The usual hacking culprit is olde code that has had a major weakeness public revealed getting exploited. The most common these days seems to be wordpress, vbulletin, and content mangement software such as joomla.
If your hosting company is managing their end even reasonably. There usually isn't many holes left open on their end. As soon as you install a third part piece of software, especially one that is popular and public exposed, you then get the lucky job of trying to keep up with all the security fixes.
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