[C/C++] .dll - Injector - CreateRemoteThread

#include <Windows.h>
#include <TlHelp32.h>
#include <stdio.h>

char DllPath[MAX_PATH] = {0};

DWORD FindProcessID(const char *process_name)
{
 PROCESSENTRY32 pe32;
 HANDLE snapshot=CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);

 if(snapshot==INVALID_HANDLE_VALUE)
 return 0;

 pe32.dwSize=sizeof(PROCESSENTRY32);
 BOOL ret=Process32First(snapshot,&pe32);

 while(ret)
 {
 if(!strcmp(pe32.szExeFile,process_name))
 return pe32.th32ProcessID;

 ret=Process32Next(snapshot,&pe32);
 pe32.dwSize=sizeof(PROCESSENTRY32);
 }

 return 0;
}

DWORD FindProcessID(const char *window_class, const char *window_name)
{
 DWORD pid=0;
 HWND hlhwnd = FindWindow(window_class,window_name);

 if(GetWindowThreadProcessId(hlhwnd,&pid))
 return pid;

 return 0;
}

BOOL FileExist(const char *FileName)
{
 WIN32_FIND_DATA FindFile;
 HANDLE handle=FindFirstFile(FileName,&FindFile);
 return(handle!=INVALID_HANDLE_VALUE);
}

void InjectDLL()
{
 DWORD ProcessID=0;
 
 do
 {
 ProcessID=FindProcessID("Notepad"); // PROZESSNAMEN HIER HIN
 }while(FAILED(ProcessID));

 HANDLE Proc=OpenProcess(PROCESS_ALL_ACCESS,FALSE,ProcessID);
 LPVOID LoadLibAddy=(LPVOID)GetProcAddress(GetModuleHandle("kernel32.dll"),"LoadLibraryA");
 LPVOID RemoteString=(LPVOID)VirtualAllocEx(Proc, NULL, strlen(DllPath),MEM_RESERVE|MEM_COMMIT,PAGE_READWRITE);
 WriteProcessMemory(Proc,(LPVOID)RemoteString,DllPath,strlen(DllPath),NULL);
 CreateRemoteThread(Proc,NULL,NULL,(LPTHREAD_START_ROUTINE)LoadLibAddy,(LPVOID)RemoteString,NULL,NULL);
 CloseHandle(Proc);
}

int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPInst,LPSTR lpCmdLine,int nCmdShow)
{
 HANDLE hMutex = CreateMutex(NULL,NULL,"injector_m");

 if(GetLastError()==ERROR_ALREADY_EXISTS)
 {
 MessageBox(0,"Loader is already running!","Warning",MB_ICONWARNING|MB_OK);
 ExitProcess(0);
 }

 GetModuleFileName(0, DllPath, MAX_PATH); // Name des aktuellen Programmes nehmen und als DLL-Namen verwenden
 DllPath[strlen(DllPath)-3]=0;
 strcat_s(DllPath,"dll");

 if(!FileExist(DllPath))
 {
 char buf[500]="";
 _snprintf(buf,499,"\"%s\"\nNot Found.",DllPath);
 MessageBox(0,buf,"Error",MB_ICONERROR|MB_OK);
 ExitProcess(0);
 }

 InjectDLL();
 ReleaseMutex(hMutex);

 return 0;
}