Deleting pop-ups on my desktop?

I've been getting weird pop-ups on my desktop at random times and don't know if it's adware or what. Any suggestions? It's important to note that I'm not always using a browser, etc. when this happens and I've already disabled plugins on my browsers to prevent pop-ups. Anything for desktop pop-ups? Cheers!

pop-up.jpg

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howapple - hello

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Download and run MalwareBytes. Malwarebytes was developed by one of our own colleagues here in ASC. It's is used by Apple Geniuses at Apple Store Genius Bars. It is also recommended by Apple Community Hosts here in the forums, as well as by Apple Telephone Support agents.

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