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The server my site is on was infected using the (pardon my obfuscation)

 Y-E-S E-x-p-l-o-i-t S-y-s-t-e-m

It is a "control kit".

I found out some info about it from

How can I remove this control kit and secure the system? Trojan scans reveal an infected GD library.

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up vote 4 down vote accepted

Reinstall the system. It sucks, but that's the only way you'll be sure its secure.

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Oof, that's annoying. How do I do that? – Cyclone Nov 2 '09 at 18:33

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