Super Simple Auto-Running DLL

This is the DLL I used in the DLL injector.  I actually changed it instead of a message box to just write a file into the c:\misc directory.

1:  #include "stdafx.h"  
2:  #include <fstream>  
3:    
4:  BOOL APIENTRY DllMain( HMODULE hModule,  
5:              DWORD ul_reason_for_call,  
6:              LPVOID lpReserved  
7:             )  
8:  {  
9:       std::ofstream myfile;  
10:    switch (ul_reason_for_call)  
11:    {  
12:    case DLL_PROCESS_ATTACH:  
13:            myfile.open("c:\\misc\\dllInjectTest.txt");  
14:            myfile << "Bomb Diggity!\n";  
15:            myfile.close();  
16:            break;  
17:    case DLL_THREAD_ATTACH:  
18:            myfile.open("c:\\misc\\dllInjectTest.txt");  
19:            myfile << "Bomb Diggity!\n";  
20:            myfile.close();  
21:    case DLL_THREAD_DETACH:  
22:    case DLL_PROCESS_DETACH:  
23:      break;  
24:    }  
25:    return TRUE;  
26:  }  

The DllMain function is what's executed when the DLL is loaded by a process or thread, or detached by the same.