What Nick said
My first suspect was gravity, e.g. mini landslides, or rocks rolling down the hill leaving tracks. Next frame to the right is a similar set of marks, but they're covered in rocks making them harder to see, and making the gravity hypothesis seem less likely. Interesting, too, there are no similar marks on the opposite side of the crater where the slope's the same and there's soft material. The gravity field's uniform, but the area probably has a prevailing wind direction that over time would tend to carve ripples preferentially on one side of a crater or a hill.