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Can a cryptowall virus pass from an infected PC to an external device?

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#1 DukeBob


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Posted 23 December 2015 - 07:37 PM

I got hit by a cryptowall.


The computer hit by the cryptowall was my gaming PC so there was no data files to lose. What I want to know is the next thing: can the cryptowall virus move from the PC to external drives which had been connected to the infected PC? Or it merely encrypts all data files on any drive connected to the infected PC and that's it?

Basically, I want to know whether (and how) it can spread. Once I noticed I was hit by a cryptowall, I removed immediately any external device from the infected PC and installed a clean Windows + I have formatted all the other non-system drives (the PC had three internal drives)? Is that enough? I had an external HDD connected to it when the infection occurred; if any files on it got encrypted is irrelevant, but could the virus have moved on it as well or does it stay on the operating system it infected at the onset? The external HDDs had rar, iso and png files on it.


I couldn't care less about their ransom. What I want is to avoid spreading it to other systems and external device by ignorance, as I am not very familiar with how Cryptowall works.


Edited: After some reading through the forums, it seems the virus was Teslacrypt version 8, as the encrypted files had the .vvv extension. That should make the answers to my questions easier.

Feel free to move this post to the appropriate thread (I started a new thread because I did not know exactly what kind of ransomware it was).

Edited by DukeBob, 23 December 2015 - 07:51 PM.

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#2 quietman7


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Posted 23 December 2015 - 08:16 PM

You are dealing with a newer variant of TeslaCrypt (Alpha Crypt). TeslaCrypt (Alpha Crypt) includes several known versions with various extensions for encrypted files to include: .ecc, .ezz, .exx, .xyz, .zzz, .aaa, .abc, .ccc, .vvv, as described described here.

A repository of all current knowledge regarding CryptoWall, CryptoWall 2.0, CryptoWall 3.0 & CryptoWall 4.0 is provided by Grinler (aka Lawrence Abrams), in this topic: CryptoWall and DECRYPT_INSTRUCTION Ransomware Information Guide and FAQ

A user is typically infected by TeslaCrypt or Alpha Crypt when they visit a hacked web site running an exploit kit and have outdated programs on their computer. In order to distribute their malware, developers will hack web sites and install a special software called an exploit kit that attempts to exploit vulnerabilities found in programs on your computer. The programs that are typically exploited include Java, Adobe Flash, Acrobat Reader, and Windows vulnerabilities. When an exploit kit successfully exploits your computer, it will install and start the ransomware without your knowledge

TeslaCrypt and Alpha Crypt will scan all drive letters on your computer including removable drives, network shares, and even DropBox mappings. In summary, if there is a drive letter on your computer it will be scanned for data files to encrypt by the ransomware

There is an ongoing discussion in this topic where you can ask questions and seek further assistance.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. 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.

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