Mix the dry rub by combining brown sugar, paprika, salt, black pepper, garlic powder, onion powder, cayenne pepper, and dried oregano in a mixing bowl.
Carefully remove the membrane from the back of the pork ribs.
Generously coat both sides of the ribs with the dry rub mixture and wrap in plastic wrap; refrigerate for at least one hour or overnight.
Preheat the grill to a low temperature between 225°F to 250°F.
Place the ribs on the grill bone side down and cook for 3 to 4 hours.
Use a meat thermometer to ensure the ribs reach an internal temperature of 190°F to 203°F.
Once cooked, remove the ribs from the grill and let them rest for about 10 minutes.