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Your site was hacked. Change all of your passwords - cPanel, email, FTP, database, administrator account - and reupload all of the javascript files in ./jscripts/ from a fresh download. All of your javascript files have been injected with malicious code. You should also reupload any javascript files from plugins such as thx.js, myalerts.js, etc..
You should then check your raw access logs to find out when and how the attacker gained access. Perhaps you were using an older version of MyBB or a plugin? It's important to know how they got in to ensure the issue is patched.
I would highly advise scanning your computer for malware in case you have any malicious software installed.
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I'd also check with your bank for any payments made from your account which you haven't authorized. Apparently a lot of sites have been hit with this attack and many people are having their banking details stolen.
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2012-11-04, 12:55 PM
(This post was last modified: 2012-11-04, 12:55 PM by Nathan Malcolm.)
Only the javascript files have been injected from what I can see, but you should run a File Verification from the ACP to make sure no other files have been modified.
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ACP > Tools & Maintenance > File Verification
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