Stupidest virus ever.

Preferences -> Customize Your Blog -> Under ‘Theme’ is Edit HTML. Click that.

At the end of your </body> (when you scroll down) there will be a <script> with some wtf characters in it. That’s the virus. Delete it from <script> to </script>, leaving </body> and </html>.  (If you delete </body> or </html> you will fuck up your theme). 

That’s it. Have fun.

edit: it’s a bit clearer now, hope I helped.