Vaccine, not Killswitch, Found for Petya (NotPetya) Ransomware Outbreak
https://www.bleepingcomputer.com/new...ware-outbreak/
If already affected dont restart, encryption made during restart.
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from the tips:
This means victims can create that file on their PCs, set it to read-only, and block the NotPetya ransomware from executing.
How to Enable the NotPetya/Petna/Petya Vaccine
To vaccinate your computer so that you are unable to get infected with the current strain of NotPetya/Petya/Petna (yeah, this naming is annoying), simply create a file called perfc in the C:\Windows folder and make it read only. For those who want a quick and easy way to perform this task, Lawrence Abrams has created a batch file that performs this step for you.
for this batchfile read in above link