Indeed, the crack was caused by the movement of the support. You can examine the foundation by digging or opening up the interior (wood frame) wall to check the sill plate, which will not be in full contact with the foundation if it has settled.
If the wall is constructed of brick, as opposed to the brick being a façade, then yes, you have foundation movement. Whether it's still moving, and whether it's something that needs to be addressed urgently is anyone's guess with the little information we have. You'll need to investigate the foundation situation to learn more.