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In a medium Saucepan over medium-high heat, make a gastrique by bringing the dark brown sugar, molasses, white vinegar and Worcestershire sauce to a gentle boil.
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Once at a gentle boil, remove from the heat and add the mustard, garlic powder, onion powder, cayenne, black pepper and paprika powder. Let sit for 15 minutes.
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Stir in the ketchup and return to the stove, and simmer over low for 30 minutes.
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Remove from the heat and add the basic bbq rub.
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Let cool and then refrigerate for up to 1 month.