A massive ransomware campaign hit computer systems of hundreds of private companies and public organizations across the globe – which is believed to be the most massive ransomware delivery campaign to date.

The Ransomware in question has been identified as a variant of ransomware known as WannaCry (also known as 'Wana Decrypt0r,' 'WannaCryptor' or 'WCRY').

Like other ransomware variants, WannaCry also blocks access to a computer, encrypts its files and demands money (bitcoin) to unlock it.
Once infected with the WannaCry ransomware, victims are asked to pay up to $300 in bitcoin in order to remove the infection from their PCs; otherwise, their PCs are render edunusable, and their files remain locked.

How to Protect Yourself from WannaCry