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What to do with a computer infected with TeslaCrypt?


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#1 t-user

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Posted 02 November 2015 - 12:23 PM

I have come across a computer that is infected with the latest Teslacrypt? Not sure what version it is or what it is.

Most of what I read makes it sound like that anyway. It looked like XLS, TXT, JPG, PNG, DOC files all encrypted

with a .CCC extension. I've never seen one of these infections first hand, but have read much on BC. I told user to

disconnect immediately from internet and not to shut  computer off. I have not run any kind of cleaning tool hoping that

something might be resident in memory to try to save their files. Just asking for advice how to proceed

Thanks

 



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#2 lupin 3rd

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Posted 02 November 2015 - 01:42 PM

don't shut down the pc, go here

http://accessdata.com/product-download/digital-forensics/ftk-imager-version-3.4.2 and download ftk imager

see the istruction on page 40 - 41 of the following pdf

http://www.di.unisa.it/~ads/ads/Sicurezza_files/Tesina%20Live%20Forensics.pdf

 

after that, try to contact LAWRENCE ABRAMS to how to extract the private key

his profile is this http://www.bleepingcomputer.com/forums/u/3/grinler/

 

see here for more information

http://www.bleepingcomputer.com/news/security/latest-teslacrypt-ransomware-adds-the-ccc-extension-to-encrypted-files/

 

 

alternatively you can also use MoonSols Windows Memory Toolkit v1.4 – Free

download MoonSols Windows Memory Toolkit v1.4 – Free (simulation a shop but it's free)

make a dump of memory from cmd specifying the path of win32dd amd the attribute -r and -f with this last parameter that contain the path if file dump

see an example on page 35 of the pdf

you must only execute the first command with the local path of the user pc and choose Y if the comand is fine


Edited by lupin 3rd, 02 November 2015 - 01:49 PM.


#3 quietman7

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Posted 02 November 2015 - 07:22 PM

Any files that are encrypted with the newer variant of TeslaCrypt will have the .exx, .xyz, .zzz, .aaa, .abc or .ccc extension appended to the end of the filename. The .aaa/.abc/.ccc variant drops files (ransom notes) with names like Recovery_File_*****.html, Recovery_File_*****.txt, restore_files_*****.html, restore_files_*****.txt, HOWTO_RESTORE_FILES_*****.txt, HOWTO_RESTORE_FILES_*****.html, HOWTO_RESTORE_FILES_*****.bmp (where ***** are random characters) and pretends 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

Unfortunately there is no way to decrypt the newer TeslaCrypt variants (.xyz, .zzz, .aaa, .abc, .ccc) without Tesla's private key. These variants no longer store any data files on the local disk and information stored in the registry as binary data only contains public keys and each shared secret.

There is an ongoing discussion in this topic: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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