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Interesting, but I wouldn't worry about it.

Pay attention to where you download content, making sure that is reputable, should avoid anything like this.

Know what you are installing before hitting that button.
 
I should think you can safely ignore this article. What gave it away was this paragraph:-

"Clearly, Mac users - like their Windows cousins - should practice safe computing and only download software from official websites and legitimate download services,” according to Graham Cluley, an award-winning security blogger and senior technology consultant at Sophos security."

This marks it out as a typical "scare" article placed by Sphos the so-called security company who promote their products with articles such as this and aimed at uninitiated Mac users.
 
There is a certain amount of scare tactic here.
There is a certain amount of complete truth to this article
There is a certain amount of common sense required when using a computer and downloading content from anyplace online.

Just use your brain. If it doesn't feel right or something asks you for a password to install and you don't know what that something is, DON'T DO IT.
 
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