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cryptowall 3 files on external disk


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#1 johnyp

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Posted 19 July 2015 - 03:32 AM

Hi, a client brought my on an external disk a copy of all his files. Most of them got encrypted by cryptowall 3 but not all of them. I don't have access to registry or to the PC that got affected. Is there any way to identify infected only files? I also have the decrypter from the hacker, how this decrypter works? Does it needs the registry list or can I just put all files to the same folder and it will just decrypt them? Will it try to decrypt the unencrypted files also so it will destroy them?
Thank you.

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#2 Firehouse

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Posted 19 July 2015 - 03:49 AM

Encrypted files usually have random character extension,others mostly have regular extension. Not sure how decrypter works,but you can try it though. If that didn't help,those files are lost forever.



#3 johnyp

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Posted 19 July 2015 - 03:54 AM

Cryptowall 3 doesn't apply new extensions, encrypts the files retaining file names! Anyone that knows how decrypter works!

#4 Firehouse

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Posted 19 July 2015 - 04:10 AM

I just wanted to say that files are encrypted and renamed with random extensions and only fool will use decrypter. You're some sort of "technician", you know how decrypter works :P

 

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#5 Sintharius

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Posted 19 July 2015 - 04:15 AM

If you need to identify the encrypted files, your best bet is to gain access to the machine's main drive (which contains the registry) and run ListCWall on it. That should give you the list of CryptoWall 3.0 encrypted files.

As for the decrypter, I suspect that it might use information in the registry to determine which files to decrypt, so again you will want to have the drive with the OS installed on it for that. :)

#6 quietman7

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Posted 19 July 2015 - 06:13 AM

A repository of all current knowledge regarding CryptoWall, CryptoWall 2.0 & CryptoWall 3.0 is provided by Grinler (aka Lawrence Abrams), in this topic: CryptoWall and DECRYPT_INSTRUCTION Ransomware Information Guide and FAQ

There are also ongoing discussions in these topics:Rather than have everyone start individual topics, it would be best (and more manageable for staff) if you posted any more questions, comments or requests for assistance in one of those topic discussions. Doing that will also ensure you receive proper assistance from our crypto malware experts since they may not see this thread. To avoid unnecessary confusion...this topic is closed.

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