This article was posted on the SophosLabs Blog earlier and its serious, regarding Troj/FakeAV-AAB
This was headed toward Firefox browsers but You never Know it may be unleashed on other Browsers with no Notice
The article is entitled:
FakeAV Generates Own Fake Malware
It starts...

quote:

We’ve all seen FakeAV applications deliberately misreporting malware detection and encouraging the user to buy their “products”. The slew of these fake anti-virus applications has been relentless. My colleague, Pete, has highlighted the importance of taking adequate measures to ensure that you do not fall for such scams.
This FakeAV ups the ante further.

Then it shows what happens when the Person conducting the test on a "Protected" computer
found in Screenshots
NOTE There is NO solution given if you are unlucky to be infected ...Sophos only reveal the New threats
Nearest Sophos will do, is point you toward a solution on this link The rest is up to HiJackThis Readers on Forums to interpret to restore order (its an "expert" job)