Bad or inappropriate software of all sorts can do that. Security software is no different.

My dad keeps trying to install security software which he discovers through pop-ups on Korean websites.

Fortunately, I bought him a Mac, and most of that stuff is a *.exe file. Unfortunately, this is not enough! :(

Yep. Unfortunately, this is becoming more and more true. Typical computer users just don't know the difference between "safe computer use" and "unsafe computer use."

It's the same as human viruses. If you do things that are safe, you dramatically reduce your chances of infection.