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Infected with Win32/Filecoder.EM trojan an ER trojan


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#1 John Wood

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Posted 09 May 2015 - 08:32 AM

I've removed the virus (it's in ESET quarantine) but my files cannot be open. The following extensions are changes: pdf.exx, avi.exx, jpeg.exx, docx.exx, xls.exx (all my files are .exx). Please help me out to solve it.

 

Thanks,

 

Kind Regards,

 

John Wood

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#2 HelpBot

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Posted 14 May 2015 - 09:00 AM

Hello and welcome to Bleeping Computer!

I am HelpBot: an automated program designed to help the Bleeping Computer Staff better assist you! This message contains very important information, so please read through all of it before doing anything.

We apologize for the delay in responding to your request for help. Here at Bleeping Computer we get overwhelmed at times, and we are trying our best to keep up. Please note that your topic was not intentionally overlooked. Our mission is to help everyone in need, but sometimes it takes just a little longer to get to every request for help. No one is ignored here.

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#3 John Wood

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Posted 15 May 2015 - 04:29 PM

I've removed the virus (it's in ESET quarantine) but my files cannot be open. The following extensions are changes: pdf.exx, avi.exx, jpeg.exx, docx.exx, xls.exx (all my files are .exx). After follow HelpBot instruction, a new FRST.txt is attached. Looking forward for your help....

 

Thanks,

 

John Wood

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  • Attached File  FRST.txt   63.04KB   11 downloads


#4 The Pugilist

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Posted 24 May 2015 - 10:36 AM

Hello John,

 

my name is Dave and I'll be helping you out.  Please allow me some time to review the material you've provided.  IN the mean time, please refrain from making any additional changes the the computer.  Please use this machine as little as possible.  Making additional changes can lessen the chances for data recovery and make it difficult for me to assist you.

 

I'll post back here as soon as I have more for you.


//Dave

#5 The Pugilist

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Posted 26 May 2015 - 11:15 AM

John,

 

There are a few issues with your computer at the moment but the first one that I'd like to examine is your files.  Your computer was infected by a family of malware known as ransomware.  This software attempts to encrypt your files (and make them inaccessible to you) then subsequently ransom you for them. 

 

In your case, you appear to have been infected by TeslaCrypt.  As it so happens, there is a tool available to try to decrypt the files on your computer without paying any ransom.  This is what we will try to do first.

 

To decrypt, please follow these instructions.  If you have questions along the way, do not hesitate to ask!

  • Please download TeslaDecode and safe it to your desktop.
  • To extract all files or folders, right-click the compressed folder, and then click Extract All. In the Compressed (zipped) Folders Extraction Wizard, specify where you want to store the extracted files.
  • Double click into the folder you just created and double click TeslaDecoder.exe
  • On the right-hand side, click Decrypt All.

Once this finishes, let me know how it goes!  If all goes well, we'll move on to the rest of the cleanup.


//Dave

#6 John Wood

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Posted 27 May 2015 - 03:02 AM

Appreciate your help Dave. I'll follow your instructions today and let you know the results. 

 

John



#7 The Pugilist

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Posted 01 June 2015 - 12:29 PM

John,

 

It's been a couple days since our last interaction here, do you still require help?  If so, please post back to this thread (even if just to say that you need more time) or this thread will be closed in 48 hours.  Thanks!


//Dave

#8 John Wood

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Posted 02 June 2015 - 05:02 AM

Sorry for replaying so late but I've been busy with other issues. I've followed your instruction regarding TeslaDecode but unfortunately, the decrypt  key cannot be found was the message, among the file is to big for loading ( my computer has not being infected at all; I've stopped the virus propagation after maximum 10 minutes from starting). Some of the file  has been infected at all (extension being added as .exx and size changed from original to 800 KB) some of them just have only the extension changed and not the size. Overall I've been infected at 30% let say. Being afraid do not loose all the information's, I've upgrade to OS from XP to W7 Ultimate (might be the reason why TeslaDecode couldn't performed the job). I still want to recover the infected files.....

 

Appreciate your help......



#9 The Pugilist

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Posted 03 June 2015 - 04:30 PM

At this point, we obviously know that TestlaDecode didn't work, but to find out why we need some more information.  I would like you to generate a fresh FRST log (the same way as you did it before) and post back here.  If you have questions regarding that process, don't hesitate to ask!

 

Also, what method did you use to upgrade your computer's OS?  Did you back up your data, then wipe the computer and install the new OS?


//Dave

#10 John Wood

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Posted 04 June 2015 - 03:31 PM

Hi Dave,

 

Attached you can find the requested file plus "Addition" file as well. As a upgrade method, I've installed new OS over existing one, without wipe the computer, generating a file named "Windows.old".  If additional info's or new questions arise, please let me know. Thanks one more time for your help and effort to solve my issues.

 

John

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#11 The Pugilist

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Posted 06 June 2015 - 07:58 AM

Thanks for the updated log!  TeslaDecode did not work because the file needed to decrypt your data was either moved or deleted during the upgrade process.  What we will do now is run a search for that file to see if we can find it.

 

Here's how:

  • Please open up FRST (like you did when generating the log file).
  • Paste the following text into the search box:
    storage.bin
  • Click the Search File(s) button.
  • When this process finishes, a file called Search.txt will be created in the same directory as FRST.  Please attach this in this to your next reply.

//Dave

#12 John Wood

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Posted 08 June 2015 - 03:01 PM

Hi Dave. The file is attached. Seems that FRTS, have not found the storage.bin. Please not that I've not check any of the boxes under Optional scan. Let me know what are the further options.

 

Thanks,

 

John

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#13 The Pugilist

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Posted 09 June 2015 - 08:14 AM

Well, it appears as though the operating system upgrade may have deleted the file we are looking for.  Do you have any backups of the computer as it was before the upgrade?


//Dave

#14 The Pugilist

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Posted 12 June 2015 - 05:41 PM

Still in need of assistance?  If not, this thread will be closed in 48 hours.


//Dave

#15 John Wood

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Posted 14 June 2015 - 08:52 AM

Still need assistance Dave. No computer backup available. What we can do further?

 

John






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