What they would do is “trespass” you, effectively banning you from the MOA for however long they wish. That’s what they do if they discover one is leagally carrying a handgun with a carry permit. By law, they cannot post the MOA ,but they do anyway. Individual tennants may post their store, if they so choose. None do. So, they just kick you out and tell you never to return.
What is a MOA? The only acronym I know is Military Operations Area that you find on air nav charts and I don’t think the mall is that kind of MOA.
Would the mall ban me or the DHS?
Sounds like a lawsuit opportunity.