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Help with CryptXXXX 4.0.

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#1 echoesofeleven


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Posted 08 January 2017 - 08:21 PM

I have a client that's been hit with this type of Ransomware. I was able to identify the type using the ID tool found on this forum. According to the tool, there is no known way of decrypting these files at the moment. 


Despite that, has there been any update regarding this particular type of ransomware? Is there a way that I could decrypt the client's files? 


Unfortunately, the client did not have a backup. I tried doing a system restore but all the restore points have been deleted. 


Currently, I am running tread micro's file decrypter. I'm not so sure that this method will work.  It's been running for over an hour now. 

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#2 quietman7


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Posted 09 January 2017 - 08:56 AM

Most crypto malware will typically delete (though not always) all shadow copy snapshots (created if System Restore was enabled) with vssadmin.exe so that you cannot restore your files from before they had been encrypted using native Windows Previous Versions or a program like Shadow Explorer. But it never hurts to try in case the malware did not do what it was supposed to do...it is not uncommon for these infections to sometimes fail to properly delete Shadow Volume Copies.

In some cases the use of file recovery software such as R-Studio or Photorec may be helpful to recover some of your original files but there is no guarantee that will work...again it never hurts to try.

Kaspersky Lab released Rannoh Decryptor, a free decryptor tool which uses a list of IDs and keys for victims of CryptXXX v1, v2 and v3 (.crypt, .cryp1, crypz files).

Trend Micro released a Ransomware File Decryptor which tries to figure out the key for victims of CryptXXX v1/v2/v3/v4/v5 but advises files encrypted by CryptXXX V3 cannot be fully recovered to 100% (partial recovery)...read the section titled "Important Note about Decrypting CryptXXX V3".

Kaspersky's decrypter tool cannot decrypt CryptXXX 4.x/5.x variants which use a random 32 hexadecimal characters (MD5 Hash).random 5 hexadecimal character pattern (i.e. 0412C29576C708CF0155E8DE242169B1.6B3FE).

There is an ongoing discussion in this topic where you can post comments, ask questions and seek further assistance. Other victims have been directed there to share information, experiences and suggestions.

Rather than have everyone with individual topics, it would be best (and more manageable for staff) if you posted any more questions, comments or requests for assistance in the above support topic discussion...it includes experiences by experts, a variety of IT consultants, end users and company reps who have been affected by ransomware infections. To avoid unnecessary confusion, this topic is closed.

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