All .doc/,pdf/,xls files changed to .exe

I'm having an issue that started today on a Windows Server 2003 machine. It appears that one particular folder, the shared documents folder, is systematically having all the files changed to .exe extensions. I've run Vipre virus scans as well as Malwarebytes are removed a few things, but no smoking gun.

Can anyone lead me down the path of how to get the file extensions correct again so that the files can be opened? The latest backup appears to have copied the .exe files and I don't think this client has multiple versions of their backups.

Any help is greatly appreciated!!
PcdynamixAsked:
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Immediately prevent all users from being able to write into that folder. Looks like Ransomware encrypts files. That software can run on any client, so difficult to find unless you have file auditing enabled.
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PcdynamixAuthor Commented:
Should i make the folder read only for now?
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NVITCommented:
> Should i make the folder read only for now?
ASAP.

I hope you have a backup.

If that folder is used as a file server share, make an alternate share until this is resolved.
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PcdynamixAuthor Commented:
The other thing I just noticed is that the drive now only has 1.26MB free of 200GB. Is it making a copy of the original files somewhere?
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Don't "set" the read-only attribute of a folder - it is of absolutely no use. Add a deny for writes for all users but an admin on the file system, or change the share's permission to read-only.
That there is no free space anymore is probably saving you from having more files changed!
Ransomware does not create backups, as that would be counterproductive for its purpose ;-).

For getting an idea of where space is used most, you can use some 3rd party tools like TreeSize Free. Doing that manually is cumbersome.
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PcdynamixAuthor Commented:
It doesn't appear there is a recent backup. What other options are their? Data recovery firms?
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NVITCommented:
Seems so. Looks like you'll need to do some investigating.

Also, if this virus replicates via mapped drives, you should probably disable the maps. Then check the folders of the mapped drives. They may be affected.
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NVITCommented:
If no backups... I think you're out of luck
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NVITCommented:
> ...Vipre virus scans as well as Malwarebytes are removed a few things...
What do the logs say it removed?
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Did you run Vipre and MBAM on a client or the file server?
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PcdynamixAuthor Commented:
File server and one of the client machines
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Windows Server 2003

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