Mac malware can hide commands in your iCloud calendar

You probably use your calendar to keep track of appointments, birthdays and the occasional reminder you immediately snooze. Hackers apparently see another possibility. Security researchers have uncovered a new version of MacSync malware that can use a public iCloud calendar event as part of its infection chain. Hidden inside the calendar data are commands that help download more malware onto a Mac.

The calendar itself does not suddenly infect your computer because someone sent you an invitation.