AoE as frost is fairly easy. Open with a DnD, IT, Pest, HB. Prioritize HB over Obliterate.
As far as your spec, try the spec that vine posted. 0/2 Chill of the grave is bad. Your hardest hitting ability uses Runic Power (Frost Strike), as does your highest threat (Rune Strike). You're really RP starved with that spec, and that's why your threat is low. 1/5 Blood of the North isn't a great idea either, as you want the death runes for obliterate spam (see Chill of the Grave), and the extra 20% damage from Blood Strike can't hurt.
I'm not a fan of glyph of UBA, but if you really need the mitigation then keep it. At the very least, drop the DnD and DC glyphs (if DC fails, you still have death grip, which is a taunt!), and replace them with Frost Strike and Obliterate.
Luck is what happens when preparation meets opportunity. -Seneca
Everyone marvels at a square egg, but only the chicken understands the PAIN.