Kaspersky Lab advised those who do not use anti-virus products to restrict execution of certain files (C:\Windows\infpub.dat, C:\Windows\cscc.dat) and shut down the Windows Management Instrumentation (WMI) service. My note: let the wolf in the shed with sheep.

The source of the attack remained undetermined, but earlier this month the head of Microsoft, Brad Smith, pinned the blame for it on North Korea, which allegedly used cyber tools or weapons that were stolen from the National Security Agency in the United States. The top executive, however, did not provide evidence to back his claims.