[Yosemitest]

I've run "Malwarebytes' Anti-Malware 1.46" with a recent update and it didn't detect it.
But "Online Armor++" detected it.

[driftdiver]

I googled it and found a few sources saying it was a false positive.

[driftdiver]

Its a valid trojan so never mind about the false positive. Manual removal instructions here http://www.spywareremove.com/removePackedWin32Krapag.html

It will log key strokes and download other software.

Do a boot time scan and your AV should remove it.