How many miles?
It looks very unusual... My guess is it looks rusty looking, maybe something to do with the cooling system IF it's from your Murano... Has anyone else parked in that spot?
It looks to me like coolant that has a bit of oil in it. Is this the first and only instance? Could it have come from the coolant reservoir overflow? If the water in the tank is this color I would guess a head gasket leak.