A large cyberattack involving ransomware that spreads laterally through corporate networks began on June 27, 2017. It affected several large enterprises and attracted a lot of attention from people all over the world. Kaspersky Lab’s products protect computers from the threat (which we named ExPetr for its similarity to the well-known Petya ransomware). Here we demonstrate how, exactly, we protect your files from Petya / NotPetya / ExPetr (as well as other ransomware).
More technical details regarding this threat: https://securelist.com/schroedingers-petya/78870/
Advice on how to protect your files: https://www.kaspersky.co.uk/blog/new-ransomware-epidemics/11249/