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CryptXXX and Ransom note / decryption ID


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#1 Blobbaba

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Posted 03 January 2017 - 09:10 AM

Hello. My name is Alex. I came here searching for help with a hard drive that has been left for decryption. I've searched all over and finally I found that the cryptovirus that  encrypted the files is CryptXXX. I used the website https://id-ransomware.malwarehunterteam.com to find all I need. So I understood that it is possible to decrypt the files and for that I need RannohDecryptor from Kaspersky. The only problem is that i don't have the Ransom note, which is a total disaster. Right now I tried to speak with the person whom hard drive is, but there is no response yet. Only this hard drive is infected, not his whole PC. Whatever, I kept searching for another way and somewhere (saying that, because I lost the website oh my god) that you CAN find the decryption ID if you have one file with one copy that is encrypted and one copy that is not. So, again, I was searching and I've found one picture. How do I know that the two files are the same, with the exception that the one is encrypted? Well, the name is the same (except the extension .crypz and a difference in size of 6 KB. Is there anybody that can help me find the decryption key from these two files?

 

Thanks in advance,

Alex



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#2 quietman7

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Posted 03 January 2017 - 12:43 PM

Hello Alex and welcome to Bleeping Computer.

There are several different variants of CryptXXX Ransomware with different file extensions appended to the end of encrypted filenames.

Any files that are encrypted with earlier versions of CryptXXX Ransomware will have the .crypt extension appended to the end of the encrypted data filename. CryptXXX 2.x encrypted files are 260 bytes larger than the original files.

Any files that are encrypted with CryptXXX 3.x will have the .cryp1, .crypz or a random 5 hexadecimal character extension (i.e. .ACoD4, .DA3D1, .73E61, .EF538) appended to the end of the encrypted data filename as explained here. The Microsoft Decryptor variant of CryptXXX 3.x does not append an obvious extension to the end of encrypted filenames.

 

Any files that are encrypted with CryptXXX 4.x/5.x will have a <32 hexadecimal characters>(MD5 Hash).<random 5 hexadecimal characters> pattern (i.e. 0412C29576C708CF0155E8DE242169B1.6B3FE) appended to the end of the encrypted data filename.

The original CryptXXX will leave files (ransom notes) named de_crypt_readme.txt, de_crypt_readme.html, de_crypt_readme.bmp, de_crypt_readme.png. CryptXXX 2.x/3.x variants will leave unique Personal ID files using random 12 hexadecimal characters named ![victim_id].html, ![victim_id].txt, [victim_id].html, [victim_id].txt, [victim_id].bmp, @[victim_id].txt, @[victim_id].bmp, @[victim_id].html (i.e. S45CC72F3463.txt, !4AD604B8AE89.txt), !Recovery_[victim_id].html, !Recovery_[victim_id].txt, !Recovery_[victim_id].bmp (i.e. !Recovery_4582C8FAEB15.txt). Newer versions of CryptXXX will have generic ransom notes named !README.HTML, !README.BMP, README.HTML, README.TXT...see Post #1115)

Kaspersky Lab released a free decryptor tool for victims of CryptXXX v1, v2 and v3 (.crypt, .cryp1, crypz files)

Trend Micro released a Ransomware File Decryptor 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 and Trend Micro's tools cannot decrypt CryptXXX 4.x/5.x which uses a random <32 hexadecimal characters>.<5 hexadecimal characters> 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.

Thanks
The BC Staff


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