it sounds like you don't have properly functioning weep holes in the brick veneer. Either they were never left in plsce, or they are cloggd with debris. have mason check for rthem.

Concrete does not mold.

Mold requires heat. moistures, and foodto grow, Remove any of the three, and it will not propagate. you probabluyw ant he4at in your house, so that leaves the other two. Concrete is not a food for mold, but the dust that settles into it is. SCRUB IOT DOWN WITH BORAXO

Boron is a natural deterant to mld growth.

But you still need to deny entry to that water.

Excellence is its own reward!