If you can, look through your access_logs to see if you can see what they did to get hack the site (if it was through a mod). If you don't have access to the logs, you should ask your host for them soon because they might not keep them for long at all.
Go read the threads for all the mods you listed and see if any security issues have been brought up. Were you up-to-date on all the mods?
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