To your question, it will be very difficult to decrypt the files
the malware encrypted (unless it's using the same encryption key
and someone managed to discover it) and I suggest that you remove
the HDD from your system, plug it into another as an external HDD
(make sure AutoRun is disabled) and pray that file recovery can
save the remaining important documents on your HDD. I'm not too
sure whether MBAM helps here since this malware is quite
new, but you can give it a try.
This shit is recognized by ESET (creators of NOD32) as a ransom
trojan - which means, like a kidnapper, it kidnaps your important
files, put a password on it, and then demands $$$ from you in order
for you to unlock the files. Those interested can learn more about
its behaviour here:
http://www.eset.eu/encyclopaedia/bogoj_b_trojan_ransom_vb_a_randsom_a_ransom_trojan?lng=en
Please note that this malware can spread via thumbdrives, so my
advice to you is avoid plugging yours into other computers unless
AutoRun is disabled.
It seems like the economy crisis is so bad, people have to
resort to doing such stupid shit to get $$$. After some Googling, I
realized that most victims are Singaporeans. So I suppose the
asshole who wrote this malware must be one too.
http://www.google.com/search?q=Brandos87
And hey, Chris, you're not alone. Someone's got a worse shit
than you:
http://zyclone.wordpress.com/2009/02/16/bloody-idiot-seriously-i-hope-you-die/