It looks like periwinkle (vinca minor). I made the "mistake" of buying the patented variegated one with purple flowers (three plants in a tiny pot) and it is trying to take over too. It's laughable that they came with a statement that the plant is patented and propagating the plant is illegal.
Before I realized this, DH brought home a clump of plain green leaves one and planted it in the back yard and that one, too is threatening to take over my native shade plant garden. Ugh!
I ruthlessly rip them out -- you have to find where they touched down and formed what I call "outposts" with deep and tough root systems. The young satellites from those are not too hard to pull up, but those need a digging tool. Roots pull out easier out of wet soil rather than breaking.