A workstation in my workgroup has been hit with Cryptowall.

A workstation in my workgroup has been hit with Cryptowall, Files are encrypted and demanding ransom. I know that it is a lost cause. Format and reinstall scheduled, but  the workstation has several mapped drives as do all of the workstations. How can I tell if the Crypto has spread to any other workstations or server and might be encrypting in the background or does it work that way?
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DeepinInfrastructure Engineer Commented:
look for help_decrypt.html ,help_decrypt.txt and help_decrypt.png on the drives
Joe Winograd, Fellow&MVEDeveloperCommented:
I suggest reading Tom's excellent EE article on the subject:
Ransomware: Prevention is the only solution

In your case, note especially section B. NETWORK SHARES. Good luck! Regards, Joe
The virus doesn't spread to other PC's, but files on your server could have been encrypted. Just look for unusual extensions, and if there are any such files, delete them and restore the originals from your backups.

Additionally take measures so that future infections get less likely. Educate your users on safe email and web use. Make sure no one ever logs on to PC's with an account that has administrative rights.
Cryptowall keeps a list of files it affects in the registry.  There is a utility called ListCwall found at the following URL: http://www.bleepingcomputer.com/download/listcwall/

The link is towards the bottom of the page to download.  Basically boot the system with network disconnected.  Log in with the User(s) id that was affected and fun the utility.  This will hive you an exact list of what files and folderz were affecfed and you can then determine if any files on the mapped deivers were hit.

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Correction on my last comment.  The link is actually to the download page for the utility.  The artice about it that has the link is here: http://www.bleepingcomputer.com/virus-removal/cryptowall-ransomware-information
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