Serious issue with trojan

OK, I’m pretty new to running websites and a downright n00b. I have run into a serious problem yesterday and not a clue how to solve this. It appears my site has been infected with a trojan virus called Kryptik.ABY? I cannot access my Wordpress site nor the admin panel. I have currently taken it down until I figure out what to do next.

Help please?

The first thing I would do is check and verify this is true.

If so, the best thing to do is assume your files are infected, and remove them. I tend to lean towards the scorched earth methodolgy, and just delete all the core WP files:

Make a backup of everything and get started with removing anything that could be infected. When you’ve restored things, remember to change all your passwords. Finally, run a scan on your PC to make sure that’s not the problem.