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cryptolocker

Posted on 2013-11-22
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Last Modified: 2013-11-29
I have a user that got infected, he ran Malwarebytes and removed
Now he cannot open any of his Word or Excel files, he can open other Word and Excel files other than the ones that were on his computer prior to infection

any suggestions?
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Question by:jsarinana
10 Comments
 
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by:
akb earned 250 total points
ID: 39670423
I had a customer with a similar problem a while ago. Turned out the virus had set all the files to Read-Only.
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Expert Comment

by:Giovanni Heward
ID: 39670463
While the malware is removed the files will remain encrypted.  For an explanation of this read http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/Q_28275170.html#a39606853

If you don't have a backup, try using shadow explorer, if that fails the only method available to recover your files is the decryption key, which unfortunately is only available from the malware author and requires the ransom to be paid.

To pay the ransom and recovery your files, read http://www.experts-exchange.com/Security/Vulnerabilities/Q_28294767.html#a39651228

Preventative solutions are posted @ http://www.experts-exchange.com/Storage/Misc/Q_28296724.html#a39657671
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Assisted Solution

by:Biniek
Biniek earned 250 total points
ID: 39670470
I do not have good news for You,

CryptLocker has encrypted all user files with private/public key, so the files are encrypted,

You can look at :

http://www.experts-exchange.com/Security/Digital_Forensics/Q_28261996.html
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Expert Comment

by:aadih
ID: 39670497
< Preventative solutions >:

Also: Bitdefender Anti-CryptoLocker.
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Expert Comment

by:Giovanni Heward
ID: 39670519
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Author Comment

by:jsarinana
ID: 39675226
The virus this user was infected with was called
Ransom-FFD!1BD961039177

ANY SUGGESTIONS?
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Expert Comment

by:Giovanni Heward
ID: 39675247
Please upload a sample encrypted file and we'll see if we can confirm.  Thanks.
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Author Comment

by:jsarinana
ID: 39675502
Thanks x66_x72_x65_x65
here is a zip file with three bad files Word and Excel
bad-files.zip
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LVL 14

Expert Comment

by:Giovanni Heward
ID: 39675804
All files reflect the CryptoLocker file header signature (scanner and signature reference posted previously.)

CryptoUnLocker.exe --detect s.xls
[+] Found a potential CryptoLocker file: s.xls

CryptoUnLocker.exe --detect "Zacky Farms PE ETEC.doc"
[+] Found a potential CryptoLocker file: Zacky Farms PE ETEC.doc

CryptoUnLocker.exe --detect "Zacky PE Q.doc"
[+] Found a potential CryptoLocker file: Zacky PE Q.doc
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Author Closing Comment

by:jsarinana
ID: 39686024
thanks
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