Remove the membrane from the back of the beef ribs using a butter knife to lift the edge, gripping it with a paper towel, and pulling it off.
Mix the brown sugar, smoked paprika, kosher salt, black pepper, and garlic powder in a small bowl. Apply the dry rub evenly across all sides of the ribs.
Preheat your smoker or grill to 250°F using hickory, mesquite, or applewood for smoke.
Place the ribs bone-side down on the grates. Smoke for 3 hours, spritzing the meat lightly with apple cider vinegar every hour to retain moisture.
Remove the ribs from the smoker. Wrap them tightly in heavy-duty aluminum foil, pouring half of the barbecue sauce inside the wrap. Return the wrapped ribs to the smoker for 1.5 hours.
Carefully unwrap the ribs, brush the top with the remaining barbecue sauce, and place them back on the smoker uncovered for 30 minutes until the sauce is sticky and caramelized.
Remove from the smoker and let the ribs rest for 15 minutes before slicing and serving.