Really nasty viruses, Trojans and other malware are rare on the Mac, but adware is more common and many people are irritated by adverts showing when they are not wanted. Remember the Flashback worm that infected 600,000 Macs a few years ago? It could happen again. There have been many cases of malicious software infecting Apple Macs and there is a chance that your computer could already be compromised. Could your your Mac part of a malware botnet? Is there adware or spyware on it? Where do you start looking for PUPs (potentially unwanted programs)? Let's look at the basics of security.
