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. convert exe to shellcode
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. Converting a standard
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. A Windows EXE you want to convert (e
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
Even after conversion, your EXE must not contain hardcoded absolute addresses (e.g., mov rax, [0x408000]). Most modern compilers produce relocatable code (/DYNAMICBASE, /FIXED:NO), but static-linked executables without relocations cannot be converted reliably.
messagebox.exe).