Mold from exterior water intrusion.

[Nick Thompson]

I submitted an offer on my first flip today. The main concern I have, and the reason I assume the house hasn't sold yet, is mold in the first floor walls. It is only in four or five spots, and I'm confident that it won't be that hard to remove. 

The house is on a slab, and the siding goes basically all the way down to the ground, which is not graded at all. I was wondering if it's OK to run the dirt up over the siding a few inches to create a proper slope? There is some siding damage on the bottom row, and I assume this is causing most of the mild issue, but I want to make sure there won't be a problem for the future owner. 

There looks to be adequate gutters and downspouts. I'm located in mid Michigan if that helps.