If the weight of the machine is carrried by the stand on the floor and you're just trying to stabilize the stand to the wall, then some tapcons held in with some two part Simpson SET epoxy from would work. If you can get the stand flush to the wall, you can epoxy it to the wall as well.
If you can position the stand where you can access the vertical mortar joints, you can use 1/4" or 3/8" diameter Redheads with some Simpson SET epoxy as well. This would be the strongest area to work with as the head joints should be filled with mortar.
SET High Strength Epoxy-Tie® Anchoring Adhesive ~ Simpson Strong-Tie Anchor Systems®