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Infected with Cryptowall


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#1 wep1981

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Posted 17 December 2015 - 04:01 PM

Hello all. One of my employees downloaded an attachment from which she thought came from a legit email. Well after a while her files were gone and replaced with HELP_YOUR_FILES.png and files with ext. d2k,e5vt,8tu,1iaiq,5f. I tried CoinVaultDecryptor and XoristDecrypto. Nothing seems to be working. Of course the virus infected a Mapped drive and some files. I tried Shadow explorer, previous version etc. 

 

Is there any tool out there that will decrypt the files. I believe it its cryptowall 1.0. How do I found out? Is there any way to upload a encrypted file and try to get the key? 

 

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#2 quietman7

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Posted 17 December 2015 - 04:44 PM

There are several variants of Cryptowall.

CryptoWall 4.0 leaves ransom notes named HELP_YOUR_FILES.TXT, HELP_YOUR_FILES.HTML and HELP_YOUR_FILES.PNG and will encrypt the actual filename of an encrypted file as well as the data contained in it. Each encrypted file will have a unique name with random characters (0ausbffwh.p5, 72lcvn.iv6nn, x83o8x.ux7, etc). CryptoWall 4.0 uses a .JS file to download and execute a file from the %temp% folder. The initial installer injects the program that actually encrypts data into explorer.exe/svchost.exe. More information in this BC news article...A repository of all current knowledge regarding CryptoWall, CryptoWall 2.0, CryptoWall 3.0 & CryptoWall 4.0 is provided by Grinler (aka Lawrence Abrams), in this topic: CryptoWall and DECRYPT_INSTRUCTION Ransomware Information Guide and FAQ

Cryptowall typically deletes (though not always) all Shadow Volume Copies with vssadmin.exe so that you cannot restore your files via System Restore, native Windows Previous Versions or using a program like Shadow Explorer...but it never hurts to try in case the infection did not do what it was supposed to do. Another possible option is to try file recovery software such as R-Studio or Photorec to recover some of your original files but there is no guarantee that will work.

Unfortunately at this time there is no fix tool and decryption of CryptoWall files...is impossible since there is no way to retrieve the private key that can be used to decrypt your files without paying the ransom. For a more detailed explanation, read this reply by Nathan (DecrypterFixer). The only other alternative is to save your data as is and wait for a possible breakthrough...meaning, what seems like an impossibility at the moment (decryption of your data), there is always hope someday there may be a possible solution so save the encrypted data and wait until that time.

There is an ongoing discussion in this topic where you can ask questions and seek further assistance.Rather than have everyone start individual topics, it would be best (and more manageable for staff) if you posted any questions, comments or requests for assistance in that topic discussion. 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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