Cryptowall Ransomware

We have a QNAP TS-259 Pro Plus Ver 4.1.4 (2015/09/10) It has two 1.8TB disks in RAID 1 Mirror configured as a single simple volume. In the last few days it seems that one of the PC's in the office which has a drive mapped to this NAS has been infected with some sort of Ransomeware, we have a complete directory and it's subfolders some 600MB which seems to have a load of files missing and in their place we have these HELP_DECRYPT files and one being a text file with the following info inside it:

What happened to your files ?
All of your files were protected by a strong encryption with RSA-2048 using CryptoWall 3.0.
More information about the encryption keys using RSA-2048 can be found here: http://en.wikipedia.org/wiki/RSA_(cryptosystem)


What does this mean ?
This means that the structure and data within your files have been irrevocably changed, you will not be able to work with them, read them or see them,
it is the same thing as losing them forever, but with our help, you can restore them.


How did this happen ?
Especially for you, on our server was generated the secret key pair RSA-2048 - public and private.
All your files were encrypted with the public key, which has been transferred to your computer via the Internet.
Decrypting of your files is only possible with the help of the private key and decrypt program, which is on our secret server.


What do I do ?
Alas, if you do not take the necessary measures for the specified time then the conditions for obtaining the private key will be changed.
If you really value your data, then we suggest you do not waste valuable time searching for other solutions because they do not exist.


For more specific instructions, please visit your personal home page, there are a few different addresses pointing to your page below:
1.http://ayh2m57ruxjtwyd5.blindpayallfor.com/tt2eis
2.http://ayh2m57ruxjtwyd5.stopmigrationss.com/tt2eis
3.http://ayh2m57ruxjtwyd5.starswarsspecs.com/tt2eis
4.http://ayh2m57ruxjtwyd5.malerstoniska.com/tt2eis

If for some reasons the addresses are not available, follow these steps:
1.Download and install tor-browser: http://www.torproject.org/projects/torbrowser.html.en 
2.After a successful installation, run the browser and wait for initialization.
3.Type in the address bar: ayh2m57ruxjtwyd5.onion/tt2eis
4.Follow the instructions on the site.


IMPORTANT INFORMATION:
Your personal page: http://ayh2m57ruxjtwyd5.blindpayallfor.com/tt2eis
Your personal page (using TOR): ayh2m57ruxjtwyd5.onion/tt2eis
Your personal identification number (if you open the site (or TOR 's) directly): tt2eis


Am I screwed? We have a backup which runs to a USB drive every night but that's got the same files on it, as far as I know this type of NAS doesn't do versioning unless I'm missing something? I do however have the network recycle bin switched on and it seems there's a lot of stuff in there which could be the original files perhaps (I am not a user of the files so I really don't know what is supposed to be in there, I can of course check with the users).

So I believe this is some form of CryptoWall malware/virus and the only option is to cough up or restore from backup assuming of course your backups are solid and versioned, which mine ain't... anyone had any success in paying the ransom on these things?
markflexmanAsked:
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rindiCommented:
First you will have to find the infected PC, and remove it from the LAN. Then Id get in touch with the authorities so they can take a look at that PC. It might help them find the crooks in the long run, or get leads so their networks can be shutdown.

After that delete the documents that got encrypted and restore them from your backups. Never, ever pay any ransom!

You may have to think about a different backup concept in the future. Backup to multiple USB disks, which you rotate.

Make sure the PC's have a good AV tool installed, and the users don't have any Admin rights. Also teach the users how to use the internet, only visit trusted sites, never open email attachments unless you expect them, etc, basically all the common sense basics... Most Ransom-ware is received via attachments.

After the infected PC has been given free by the authorities, do a clean install on it.
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RantCanSr. Systems AdministratorCommented:
That is all excellent advice; I doubt the authorities will care, however.

Here is a link to setting up some solid, end-user-centric infosec awareness training.

http://www.slideshare.net/frostinel/end-user-security-awareness-presentation-presentation
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markflexmanAuthor Commented:
I've requested that this question be deleted for the following reason:

nobody provided a useful answer
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rindiCommented:
My answer is useful, even if you didn't want to hear it.
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RantCanSr. Systems AdministratorCommented:
I recommend answer points be split amongst the three experts, each of whom suggested different ways to help.

Comment from @rindi http:#a41089766 was a practical overview in steps for sterilizing the affected node and prevention.

Comment from @rantcan http:#a41091444 offered a link to guide for setting up Security Awareness Training for users, which can be daunting for a novice.

Comment from @tzucker http:#a41091924 gave two links to excellent articles he wrote detailing the ins and outs of ransomware and means to mitigate.

The experts gave sufficient resources to help the asker enhance their security posture from here on out.
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