I'm starting this new topic following a discussion on this former topic posted by someone else (http://www.bleepingcomputer.com/forums/topic456569.html).
I have the same issue than described in the initial post, meaning : all files from several specific types (.txt, .xls, .doc, .jpg, ...) have been "encrypted" in a ".crypt" format (for exemple if my initial file is called "hello.txt", the file I would have now would be "hello.txt.crypt"). Original files have of course been deleted and trying to rename files by removing this extension do not work at all (I also tried to bring one of the file in another computer to open it but it's still not working so my conclusion is that the files have really been encrypted).
For each folder where some of my files have been encrypted I can now find a new "WARNING.txt" file where I can find the following "instructions" :
YOUR ID: 602
YOUR COMPUTER IS BLOCKED. All your documents, text files and databases
are securely encrypted.
You can unblock your computer by completing three easy steps.
STEP 1: Buy a MoneyPak in amount of $50 at the nearest store.
STEP2: Fill out the fields on the black screen on your cumputer. Otherwise
send as an e-mail at email@example.com. Indicate your ID in the message
title and provide MoneyPak number.
STEP 3: Check your e-mail. We will send you a program to remove the malware
and decrypt your files once payment is verified. Your computer will roll back
to the ordinary state.
Q: How I can make sure that you can really decipher my files?
A: You can send ONE any ciphered file on email firstname.lastname@example.org
(Indicate your ID and /test decrypt/ phrase in the message title), in the
response message you receive the deciphered file.
Q: Where can I purchase a MoneyPak?
A: MoneyPak can be purchased at thousands of stores nationwide, including
major retailers such as Walmart, Walgreens, CVS/pharmacy, Rite Aid, Kmart,
Kroger and Meijer.
Q: How do I buy a MoneyPak at the store?
A: Pick up a MoneyPak from the Prepaid Product Section or Green Dot display
and take it to the register. The cashier will collect your cash and load it onto
https://www.moneypak.com/StoreLocator.aspx - here you find a store near .
I alread tried to launch a system restauration but I just receive an error message explaining that system restauration "do not seem to work" (I've got the french version of windows so this is only translation).
I also tried a "decryption" program proposed by forum members (http://www.bleepingcomputer.com/forums/topic455347.html/page__p__2718675#entry2718675) but it's not working, probably because this is a new variant of the program.
As requested by some of the members from the forum, I create my own topic with DDS log results attached.
I just would like to specify that I really think this is a new version of the malware because yesterday morning I had a lot of difficulties to find information on it on google while not a lot of people since that have requested help on the same topic (see my first link).
Please do not hesitate to ask any question. Of course my files are for me very precious because they represent days and days of work and some contains very important data to me.
Thanks a lot for your help and really sorry to disturb.