The site was hacked sometime on Saturday early evening. I tried to bring the data back to the same time on Saturday night, but didn't have any luck. After working on it for a few hours, it seemed like it was going to be quite a bit of work and perhaps not possible without it being down for a prolonged period of time and many more hours of investigative work. So I restored it to the last backup, which as on Dec 3 at 10:00 PM.
The software needs to be updated to the latest, because it's way outdated and vulnerable. Or we continue to rely on duct tape and baling wire. Cross your fingers...