Malware Warning Popup won't go away

I have a popup for "DragonDrop" will damage your computer. You should move it to the Trash. No matter how many times I press Move to Trash or Cancel, it just pops back up.

I am pretty versed in manually removing Mac malware, and have already checked the 3 important folders, and see nothing suspicious. I have also run Malware Bytes with no malware found.

There were a few shady Chrome extensions, which I removed. Otherwise, I am sorta stumped on this one... Any ideas?