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Ransom Trojan Help


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#1 ms394

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Posted 06 November 2014 - 05:21 PM

Hello,

I am seeking guidance in permanently removing this Trojan ransomware I have acquired. 

I have sought the help of a professional  IT company, who ran antimalware programs (TDSS, HitmanPro, Malwarebytes, Adwcleaner) and told me that I appeared clean when my computer was returned to me. (I have already lost all of my personal files, I did not try to decrypt them, I accepted the loss and deleted all my encrypted personal files)

However, Microsoft Security Essentials keeps detecting Malware, specifically

Ransom:Win32/Crowti

PWS:Win32/Zbot.gen!plock

VirTool:Win32/CeeInject.gen!KK

Trojan:JS/Loop.gen

 

Microsoft Security Essentials tells me that a problem is detected, cleaned, and removed. Yet, these problems continue to reoccur, continue to have to be cleaned and removed, so I know that my computer is not clean. 

 

The symptoms of this infection include my computer running very slow, occasionally freezing, and a powershell error message. 

 

Please help. Your assistance is much appreciated. 



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#2 quietman7

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Posted 06 November 2014 - 05:42 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.


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

Reading that Guide will help you understand what CryptoWall & CryptoWall 2.0 does and provide information for how to deal with it and possibly decrypt/recover your files. At this time there is no fix tool for CryptoWall.

CryptoWall 2.0 uses its own TOR gateways...see Updated CryptoWall 2.0 ransomware released that makes it harder to recover files.

There is also a lengthy ongoing discussion in this topic: CryptoWall - new variant of CryptoDefense.

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.

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The BC Staff
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