Wordpress : random base64 image?

We recently upgraded to the newest version of wordpress, and after someone made 1 post this random image showed up.

“kosa-target-image” doesn’t yield many relevant results. And all i can figure out is that it’s raw image data in bas64. But i have no idea at all how it got there.

screenshot

http://blog.mightymerchant.com/
Here’s a link to the blog, don’t make fun we’re going to design a better theme soon.

Thanks

<img id=“kosa-target-image” style=“border: medium none; margin: 0px; position: absolute; visibility: visible; color: transparent; z-index: 2147483647; left: 604px; top: 29px;” src=“data:image/png;base64,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” alt="" />