The issue focused on software distributed under Microsoft Windows 10. Many devices run Windows 8.1 and Windows Server 2012 R2. For PCs, computers running Windows 7 or Windows Vista were affected by the malware.

However, PC systems running Windows 8.1 or Windows Server 2012 R2 can still be infected with malware if Windows Installer software was installed before Windows 10 was released. Windows Installer software cannot install Windows updates from Microsoft's servers. Windows Installer software does not update Windows machines that have Windows Update