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TeslaCrypt 3 infection with .micro encrypted files


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#1 SEBB

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Posted 27 January 2016 - 05:09 PM

Hi, new here but a friend has asked me for help with their laptop that has been infected with TeslaCrypt 3.

 

When they realised that they were infected they shut the computer down but by this time most of their files had been encrypted and replaced by ones of the same names but with the .micro extension.  They haven't yet been prompted with a window asking for payment to unlock, but the payment instructions appear in every directory that has encrypted files.  A recovery_filexxx.txt is present in their profile directory but there is no key.dat anywhere on the hard disk.

 

Annoying at the time this happened they had their external back up drive connected so that too is stuffed.

 

I have booted the computer off a live CD to check the state of the hard disk and I am attempting to recover any deleted files before I remove the infection and boot into Windows to go after any shadow copies.

 

I understand that this is a very new variant but has any progress been made on decrypting the files, and if not is there anything I can pull from the disk before I clean the infection and boot back into Windows that would be of use in breaking the encryption?

 

Thank you

SE-BB



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#2 quietman7

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Posted 27 January 2016 - 07:41 PM

Any files that are encrypted with TeslaCrypt 3.0 will have the .xxx, .ttt or .micro extension appended to the end of the filename as described in this news article and leave .html, .txt files (ransom notes) with names like recovery_file_[random].txt, recover_file_[random].txt, and Howto_Restore_FILES.TXT.

 

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.

There currently is no way of decrypting TeslaCrypt 3.0 .xxx, .ttt, or .micro variants since they use a different protection/key exchange algorithm and the key for them cannot be recovered. The .xxx, .ttt and .micro variants are not supported by the current released version of TeslaViewer. If infected with any of these, backup all your encrypted files, send BloodDolly a private message with a link to few encrypted files after uploading them to SendSpace (see instructions in Post #1) and wait for solution.

There is an ongoing discussion in this topic where you can ask questions and seek further assistance.

You can also post comments in the related BC News article:

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, particularly the last if dealing with one of the newer variants. 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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