Crear Ejecutables y Modificar Variables en C#.NET

Primero necesitamos tener un ejecutable creado, en este caso para el ejemplo usare uno hecho en ASM y ensamblado con MASM32

Código

.386
.model flat,stdcall
option casemap:none
Ventana proto :DWORD,:DWORD,:DWORD,:DWORD
include \masm32\include\windows.inc
include \masm32\include\user32.inc
include \masm32\include\kernel32.inc
includelib \masm32\lib\user32.lib
includelib \masm32\lib\kernel32.lib
 
.data
ClassName db "cVentana",0
;Declaramos la variable a cambiar
Variable db "esperando",0
cTexto db "edit",0
 
.data?
hInstance HINSTANCE ?
CommandLine LPSTR ?
hwndEdit HWND ?
 
.const
IDedit equ 1
 
.code
start:
	invoke GetModuleHandle, NULL
        mov    hInstance,eax
	invoke GetCommandLine
	invoke Ventana, hInstance,NULL,CommandLine, SW_SHOWDEFAULT
	invoke ExitProcess,eax
Ventana proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD
	LOCAL wc:WNDCLASSEX
	LOCAL msg:MSG
	LOCAL hwnd:HWND
	mov   wc.cbSize,SIZEOF WNDCLASSEX
	mov   wc.style, CS_HREDRAW or CS_VREDRAW
	mov   wc.lpfnWndProc, OFFSET WndProc
	mov   wc.cbClsExtra,NULL
	mov   wc.cbWndExtra,NULL
	push  hInst
	pop   wc.hInstance
	mov   wc.hbrBackground,COLOR_BTNFACE+1
	mov   wc.lpszClassName,OFFSET ClassName
	invoke LoadIcon,NULL,IDI_QUESTION
	mov   wc.hIcon,eax
	mov   wc.hIconSm,eax
	invoke LoadCursor,NULL,IDC_HELP
	mov   wc.hCursor,eax
	invoke RegisterClassEx, addr wc
	INVOKE CreateWindowEx,WS_EX_CLIENTEDGE,ADDR ClassName,ADDR Variable,\
           WS_SYSMENU,600,\
           600,150,100,NULL,NULL,\
           hInst,NULL
	mov   hwnd,eax
	INVOKE ShowWindow, hwnd,SW_SHOWNORMAL
	INVOKE UpdateWindow, hwnd
	.WHILE TRUE
                INVOKE GetMessage, ADDR msg,NULL,0,0
                .BREAK .IF (!eax)
                INVOKE TranslateMessage, ADDR msg
                INVOKE DispatchMessage, ADDR msg
	.ENDW
	mov     eax,msg.wParam
	ret
Ventana endp
WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM
	.IF uMsg==WM_DESTROY
		invoke PostQuitMessage,NULL
	.ELSEIF uMsg==WM_CREATE
		invoke CreateWindowEx,WS_EX_CLIENTEDGE, ADDR cTexto,NULL,\
                        WS_CHILD or WS_VISIBLE or WS_BORDER or ES_LEFT or\
                        ES_AUTOHSCROLL,\
                        20,15,100,25,hWnd,IDedit,hInstance,NULL
		mov  hwndEdit,eax
		invoke SetWindowText,hwndEdit,ADDR Variable
		invoke SetFocus, hwndEdit
	.ELSE
		invoke DefWindowProc,hWnd,uMsg,wParam,lParam
		ret
	.ENDIF
	xor    eax,eax
	ret
WndProc endp
end start

"Variable" será sustituida en el programa hecho en c#.NET
Ahora necesitamos saber en que posición se encuentra la variable en el ejecutable para ello utilizamos un editor hexadecimal:

y vemos que está entre 2057 y 2065.

Realizamos el programa:

Código

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
 
namespace recursos
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void butExtraer_Click(object sender, EventArgs e)
        {
            try
            {
                SFguardar.Filter = "Archivo Ejecutables|*.exe";
                SFguardar.Title = "Guardar archivo ejecutable nuevo";
                SFguardar.ShowDialog();
                if (SFguardar.FileName != "")
                {
                    int contador = 0;
                    int iLetra = 0;
                    int iTexto = 0;
                    FileStream stream = new FileStream(SFguardar.FileName, FileMode.Create, FileAccess.Write);
                    BinaryWriter writer = new BinaryWriter(stream);
                    iTexto = txtVariable.Text.Length;
                    foreach (int i in Properties.Resources.prueba)
                    {
                        if (contador > 2056 && contador < 2066)
                        {
                            if (iLetra < iTexto)
                            {
                                writer.Write(Convert.ToByte(txtVariable.Text[iLetra]));
                                iLetra++;
                            }
                            else writer.Write(Convert.ToByte(0));
                        }
                        else writer.Write(Convert.ToByte(i));
                        contador++;
                    }
                    writer.Close();
                    stream.Close();
                }
            }
            catch (Exception er)
            {
                MessageBox.Show(er.Message);
            }
        }
 
        private void txtVariable_TextChanged(object sender, EventArgs e)
        {
            butExtraer.Enabled = true;
        }
        private void txtVariable_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (Convert.ToInt32(e.KeyChar) == 13) butExtraer_Click(null, null);
        }
 
    }
}

El código se encargará de leer uno a uno los elementos del array representado por el archivo de recursos que en este caso es el ejecutable mencionado, al llegar a la posición 2057 empezara a escribir el contenido del textbox en lugar de los datos originales y una vez que termina continua escribiendo el resto del contenido original, como resultado tenemos:

Así tb, si no utilizamos todos los caracteres que tiene la variable el programa los reemplazará con valores nulos así podremos reemplazar la variable total o parcialmente.

Tb puede hacerse de otro modo, si hacemos un programa que lea el contenido de un ejecutable y lo escriba en un *.txt, este lo utilizaremos para declarar un array y seguiremos los mismos pasos que utilizamos cuando era un archivo de recurso.

Este seria el resultado guardado en un *.txt de prueba.exe, el cual utilizaremos para declarar un array para escribir el ejecutable con la variable modificada.

Código:

77,90,144,0,3,0,0,0,4,0,0,0,255,255,0,0,184,0,0,0,0,0,0,0,64,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,184,0,0,0,14,31,186,14,0,180,9,205,33,184,1,76,205,33,84,104,105,115,32,112,114,111,103,114,97,109,32,99,97,110,110,111,116,32,98,101,32,114,117,110,32,105,110,32,68,79,83,32,109,111,100,101,46,13,13,10,36,0,0,0,0,0,0,0,56,25,93,41,124,120,51,122,124,120,51,122,124,120,51,122,242,103,32,122,105,120,51,122,128,88,33,122,125,120,51,122,82,105,99,104,124,120,51,122,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,80,69,0,0,76,1,3,0,156,54,147,75,0,0,0,0,0,0,0,0,224,0,15,1,11,1,5,12,0,2,0,0,0,4,0,0,0,0,0,0,0,16,0,0,0,16,0,0,0,32,0,0,0,0,64,0,0,16,0,0,0,2,0,0,4,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,64,0,0,0,4,0,0,0,0,0,0,2,0,0,0,0,0,16,0,0,16,0,0,0,0,16,0,0,16,0,0,0,0,0,0,16,0,0,0,0,0,0,0,0,0,0,0,72,32,0,0,60,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,32,0,0,72,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,46,116,101,120,116,0,0,0,234,1,0,0,0,16,0,0,0,2,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,32,0,0,96,46,114,100,97,116,97,0,0,240,1,0,0,0,32,0,0,0,2,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,64,0,0,64,46,100,97,116,97,0,0,0,36,0,0,0,0,48,0,0,0,2,0,0,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,64,0,0,192,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,106,0,232,221,1,0,0,163,24,48,64,0,232,205,1,0,0,106,10,255,53,28,48,64,0,106,0,255,53,24,48,64,0,232,6,0,0,0,80,232,172,1,0,0,85,139,236,131,196,176,199,69,208,48,0,0,0,199,69,212,3,0,0,0,199,69,216,9,17,64,0,199,69,220,0,0,0,0,199,69,224,0,0,0,0,255,117,8,143,69,228,199,69,240,16,0,0,0,199,69,248,0,48,64,0,104,2,127,0,0,106,0,232,51,1,0,0,137,69,232,137,69,252,104,139,127,0,0,106,0,232,27,1,0,0,137,69,236,141,69,208,80,232,33,1,0,0,106,0,255,117,8,106,0,106,0,106,100,104,150,0,0,0,104,88,2,0,0,104,88,2,0,0,104,0,0,8,0,104,9,48,64,0,104,0,48,64,0,104,0,2,0,0,232,196,0,0,0,137,69,176,106,1,255,117,176,232,243,0,0,0,255,117,176,232,247,0,0,0,106,0,106,0,106,0,141,69,180,80,232,178,0,0,0,11,192,116,20,141,69,180,80,232,213,0,0,0,141,69,180,80,232,150,0,0,0,235,217,139,69,188,201,194,16,0,85,139,236,131,125,12,2,117,9,106,0,232,149,0,0,0,235,104,131,125,12,1,117,77,106,0,255,53,24,48,64,0,106,1,255,117,8,106,25,106,100,106,15,106,20,104,128,0,128,80,106,0,104,19,48,64,0,104,0,2,0,0,232,62,0,0,0,163,32,48,64,0,104,9,48,64,0,255,53,32,48,64,0,232,95,0,0,0,255,53,32,48,64,0,232,78,0,0,0,235,21,255,117,20,255,117,16,255,117,12,255,117,8,232,17,0,0,0,201,194,16,0,51,192,201,194,16,0,204,255,37,64,32,64,0,255,37,56,32,64,0,255,37,52,32,64,0,255,37,32,32,64,0,255,37,16,32,64,0,255,37,20,32,64,0,255,37,24,32,64,0,255,37,28,32,64,0,255,37,60,32,64,0,255,37,36,32,64,0,255,37,40,32,64,0,255,37,44,32,64,0,255,37,48,32,64,0,255,37,4,32,64,0,255,37,0,32,64,0,255,37,8,32,64,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,188,33,0,0,174,33,0,0,206,33,0,0,0,0,0,0,18,33,0,0,32,33,0,0,44,33,0,0,62,33,0,0,4,33,0,0,94,33,0,0,112,33,0,0,126,33,0,0,146,33,0,0,240,32,0,0,222,32,0,0,82,33,0,0,204,32,0,0,0,0,0,0,148,32,0,0,0,0,0,0,0,0,0,0,162,33,0,0,16,32,0,0,132,32,0,0,0,0,0,0,0,0,0,0,226,33,0,0,0,32,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,188,33,0,0,174,33,0,0,206,33,0,0,0,0,0,0,18,33,0,0,32,33,0,0,44,33,0,0,62,33,0,0,4,33,0,0,94,33,0,0,112,33,0,0,126,33,0,0,146,33,0,0,240,32,0,0,222,32,0,0,82,33,0,0,204,32,0,0,0,0,0,0,86,0,67,114,101,97,116,101,87,105,110,100,111,119,69,120,65,0,131,0,68,101,102,87,105,110,100,111,119,80,114,111,99,65,0,0,147,0,68,105,115,112,97,116,99,104,77,101,115,115,97,103,101,65,0,0,34,1,71,101,116,77,101,115,115,97,103,101,65,0,148,1,76,111,97,100,67,117,114,115,111,114,65,0,152,1,76,111,97,100,73,99,111,110,65,0,213,1,80,111,115,116,81,117,105,116,77,101,115,115,97,103,101,0,225,1,82,101,103,105,115,116,101,114,67,108,97,115,115,69,120,65,0,0,22,2,83,101,116,70,111,99,117,115,0,0,61,2,83,101,116,87,105,110,100,111,119,84,101,120,116,65,0,0,72,2,83,104,111,119,87,105,110,100,111,119,0,0,94,2,84,114,97,110,115,108,97,116,101,77,101,115,115,97,103,101,0,0,106,2,85,112,100,97,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Resultado utilizado en el programa:

Código

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
 
namespace leerExe
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void butLeer_Click(object sender, EventArgs e)
        {
            FDabrirArchivo.Filter = "Archivo ejecutable|*.exe";
            FDabrirArchivo.Title = "Abrir archivo ejecutable";
 
            if (FDabrirArchivo.ShowDialog() == DialogResult.OK)
            {
                Array bArchivo = File.ReadAllBytes(FDabrirArchivo.FileName);
                SFguardarArchivo.Filter = "Archivo de Texto|*.txt";
                SFguardarArchivo.Title = "Guardar archivo de texto";
                SFguardarArchivo.ShowDialog();
                if (SFguardarArchivo.FileName != "")
                {
                    FileStream stream = new FileStream(SFguardarArchivo.FileName, FileMode.OpenOrCreate, FileAccess.Write);
                    StreamWriter writer = new StreamWriter(stream);
                    foreach (object b in bArchivo)
                    {
                        writer.Write(b + ",");
                    }
                    writer.Close();
                }
            }
        }
 
        private void butCrear_Click(object sender, EventArgs e)
        {
            int[] iArchivo = new int[2560] { 77, 90, 144, 0, 3, 0, 0, 0, 4, 0, 0, 0, 255, 255, 0, 0, 184, 0, 0, 0, 0, 0, 0, 0, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 184, 0, 0, 0, 14, 31, 186, 14, 0, 180, 9, 205, 33, 184, 1, 76, 205, 33, 84, 104, 105, 115, 32, 112, 114, 111, 103, 114, 97, 109, 32, 99, 97, 110, 110, 111, 116, 32, 98, 101, 32, 114, 117, 110, 32, 105, 110, 32, 68, 79, 83, 32, 109, 111, 100, 101, 46, 13, 13, 10, 36, 0, 0, 0, 0, 0, 0, 0, 56, 25, 93, 41, 124, 120, 51, 122, 124, 120, 51, 122, 124, 120, 51, 122, 242, 103, 32, 122, 105, 120, 51, 122, 128, 88, 33, 122, 125, 120, 51, 122, 82, 105, 99, 104, 124, 120, 51, 122, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 80, 69, 0, 0, 76, 1, 3, 0, 156, 54, 147, 75, 0, 0, 0, 0, 0, 0, 0, 0, 224, 0, 15, 1, 11, 1, 5, 12, 0, 2, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 16, 0, 0, 0, 32, 0, 0, 0, 0, 64, 0, 0, 16, 0, 0, 0, 2, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 64, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 16, 0, 0, 16, 0, 0, 0, 0, 16, 0, 0, 16, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 72, 32, 0, 0, 60, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0, 72, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 46, 116, 101, 120, 116, 0, 0, 0, 234, 1, 0, 0, 0, 16, 0, 0, 0, 2, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0, 96, 46, 114, 100, 97, 116, 97, 0, 0, 240, 1, 0, 0, 0, 32, 0, 0, 0, 2, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 0, 0, 64, 46, 100, 97, 116, 97, 0, 0, 0, 36, 0, 0, 0, 0, 48, 0, 0, 0, 2, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 0, 0, 192, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 106, 0, 232, 221, 1, 0, 0, 163, 24, 48, 64, 0, 232, 205, 1, 0, 0, 106, 10, 255, 53, 28, 48, 64, 0, 106, 0, 255, 53, 24, 48, 64, 0, 232, 6, 0, 0, 0, 80, 232, 172, 1, 0, 0, 85, 139, 236, 131, 196, 176, 199, 69, 208, 48, 0, 0, 0, 199, 69, 212, 3, 0, 0, 0, 199, 69, 216, 9, 17, 64, 0, 199, 69, 220, 0, 0, 0, 0, 199, 69, 224, 0, 0, 0, 0, 255, 117, 8, 143, 69, 228, 199, 69, 240, 16, 0, 0, 0, 199, 69, 248, 0, 48, 64, 0, 104, 2, 127, 0, 0, 106, 0, 232, 51, 1, 0, 0, 137, 69, 232, 137, 69, 252, 104, 139, 127, 0, 0, 106, 0, 232, 27, 1, 0, 0, 137, 69, 236, 141, 69, 208, 80, 232, 33, 1, 0, 0, 106, 0, 255, 117, 8, 106, 0, 106, 0, 106, 100, 104, 150, 0, 0, 0, 104, 88, 2, 0, 0, 104, 88, 2, 0, 0, 104, 0, 0, 8, 0, 104, 9, 48, 64, 0, 104, 0, 48, 64, 0, 104, 0, 2, 0, 0, 232, 196, 0, 0, 0, 137, 69, 176, 106, 1, 255, 117, 176, 232, 243, 0, 0, 0, 255, 117, 176, 232, 247, 0, 0, 0, 106, 0, 106, 0, 106, 0, 141, 69, 180, 80, 232, 178, 0, 0, 0, 11, 192, 116, 20, 141, 69, 180, 80, 232, 213, 0, 0, 0, 141, 69, 180, 80, 232, 150, 0, 0, 0, 235, 217, 139, 69, 188, 201, 194, 16, 0, 85, 139, 236, 131, 125, 12, 2, 117, 9, 106, 0, 232, 149, 0, 0, 0, 235, 104, 131, 125, 12, 1, 117, 77, 106, 0, 255, 53, 24, 48, 64, 0, 106, 1, 255, 117, 8, 106, 25, 106, 100, 106, 15, 106, 20, 104, 128, 0, 128, 80, 106, 0, 104, 19, 48, 64, 0, 104, 0, 2, 0, 0, 232, 62, 0, 0, 0, 163, 32, 48, 64, 0, 104, 9, 48, 64, 0, 255, 53, 32, 48, 64, 0, 232, 95, 0, 0, 0, 255, 53, 32, 48, 64, 0, 232, 78, 0, 0, 0, 235, 21, 255, 117, 20, 255, 117, 16, 255, 117, 12, 255, 117, 8, 232, 17, 0, 0, 0, 201, 194, 16, 0, 51, 192, 201, 194, 16, 0, 204, 255, 37, 64, 32, 64, 0, 255, 37, 56, 32, 64, 0, 255, 37, 52, 32, 64, 0, 255, 37, 32, 32, 64, 0, 255, 37, 16, 32, 64, 0, 255, 37, 20, 32, 64, 0, 255, 37, 24, 32, 64, 0, 255, 37, 28, 32, 64, 0, 255, 37, 60, 32, 64, 0, 255, 37, 36, 32, 64, 0, 255, 37, 40, 32, 64, 0, 255, 37, 44, 32, 64, 0, 255, 37, 48, 32, 64, 0, 255, 37, 4, 32, 64, 0, 255, 37, 0, 32, 64, 0, 255, 37, 8, 32, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 188, 33, 0, 0, 174, 33, 0, 0, 206, 33, 0, 0, 0, 0, 0, 0, 18, 33, 0, 0, 32, 33, 0, 0, 44, 33, 0, 0, 62, 33, 0, 0, 4, 33, 0, 0, 94, 33, 0, 0, 112, 33, 0, 0, 126, 33, 0, 0, 146, 33, 0, 0, 240, 32, 0, 0, 222, 32, 0, 0, 82, 33, 0, 0, 204, 32, 0, 0, 0, 0, 0, 0, 148, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 162, 33, 0, 0, 16, 32, 0, 0, 132, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 226, 33, 0, 0, 0, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 188, 33, 0, 0, 174, 33, 0, 0, 206, 33, 0, 0, 0, 0, 0, 0, 18, 33, 0, 0, 32, 33, 0, 0, 44, 33, 0, 0, 62, 33, 0, 0, 4, 33, 0, 0, 94, 33, 0, 0, 112, 33, 0, 0, 126, 33, 0, 0, 146, 33, 0, 0, 240, 32, 0, 0, 222, 32, 0, 0, 82, 33, 0, 0, 204, 32, 0, 0, 0, 0, 0, 0, 86, 0, 67, 114, 101, 97, 116, 101, 87, 105, 110, 100, 111, 119, 69, 120, 65, 0, 131, 0, 68, 101, 102, 87, 105, 110, 100, 111, 119, 80, 114, 111, 99, 65, 0, 0, 147, 0, 68, 105, 115, 112, 97, 116, 99, 104, 77, 101, 115, 115, 97, 103, 101, 65, 0, 0, 34, 1, 71, 101, 116, 77, 101, 115, 115, 97, 103, 101, 65, 0, 148, 1, 76, 111, 97, 100, 67, 117, 114, 115, 111, 114, 65, 0, 152, 1, 76, 111, 97, 100, 73, 99, 111, 110, 65, 0, 213, 1, 80, 111, 115, 116, 81, 117, 105, 116, 77, 101, 115, 115, 97, 103, 101, 0, 225, 1, 82, 101, 103, 105, 115, 116, 101, 114, 67, 108, 97, 115, 115, 69, 120, 65, 0, 0, 22, 2, 83, 101, 116, 70, 111, 99, 117, 115, 0, 0, 61, 2, 83, 101, 116, 87, 105, 110, 100, 111, 119, 84, 101, 120, 116, 65, 0, 0, 72, 2, 83, 104, 111, 119, 87, 105, 110, 100, 111, 119, 0, 0, 94, 2, 84, 114, 97, 110, 115, 108, 97, 116, 101, 77, 101, 115, 115, 97, 103, 101, 0, 0, 106, 2, 85, 112, 100, 97, 116, 101, 87, 105, 110, 100, 111, 119, 0, 0, 117, 115, 101, 114, 51, 50, 46, 100, 108, 108, 0, 0, 155, 0, 69, 120, 105, 116, 80, 114, 111, 99, 101, 115, 115, 0, 230, 0, 71, 101, 116, 67, 111, 109, 109, 97, 110, 100, 76, 105, 110, 101, 65, 0, 52, 1, 71, 101, 116, 77, 111, 100, 117, 108, 101, 72, 97, 110, 100, 108, 101, 65, 0, 0, 107, 101, 114, 110, 101, 108, 51, 50, 46, 100, 108, 108, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 99, 86, 101, 110, 116, 97, 110, 97, 0, 114, 101, 0, 0, 0, 0, 0, 0, 0, 0, 101, 100, 105, 116, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
            SFguardarArchivo.Filter = "Archivo Ejecutables|*.exe";
            SFguardarArchivo.Title = "Guardar archivo ejecutable nuevo";
            SFguardarArchivo.ShowDialog();
            if (SFguardarArchivo.FileName != "")
            {
                int contador = 0;
                int iLetra = 0;
                int iTexto = 0;
                FileStream stream = new FileStream(SFguardarArchivo.FileName, FileMode.Create, FileAccess.Write);
                BinaryWriter writer = new BinaryWriter(stream);
                iTexto = txtVariable.Text.Length;
                foreach (int i in iArchivo)
                {
                    if (contador > 2056 && contador < 2066)
                    {
                        if (iLetra < iTexto)
                        {
                            writer.Write(Convert.ToByte(txtVariable.Text[iLetra]));
                            iLetra++;
                        }
                        else writer.Write(Convert.ToByte(0));
                    }
                    else writer.Write(Convert.ToByte(i));
                    contador++;
                }
                writer.Close();
                stream.Close();
            }
        }
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (Convert.ToInt32(e.KeyChar) == 13) butCrear_Click(null, null);
        }
 
        private void txtVariable_TextChanged(object sender, EventArgs e)
        {
            butCrear.Enabled = true;
        }
    }
 
}

Descargar los proyectos:
http://www.4shared.com/file/236608224/327e0348/EscribirEXE.html

Si se me paso algo favor avisar, no lo revisé a fondo.