Ransomware doesn’t sneak into your PC like ordinary malware. It bursts in, points a gun at your data, and screams for cash—or else. And if you don’t learn to defend yourself, it could happen again and again, as the Petya (or NotPetya) outbreak is demonstrating.
A form of ransomware similar to a piece of malware called Petya has attacked the Ukraine and other sites around the globe, encrypting files until a ransom has been paid. Researchers, though, have moved quickly to block the spread of the ransomware, also known as Petrwrap, exPetr, Petna, and SortaPetya. There's no real way to remove the Petya ransomware, but researchers have come up with a way to "immunize" your PC, and malware companies are already working to block it.