What’s happening to my grape liquor?

Not sure if thus is the right sub for this post.

This is my first time making spirits at home, so bare with me. I made this batch with 4L of freshly squeezed grape juice, 1L of 40% alc. And 1kl of sugar. It’s been sitting in a cold dark spot for 4 days, but this weird cloudy goop has formed at the top. Can anyone tell me what it is, and if it’s still good? Is this some kind of mold?