Should dry salami develop green mould?
Take the salamis out of the bag.

Are they complete sausages or has it been sliced? Whole sausages should not be kept in a plastic bag without desiccants even if it's just a ball of paper towels.

Sliced salamis shouldn't be kept for more than a couple weeks.

If they are whole, don't be fooled that you can just wash the skin, molds grow tendrils into its food, not unlike roots, so don't risk it.