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Identifying the version of TeslaCrypt / AlphaCrypt from a cold Forensic image


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#1 SignalOne

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Posted 01 December 2015 - 09:19 AM

Hi,

 

I have a cold forensic image of a computer that got infected with Ransomware.  

From what I can find with Google, this was probably   TeslaCrypt/AlphaCrypt.  
Encrypted files have extension .CCC and folders have the _how_recover_???.txt and .html files.

Problem is, after the PC got infected, the user installed malware removal programs that seem to have removed
the ransomware executable.

Is there a way to identify the TeslaCrypt version from files/registry entries on the hard drive when the executable is missing?

 - Signa1


Edited by SignalOne, 01 December 2015 - 09:30 AM.


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#2 quietman7

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Posted 01 December 2015 - 05:17 PM

TeslaCrypt includes several known versions and extension variants to include: .ecc, .ezz, .exx, .zzz, .xyz, .aaa, .abc, .ccc., .vvv...as described here.

Any files that are encrypted with the newer variant of TeslaCrypt will have the .exx, .xyz, .zzz, .aaa, .abc, .ccc or .vvv extension appended to the end of the filename. The .aaa/.abc/.ccc/.vvv variants leave .html, .txt, files (ransom notes) with names like RECOVERY_FILE_*****.txt, restore_files_*****.txt, recover_file_*****.txt, HOWTO_RESTORE_FILES_*****.txt, howto_recover_file_*****.txt, _how_recover_*****.txt (where * are random characters). Some of the new variants pretend to be CryptoWall 3.0.

A repository of all current knowledge regarding TeslaCrypt, Alpha Crypt and newer variants is provided by Grinler (aka Lawrence Abrams), in this topic: TeslaCrypt and Alpha Crypt Ransomware Information Guide and FAQ

Information about and support for decrypting files affected by Alpha Crypt & TeslaCrypt ransomware can be found in this topic:
TeslaDecoder released to decrypt .EXX, .EZZ, .ECC files encrypted by TeslaCrypt

There is an ongoing discussion in this topic 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 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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