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Cryptowall infection can anyone help


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#1 gus305

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Posted 01 December 2015 - 12:34 PM

Yesterday the data in my shared file was encrypted.  On of the network users says he was infected and instruction where left pay a ransom. 



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#2 gus305

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Posted 01 December 2015 - 02:35 PM

Help



#3 quietman7

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Posted 01 December 2015 - 04:23 PM

There are several variants of Cryptowall. CryptoWall 3.0 does not change the file extension of the file it encrypts and does not leave anything behind once it has finished encrypting and removed itself...the only evidence will be files (ransom notes) and registry keys. CryptoWall 3.0 leaves files (ransom notes) named HELP_DECRYPT.TXT, HELP_DECRYPT.HTML, and HELP_DECRYPT.PNG.

The original CryptoWall leaves files (ransom notes) named DECRYPT_INSTRUCTION.TXT, DECRYPT_INSTRUCTION.HTML, and DECRYPT_INSTRUCTION.URL. CryptoWall 2.0 leaves files (ransom notes) named install_tor.url. CryptoWall 4.0 renames files (0ausbffwh.p5, 72lcvn.iv6nn, x83o8x.ux7, etc.) and leaves ransom notes named HELP_YOUR_FILES.TXT, HELP_YOUR_FILES.HTML and HELP_YOUR_FILES.PNG.

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

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.

At this time there is no fix tool and Decryption of any 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. 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 are ongoing discussions in these topics where you can ask questions and seek 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 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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