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Windows Update Catalog:
http://www.catalog.update.microsoft.com/Search.aspx?q=KB4012598
Windows Defender:
https://support.microsoft.com/en-us/help/17464/windows-defender-help-protect-computer
More on WannaCry Worm:
https://www.troyhunt.com/everything-you-need-to-know-about-the-wannacrypt-ransomware/
