There's an ongoing wave of spam that automatically adds calendar events into your iCloud accounts. The issue, besides being annoying, is that it's not easy to delete the events without rejecting them, which will send a confirmation that your email is valid back to the spammer.
Nivdort, also known as Bayrob is an information stealing trojan that is used to extract personal and financial information from the systems it infects. This malware family has been around for almost 10 years (it was first discovered in March 2007), which is a very long life for a malware family and, although it has appeared in the media a few times during these years, it is still relatively unknown to most people.
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Bolek is a recent malware from the Kbot/Carberp family. We first heard about this malware from the cert.pl blog post in May 2016, and since then, a few others have published additional information about it (links below).