Site (I didn't build) got hacked, lots of data deleted, trying to find out what happened before we restore backup.

Check admin access, lots of blank login submissions from a few similar IPs. Looks like they didn't brute force it.

Check request logs, tons of requests at different admin pages. Still doesn't look like they were targeting the login page.

We're looking around asking ourselves "how did they get in?"

I notice the page with the delete commands has an include file called "adminCheck".

Inside, I find code that basically says "if you're not an admin, now you are!" Full access to everything.

I wonder if the attack was even malicious.