Cybereason Principal Security Researcher Amit Serper discovered a work around solution that disables the NotPetya ransomware. To activate the vaccination mechanisms users must locate the C:Windows folder and create a file named perfc, with no extension name. This should kill the application before it begins encrypting files. Ukraine businesses have so far beared the brunt of the attack. The attack shares some of the functionality of the Petya family, but cannot be conclusively tied to that family as of yet.”]