quick Comparison of Tools Donut General purpose, .NET, JS/VBS pe_to_shellcode Keeping the file valid while making it injectable InflativeLoading Unmanaged EXE/DLL with dynamic conversion

how can i created a shellcode.bin from .exe file #7 - GitHub

Converting an executable (EXE) into shellcode is a critical skill in offensive security, red teaming, and exploit development. While a standard EXE file relies on the operating system’s loader to manage memory and resolve dependencies, shellcode must be position-independent, meaning it can execute from any memory address without such assistance. Converting a standard

This guide explores the methods, tools, and technical challenges of transforming a standalone executable into functional shellcode. Understanding the Difference: EXE vs. Shellcode

To convert an EXE effectively, you must understand why a simple copy-paste of bytes won't work:

The OS Loader: A standard EXE (Portable Executable or PE) contains headers that tell Windows where to load code sections and how to find external functions in DLLs.

Dependency Resolution: EXE files use an Import Address Table (IAT) to link to system functions like CreateProcess. Shellcode, however, must manually locate these functions in memory by traversing structures like the Process Environment Block (PEB).

Position Independence: Standard binaries often use absolute memory addresses. Shellcode must use relative addressing to ensure it runs correctly regardless of where it is injected. Popular Tools for Conversion

Several automated tools simplify this complex process by prepending a "loader stub" to your EXE that handles the necessary memory mapping at runtime.

Converting a Windows executable (.exe) into shellcode involves transforming a standard Portable Executable (PE) Position-Independent Code (PIC)

that can run in memory without being loaded by the standard OS loader Popular Tools for Conversion

Several automated tools can wrap an existing EXE or DLL into a shellcode loader:

: A widely used generator that creates PIC from .NET assemblies, EXE files, and DLLs. It wraps the payload in a loader that handles memory decryption and execution. donut -f payload.exe -o payload.bin PE to Shellcode (pe2shc)

: Specifically designed to make a PE file runnable as shellcode by adding a specialized stub to the front. pe2shc.exe input.exe output.shc Step 1: Obtain the EXE File For this

: A multi-language tool (Python and Rust versions available) that converts EXEs to shellcode arrays for use in loaders. Manual Extraction Methods

If you are developing your own code specifically to be used as shellcode, you can extract it manually: hasherezade/pe_to_shellcode: Converts PE into a shellcode

Clone. Use recursive clone to get the repo together with all the submodules: git clone --recursive https://github.com/hasherezade/

mrd0x/pe2shc-to-cdb: Convert shellcode generated ... - GitHub

Step 1: Obtain the EXE File

For this example, let's assume you have a simple EXE file called example.exe. You can create one using a basic C program:

#include <stdio.h>
int main() 
    printf("Hello, World!\n");
    return 0;

Compile it using:

gcc -o example.exe example.c

Why Do This?

Why go through the trouble of converting an EXE to shellcode instead of just dropping the EXE on disk?

  1. Fileless Execution: Shellcode can be executed purely in memory. It never touches the disk. This bypasses file-system scanning controls and leaves fewer forensic artifacts.
  2. Loader Versatility: Shellcode can be injected into any process via standard injection techniques (CreateRemoteThread, QueueUserAPC, etc.) without needing to call CreateProcess on a file path.
  3. Obfuscation: Raw shellcode is easier to encrypt, encode (XOR/Base64), and hide within macros, scripts, or legitimate documents than a full binary file.

Important Considerations

4. Thread Context & Exit

Your shellcode must exit cleanly. If your EXE calls ExitProcess, it will terminate the entire host process (e.g., notepad.exe). Use /SUBSYSTEM:WINDOWS and ensure the EXE only returns. Donut's -x 1 uses ExitThread, which is safer for injection.

High-Level Approaches

There are two primary methods to achieve this conversion:

  1. Donut (Position-Independent Shellcode Generator) – The modern, robust approach.
  2. Manual PE to Shellcode Shimming – A raw, manual method using a custom loader stub.

We will focus on the dominant tool: Donut, then explore the manual method for educational purposes.

1. Resolve APIs Dynamically

The shellcode cannot rely on an import table. It must find the addresses of the functions it needs (like LoadLibraryA and GetProcAddress) on its own.

Limitations & Gotchas

Converting an EXE to shellcode is not magic. You will encounter issues:

  1. Size: A 10 MB EXE becomes a 10 MB shellcode blob. That's often too large for many injection targets.
  2. Dependencies: If your EXE relies on specific DLL versions or COM objects that aren't available in the target process, it will fail.
  3. Console vs GUI: A console app (/SUBSYSTEM:CONSOLE) may behave weirdly when injected into a GUI process.
  4. Anti-Virus: Shellcode generated this way is often signatured because Donut is widely known. Defenders easily detect the reflective loader stub.

4. Resolving Imports

Just like the OS loader, the shellcode must resolve the IAT.