I've also run Malwarebytes, TDSS Killer, and [b]iObit Malware Fighter[/b], and none of them has picked up anything. (Malwarebytes and iObit have caught things in the past.)

IOBit info
http://www.malwarebytes.org/forums/index.php?showtopic=29681
http://www.malwarebytes.org/forums/index.php?showtopic=30989
http://www.malwarebytes.org/forums/index.php?showtopic=33217