This is as far as I could get:
It's too broad modeling task to describe every step, that's why I used a screencast keys in my .gifs. Begin with extruding the cube horizontaly, then subdivide it using edge loops (Ctrl+R). Add a circle (with 8 vertices) and bridge the extruded cube's end with it (W-->LoopTools-->Bridge). Your base mesh is ready. Rest is a matter of using blender modeling tools to tweak some vertices as pictured below.
Try extruding the top, rotating, and extruding again to make the handle then alter it in sculpt mode.