Convert Exe To Shellcode [SAFE]

Your stub must:

Disclaimer: This post is intended for educational purposes only, aimed at cybersecurity professionals, red teamers, and malware analysts. Converting legitimate software into shellcode can be used for defensive research, antivirus evasion testing, and understanding attack vectors. Do not use these techniques on systems you do not own or have explicit permission to test.

A standard Windows Portable Executable (.exe) is not position-independent. It expects to be loaded at a specific base address (e.g., 0x400000). It relies on the Windows loader to:

Shellcode, by contrast, must run anywhere. So we cannot just dump the raw bytes of an .exe and jump to them. That will crash instantly.

Writing this loader from scratch is tedious. Fortunately, the security community has developed tools to automate this process.

Converting an Executable (EXE) file into shellcode is a common technique used in red teaming and exploit development to execute programs in memory without dropping them on the disk. This process essentially wraps the PE (Portable Executable) file with a position-independent loader. Core Conversion Tools

The following tools are the industry standards for transforming compiled binaries into executable shellcode:

Donut: The most versatile tool for converting .NET Assemblies, EXE, and DLL files into position-independent shellcode.

Features: Supports x86 and x64, bypasses AMSI/WLDP, and offers compression (LZNT1, Xpress) to reduce payload size. Usage: donut.exe -f your_file.exe -o loader.bin. convert exe to shellcode

Available on GitHub - TheWover/donut and as a Kali Linux package.

PE to Shellcode (pe2shc): Specifically designed to alter a PE file by adding a stub that allows it to be run as shellcode.

Benefit: It doesn't just hex-encode the file; it makes the PE itself executable as PIC (Position-Independent Code). Available on GitHub - hasherezade/pe_to_shellcode.

sRDI (Shellcode Reflective DLL Injection): Primarily for converting DLLs into shellcode that can be reflectively loaded. Available on GitHub - monoxgas/sRDI. Comparison of Methods Target Type Primary Use Case Output Format Donut .NET, EXE, DLL, JS, VBS Evasive in-memory execution binary (.bin), C, Python, Base64 pe2shc Windows PE (EXE/DLL) Direct conversion of PE to PIC binary (.bin) sRDI Windows DLL Stealthy reflective loading binary shellcode Advanced & Niche Options donut-shellcode | Kali Linux Tools

Converting an executable (EXE) file into shellcode is a common requirement for security researchers and penetration testers. Shellcode is a payload of machine code that is executed by an exploit to perform a specific task, such as spawning a shell or establishing a reverse connection. Unlike standard executables, shellcode must be position-independent, meaning it can run regardless of where it is loaded in memory. Understanding the Conversion Process

A standard Windows EXE file relies on the Portable Executable (PE) format. This format includes headers, section tables, and import address tables (IAT) that tell the Windows Loader how to map the file into memory and resolve dependencies like kernel32.dll.

Shellcode does not have the luxury of a loader. When you convert an EXE to shellcode, you are essentially extracting the raw machine instructions and ensuring that any external functions the code needs are located manually at runtime, usually through techniques like parsing the Process Environment Block (PEB). Popular Methods to Convert EXE to Shellcode

There are several ways to approach this conversion, ranging from automated tools to manual extraction. 1. Using Donut Your stub must: Disclaimer: This post is intended

Donut is currently the industry standard for this task. It is a position-independent code generator that creates shellcode payloads from PE files, .NET assemblies, and even VBScript.

How it works: Donut wraps the EXE in a "loader" stub. When the shellcode executes, the stub decrypts the EXE, maps it into memory, and executes it.

Key Feature: It supports both x64 and x86 architectures and can bypass many AMSI/ETW security checks. 2. Using PE2SHC

PE2SHC (PE to Shellcode) is a tool designed specifically to make a PE file "self-running" as shellcode.

How it works: It adds a small bootstrap at the beginning of the EXE. When you jump to the start of the file, this bootstrap relocates the rest of the PE structure in memory.

Benefit: It is very lightweight and preserves the original structure of the EXE, making it useful for researchers analyzing malware behavior. 3. Manual Extraction via Hex Editor

For very simple, self-contained programs written in C or Assembly, you can extract the .text section directly.

Process: Compile your code with all optimizations off and no external dependencies. Use a tool like objcopy or a Hex Editor to copy the bytes from the executable's code section. Shellcode, by contrast, must run anywhere

Limitation: This only works if your code does not use any global variables or external DLL calls, as those addresses will be broken once moved. Key Challenges

Size Constraints: Shellcode is often injected into small memory buffers. Large EXEs may not fit.

Null Bytes: Many exploits fail if the shellcode contains null bytes (0x00), as they act as string terminators. You may need to encode your shellcode using tools like Shikata Ga Nai.

Architecture Mismatch: You must ensure the architecture (x86 vs x64) of your shellcode matches the target process you are injecting into. Step-by-Step Guide with Donut If you want the most reliable result, follow these steps: Prepare your EXE: Ensure it is a standalone executable.

Run Donut: Use the command line: donut.exe -i yourfile.exe -o payload.bin.

Test the Output: Use a simple C++ shellcode runner to load payload.bin into memory and execute it to verify functionality. If you'd like to dive deeper, let me know: Are you working with C++ or .NET? Do you need to bypass antivirus (AV) or EDR?

What is the target environment (Windows version, architecture)?

I can provide a specific code snippet for a shellcode runner or explain how to obfuscate the output.