1. Could be any number of ways in, from an installed unsecure hack to just a poorly written one, could also be a server security hole as well.
I would suggest you view your web server logs for any details of injection or other wise.
2. Due to the hacker changes, it could anything from a db change to a template change to a file change. You will have to check all 3 to see what was added.
3. There is no need to import any backups.
4. I would suggest you upgrade vb and all hacks/addons you have installed.
5. Upgrade the server backend, as well as apache, sql & php.
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