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// ________________________________________________
// 
// BreakingSecurity Shellcode Loader
// 
// PURPOSE:
// Useful tool to load and test shellcodes. Written in C.
// 
// TERMS OF USAGE:
// The software is provided for legitimate cybersecurity purposes, 
// including authorized penetration testing, red teaming, and educational purposes.
// The author is not responsible for any damage or illegal use of this software.
// 
// DESCRIPTION:
// The program will load the shellcode from file and execute it into its own process memory.
// 4 different shellcode loading methods are provided as option.
//
// USAGE:
// Execute the program passing the shellcode file path as parameter.
// 2° parameter is optional and lets you define the preferred shellcode loading method:
// 1 = C Function (Default)
// 2 = Inline ASM (Available for 32-bit only)
// 3 = CallWindowProc
// 4 = CreateThread
// 
//
// RELEASE NOTES:
// 
// v1.2.0 | 21 Feb 2026
// [+] Added new CreateThread method to execute shellcode. This method is available for both 32 and 64 bit architectures.
// [*] Added check when entering invalid method.
// 
// v1.1.0 | 20 Feb 2026
// [+] 64-bit support: Added 64 bit architecture to load 64 bit shellcodes
// [*] Other minor code improvements and refactoring.
// 
// v1.0.0 | 27 Jul 2021
// Initial release
// 
//
// AUTHOR:
// Viotto © BreakingSecurity.net 
// https://BreakingSecurity.net
// ________________________________________________


#include <Windows.h>
#include <stdio.h>

// Shellcode Entrypoint function prototype
// TIP: We can edit this function to support different return types and parameters
typedef INT(*ShellEntry)();

#define METHOD_CFUNCTION 1
#define METHOD_INLINEASM 2
#define METHOD_CALLWINDOWPROC 3
#define METHOD_CREATETHREAD 4


int main(int argc, char *argv[])
{
	int ret = 0;
	int err = 0;
	DWORD fsize = 0;
	int mtd = METHOD_CFUNCTION; // Default method is: C Function

	#ifndef _WIN64
	const char* szArch = "32 bit";
	#else
	const char* szArch = "64 bit";
	#endif

	printf(
	"\n"
	"-------------------------\n"
	" Shellcode Loader v1.2.0 \n"
	" BreakingSecurity.net    \n"
	"-------------------------\n"
	"\n"
	);

	printf("[i] Loader architecture: %s\n", szArch);

	if (argc < 2)
	{
		printf(
		"[-] ERROR: No parameter passed. Path to shellcode is required.\n"
		"\n"
		"-------------------------\n"
		"USAGE INSTRUCTIONS:\n"
		"ShellLoad32.exe path\n"
		"ShellLoad32.exe path method\n"
		"\n"
		"METHODS:\n"
		"1 = C Function (Default)\n"
		"2 = Inline ASM (Available for 32 bit only)\n"
		"3 = CallWindowProc\n"
		"4 = CreateThread\n"
		"\n"
		"EXAMPLES:\n"
		"Default method: ShellLoad32.exe \"C:\\shellcode.bin\"\n"
		"Select method: ShellLoad32.exe \"C:\\shellcode.bin\" 2\n"
		"-------------------------\n\n"
		"Press any key to exit\n"
		);

		_getch();
		return 0;
	}

	if (argc > 2)
	{
		mtd = atoi(argv[2]);
	}

	#ifdef _WIN64
	if (mtd == METHOD_INLINEASM)
	{
		printf("[-] Method: Inline ASM is unavailable in 64-bit. Please retry with different method.\n");
		return 0;
	}
	#endif

	printf("[+] Opening file: %s\n", argv[1]);

	HANDLE hFile = CreateFileA(argv[1], GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

	if (hFile == INVALID_HANDLE_VALUE) 
	{
		err = GetLastError();
		printf("[-] ERROR: Unable to open file. Error %i\n", err);
		return 0;
	}

	fsize = GetFileSize(hFile, NULL);

	if (fsize == INVALID_FILE_SIZE) 
	{
		err = GetLastError();
		printf("[-] ERROR: GetFileSize error %i\n", err);
		CloseHandle(hFile);
		return 0;
	}

	printf("[+] File Size: %i bytes\n", fsize);
	printf("[+] Allocating memory buffer...\n");

	void* pShellcode = VirtualAlloc(NULL, fsize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

	if (pShellcode == NULL) 
	{
		err = GetLastError();
		printf("[-] ERROR: VirtualAlloc error %i\n", err);
		CloseHandle(hFile);
		return 0;
	}

	printf("[+] Reading file...\n");

	DWORD nBytesRead = 0;
	ReadFile(hFile, pShellcode, fsize, &nBytesRead, NULL);
	CloseHandle(hFile);

	switch (mtd)
	{
		case METHOD_CFUNCTION:
		{
			printf("[+] Executing shellcode (method: C Function)\n");

			ShellEntry fShellcode = (ShellEntry)pShellcode;
			ret = fShellcode();
			break;
		}

		#ifndef _WIN64
		case METHOD_INLINEASM:
		{
			
			printf("[+] Executing shellcode (method: Inline ASM)\n");

			__asm
			{
				call pShellcode	// Execute shellcode entrypoint
				mov ret, eax	// Retrieve return value
			}

			break;
		}
		#endif
	
		case METHOD_CALLWINDOWPROC:
		{
			printf("[+] Executing shellcode (method: CallWindowProc)\n");

			// TIP: we can use CallWindowProc parameters to pass arguments to our function
			ret = CallWindowProcA((WNDPROC)pShellcode, 0, 0, 0, 0);
			break;
		}

		case METHOD_CREATETHREAD:
		{
			printf("[+] Executing shellcode (method: CreateThread)\n");

			ret = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)pShellcode, NULL, 0, NULL);
			break;
		}

		default:
		{
			printf("[-] ERROR: Invalid method selected. Please retry with valid method.\n");
			return 0;
		}
	}

	printf("[+] Shellcode executed!\n");
	printf("[+] Press any key to exit\n");
	_getch(); // Keep shellcode running
	return ret;
}