Follow cake mix instructions to bake 24 cupcakes then cool cupcakes completely.
While cupcakes are baking, heat 2" water to a simmer in a small saucepan. Place a heatproof bowl over the water. The bowl should not touch the water. Add chocolate wafers to bowl then stir until melted and completely smooth. Place a parchment-lined baking pan next to melted chocolate, then dip pretzel ‘antlers’ in chocolate and transfer to baking pan. Set aside.
When cupcakes are cool, frost with chocolate frosting. Place chocolate sugar on a small plate then dip frosted side of cupcake in sugar to cover completely. Set aside.
Line up 24 mini wafer cookies and 24 red candies. Using a toothpick or tip of a pairing knife, dab a bit of frosting on a candy then attach to a wafer cookie a bit below the center. Frost the back of the wafer cookie then attach the ‘nose’ to the cupcake.
Dab frosting to back of each eye and attach. Then insert pretzel antlers and serve.