The ornamental design for a hookassembly, as shown and described.
FIG. 1 is a perspective view of a hook assembly mounted to the broken line underside of a tabletop with parts broken away, as viewed from the right rear;
FIG. 2 is a right side perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a right side elevational view thereof, the left side being a mirror image.
The broken-line disclosure of elements in the views is for illustrative purposes only and forms no part of the claimed design.