Just thought you might be interested in a similar problem that I have been investigating.
I don’t use WordPress, but have several sites built on Joomla. One of these suffered problems two weeks ago, the main thing being a script called easystats analytics.
Most of my sites are hosted by Fasthosts and are all OK. However, the site which was affected is not with Fasthosts, but Namesco!
Coincidence? I’m not convinced. I think I’ll have a word with Namesco and see what they have to say.