March 1, 2017 - On Valentine's Day, Mac users got a special "treat" in the form of new malware. Now, weeks later, there are signs of yet another piece of malware looming. This brings the count of malware (as opposed to adware or other threats) discovered for macOS this year up to 4, in only two short months.
February 28, 2017 - The Findzip ransomware was discovered on February 22, 2017. At that time, it was thought that files would be irreversibly encrypted by this ransomware, with no chance of decryption. Turns out, that's not quite true.
November 30, 2016 - Update (12/13/2016): Apple has added a Report Junk link on iCloud.com, to allow you to report these spam events as junk. Use this feature to remove the events at this point. It is a good bet that Apple will add a similar option to the Calendar app on macOS and iOS in a future update....
July 13, 2016 - A new piece of malware was a found: OSX.Keydnap. Interestingly, it turns out that this malware could be in some way related to some prominent Windows banking malware. The new Mac malware known as OSX.Keydnap installs via a new twist on an old theme. The "dropper" comes in the form of a harmless document.