Petya ransomware is spreading swiftly this morning, mainly in Europe so far, although it is already being detected/reported in America as well. Like WannaCry, it infects your system and encrypts your files, then pops up a notice telling you to pay a ransom in Bitcoin to gain access to your files. Unlike WannaCry, it infects your Master Boot Record, preventing your computer from even booting up. Once it has been downloaded on one machine, it can spread swiftly throughout the network to other PCs and servers. (If you’re feeling geeky, more in-depth details can be found here and here.)
At this time, it appears that it is mainly coming in through infected email attachments, particularly attachments that look like Microsoft Word documents, so once again, the best protection is to avoid attachments. If you are not expecting an attachment from someone, even if it appears to be from a friend or colleague, don’t open it. If you think it may be important, give them a call and verify that they intended to send you something.
As always, please let me know if you have questions or concerns.