Rent a center lock

So I bought this S5 on craigslist, imei number is clean, but an app called sec.abt locks me out of the device. Tells me to call rent a center which I did but they weren't sure what I was talking about. Is it a part of Knox? What is sec.abt?

I flashed CM12.1 and I bypassed the issue but when I restore touchwiz it freaks out again.