From the turnoff to Schöneben, turn left in the open field parallel to the forest path to the Hauserbauerhütte. There, a little to the left, a short steep climb to the Zirbeneck and following the ridge (summer path markings) in the gentle, loose terrain to the tree line. From there, continue along the back to the Sandkogel and over the shoulder to the Greim summit cross.
Downhill and uphill!