Blog posts hacked by S.W.T

Hi, it seems my site has been attacked by the group S.W.T

I’ve managed to get most of the pages working again but when I go into the blog section all the blog posts show a message from the hacker.

Example – https://www.ribbletrust.org.uk/2010/10/08/gudgeon-gudgeon-everywhere/

This is only happening on blog posts. I’ve deleted a rogue file from the template directory but it still seems to be calling the information in from somewhere.

Any idea how I remove this?