All sited re-direct

All my sites redirect to this url:

[removed]
My domain index.htm / index.html and index.php files were all changed to this URL as well as my htaccess files.

Since I host more that 15 sites on the Arvixe server I assume that this infestation did indeed come from them.
Unfortunately all the sites affected are wordpress installations. No Moodle installations were affected.
Is there a version I Moodle that has a security issue? I have googled this and this problems seems to be 10months old.
Wonder if my hosts Arvixe had security in place, I did nothing on my site, no installs no changes no activity and next thing it resolved to the trading site.

Any ideas what the issue might be: WP version, or Security on hosting site?
I will have to reinstall everything, I assume.