Petya Kill Switch

• Apply updates – http://www.catalog.update.microsoft.com/Search.aspx?q=KB4012598
• Disable SMB V1 as a quick fix by issuing following command: dism /online /norestart /disable-feature /featurename:SMB1Protocol
• To apply the Kill-Switch for Petya ransomware, create a file in c:\windows called perfc with no extension