One of the first real threat under Linux has been identified: this is not a virus but a trojan.
It’s serious but it’s not the end of the Linux world.
As long as you pay attention to what you run on your Linux box (no unknown script download, or installation of shady PPA), you will not be at risk: basic caution steps are mandatory … but no more ! !
More information on Secure List and on OMG! Ubuntu!.