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Symatec's specialists found the way to protect from new ransomware called "Petya" that recently attacked computers all over the world.
— Security Response (@threatintel) June 27, 2017
In the moment of attack, Petya looks for C:\Windows\perfc file on victim's computer. If there is such file on the PC, Petya doesn't infect the PC.
In order to secure your PC, you can create this file just using the "Notepad". Also, different sources recommend to create just perfc file, without extension and another recommend to create perfc.dll file.
Yesterday, ransomware called Petya attacked thousends of computers all over the world. It locks victim's PC and demands 300$ in Bitcoins to unlock it.