Do muskrats attack humans in the water?

I guess so because one is living under my shed! We live about 2 blocks from a lake so maybe it's a little bit lost... a few times a day I see him/her making a mad dash from the yard next door, on one side or the other, into the little space under our shed. Then it turns around and rests there with its head sticking out enjoying the day. It really is cute. I just hope it's not causing any damage...haven't gotten close enough to check out the situation yet.