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Potential CryptoLocker infection


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5 replies to this topic

#1 JerseyITGuy76

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Posted 03 August 2015 - 12:50 PM

A client of mine gave me his PC to try to recover anything I could from. He explained that he had gotten what he thought was CryptoLocker on it & had missed the deadline for paying the ransom to decrypt his files. Most of what's on there is his & his family's pictures & home videos... you know, the easily replaceable stuff!!

 

I had come here, as I always do when I've got something like this that I've not seen firsthand before. I downloaded & ran ListCrilock, but it ran for literally half a second & found 0 encrypted files. If I pick a folder at random (in this case a folder of pictures), all of the files are filename.jpg.gdpmbtd. If I remove everything after the .jpg file extension, it tells me the file I'm trying to open can't be opened because it's either damaged or corrupted.

 

I'd like to try to recover something for this guy, but I'm not sure what, if anything, I can do at this point. Does this sound like what Cryptolocker does? If so, is there anything I can do?



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#2 Firehouse

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Posted 03 August 2015 - 12:54 PM

Files cannot be recovered unless person had a backup. Cryptoransomware usually destructs itself after encryption,so you can clean remnants with TFC.



#3 Sintharius

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Posted 03 August 2015 - 02:46 PM

Hello,

The real CryptoLocker has been dead for a long time. What your client had is probably one of the copycats.

Can you search in the machine for text files that are generated by the ransomware? The name and contents will help to identify the ransomware.

Depending on the machine's settings and the particular ransomware, you can try Shadow Explorer or data recovery software (i.e. Recuva). However there is no 100% guarantee that it will work.

#4 quietman7

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Posted 03 August 2015 - 09:06 PM

Are there any file extensions appended to your files...such as .ecc, .ezz, .exx, .zzz, .xyz, .aaa, .abc, .ccc, .CTBL, .CTB2, .crinf, .XTBL, .encrypted, .vault, .HA3, .toxcrypt or 6-7 length extension consisting of random characters?

Did you find any ransom note? These infections are created to alert victims that their data has been encrypted and demand a ransom payment. Check your documents folder for an image the malware typically uses for the background note. Check the C:\ProgramData (or C:\Documents and Settings\All Users\Application Data) for a randomly named .html, .txt, .png, .bmp, .url file.

These are some examples:
HELP_DECRYPT.TXT, HELP_YOUR_FILES.TXT, HELP_TO_DECRYPT_YOUR_FILES.txt, HELP_RESTORE_FILES.txt
HELP_TO_SAVE_FILES.txt, RECOVERY_KEY.txt, DecryptAllFiles.txt, DECRYPT_INSTRUCTION.TXT
HOW_TO_DECRYPT_FILES.txt, How_To_Recover_Files.txt, About_Files.txt, encryptor_raas_readme_liesmich.txt
About_Files.txt, DecryptAllFiles_<user name>.txt, ReadDecryptFilesHere.txt
RECOVERY_FILES.txt, DecryptAllFiles_*******.txt (where * are 6-7 random characters)
Recovery_File_*****.txt, restore_files_*****.txt (where * are random characters)
recover_file_*****.txt, HOWTO_RESTORE_FILES_*****.txt (where * are random characters)
howto_recover_file_*****.txt, _how_recover_*****.txt (where * are random characters)
Once you have identified which particular ransomware you are dealing with, I can direct you to the appropriate discussion topic for further assistance.
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#5 JerseyITGuy76

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Posted 04 August 2015 - 08:46 AM

Are there any file extensions appended to your files...such as .ecc, .ezz, .exx, .zzz, .xyz, .CTBL, .CTB2, .XTBL, .encrypted, .vault, .HA3, .toxcrypt or 6-7 length extension consisting of random characters?

Did you find any ransom note? These infections are created to alert victims that their data has been encrypted and demand a ransom payment. Check your documents folder for an image the malware typically uses for the background note. Check the C:\ProgramData (or C:\Documents and Settings\All Users\Application Data) for a random named .html, .txt, .png, .bmp, .url file.

These are some examples.
HELP_DECRYPT.TXT, HELP_DECRYPT.HTML, HELP_DECRYPT.URL, HELP_DECRYPT.PNG
HELP_TO_DECRYPT_YOUR_FILES.bmp, HELP_TO_DECRYPT_YOUR_FILES.txt, HELP_RESTORE_FILES.txt
HELP_TO_SAVE_FILES.txt, HELP_TO_SAVE_FILES.bmp, RECOVERY_KEY.txt
DECRYPT_INSTRUCTION.TXT, DECRYPT_INSTRUCTION.HTML, DECRYPT_INSTRUCTION.URL
About_Files, HOW_TO_DECRYPT_FILES.txt, encryptor_raas_readme_liesmich.txt

Once you have identified which particular ransomware you are dealing with, I can direct you to the appropriate discussion topic for further assistance.

I did find one... looks like it's CryptoWall 3.0? I've got a screenshot of the ransom note. How do I attach it here so you can see it?



#6 quietman7

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Posted 04 August 2015 - 10:32 AM

How do I post a screen shot?

A repository of all current knowledge regarding CryptoWall, CryptoWall 2.0 & CryptoWall 3.0 is provided by Grinler (aka Lawrence Abrams), in this topic: CryptoWall and DECRYPT_INSTRUCTION Ransomware Information Guide and FAQ

There are also ongoing discussions in these topics: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. 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.

Thanks
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