Masking/movieclip issue

Issue: I have a image that is masked to only reveal square piece of the image. This image in turn is within a movieclip. the image that I am masking cannot be sliced. The movieclip that the image is in is part of a hitTest action. What is happening is the whole image within the movieclip is being detected with the hitTest of the movieclip. Is there a way to have only the masked square area of the image withing the movieclip be the hitarea instead of the whole image being part of the hitarea?