[ranka]

Fold preflop. As you said, these guys are unknowns and you can't even guess their ranges. Maybe button is a nit and he don't raise (steal blinds) without a real hand. Maybe they are loose stations who are ready to gamble. Why you risk? Why? You are SB and why you are protecting your SB with a quite weak hand against unknowns. So, its very clear fold to me.

As played, I would check/fold flop. As Sounded Simple said - its 3way. But I want to add: As I already said - they are unknowns and now you completely missed your flop. You don't have clue what is their range but I think ace is in their range. Just check/fold the flop.

Shortly: I don't recommend to protect your blind (especially small blind) with a weak hand against unknowns.