Adding a Random component to CBC MAC in order to enlarge the tag space
First, don't roll your own crypto.

Second, why would you want to use CBC-MAC, if you have GMAC (GCM-mode) and CMAC and even better HMAC? (all of which are better than CBC-MAC)

Third, don't try to fix problems that have been fixed. (see second)

Fourth, I'm not aware of this construction being standardized and I'd doubt it has been. (see points 1 to 3)

Fifth, in fact there's a proposal that is similar to yours. Look here