House Of Tsang Classic Stir Fry Sauce Flavor

I'm not looking for a clone of this sauce as much as I'm trying to figure out the taste signature. Despite the label, I can taste dark soy sauce, ginger, garlic. The label indicates sesame & Cottonseed oil, dried onion, vinegar, and sherry along with thickeners, stabilizers, and flavor enhancers along with the others, but doesn't mention dark soy sauce.

The flavor is not unique to this product. I've tasted a similar flavor used in Asian wraps, subs, & rice bowls and Chef's signature plating sauces as a Teriyaki flavor. Uncle Ben's Frozen Broccoli and Beef Rice had a similar flavor sauce.

I have little experience with Asian cuisine, but in the years of making up soy based stir fry sauces and marinades, I've used most of the above ingredients in many combinations and never had anything approximate or even hint of this flavor.

Has anyone any clue to what makes this taste over the usual combination of Soy sauce, garlic, ginger, Chinese cooking wine, and sesame oil?