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Crowti.A - CryptoDefense


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#1 nicojelek

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Posted 04 May 2015 - 05:54 PM

Hi, i have a PC that 90% of my photo (.jpg) and most of .docx .doc, etc files can't be opened. it says the file is crypted and i sugested to pay some $. 

and there is a HELP_DECRYPT.html on my desktop. i scan that file on virustotal.com and only 1 antivirus (Microsoft) found a Ransom:HTML/Crowti.A.  Avira free antivirus & windows defender found nothing when i tried to scan the HELP_DECRYPT.html. 

i'm also tried to scan a .jpg and .docx that corupted. but those file are clean. i copy those file to different computer but still can't be opened. 

 

 

i delete the HELP_DECRYPT.html (i know this will not completely remove the virus) . and now im trying to find something that can save my data. then i find about CryptoDefense and exactly is my problem.

 

please and thx for your assistance.. 



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#2 quietman7

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Posted 04 May 2015 - 07:29 PM

Crowti is generic name and results in CryptoWall 90% of the time. As such, it brands itself as CryptoWall or CryptoDefense when it informs victims their data has been encrypted. Like CryptoWall, Crowti directs its victims to a Tor page and gives them instructions on how to purchase Bitcoin to unlock their information.

Similar to CryptoWall, a fairly recent Cryptolocker variant, Crowti uses a valid digital signature to appear legitimate and then, once installed, demands users pay in Bitcoin to purportedly decrypt their files.


- CryptoWall 3.0 leaves files (ransom notes) named:
HELP_DECRYPT.TXT
HELP_DECRYPT.HTML
HELP_DECRYPT.URL
HELP_DECRYPT.PNG

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

Reading that Guide will help you understand what CryptoWall (including versions 2.0 & 3.0) does and provide information for how to deal with it. Cryptowall typically deletes (though not always) all Shadow Volume Copies with vssadmin.exe so that you cannot restore your files via System Restore or using a program like Shadow Explorer...but it never hurts to try. At this time there is no fix tool and Decryption of any CryptoWall Files...is impossible since there is no way to retrieve the private key that can be used to decrypt your files without paying the ransom.

There are also lengthy ongoing discussion 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 that topic discussion. To avoid unnecessary confusion...this topic is closed.

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