SYSVOL and NETLOGON affected by crypto virus

Posted on 2016-09-09
Last Modified: 2016-09-11
Hi all

We have a SBS 2011 server and somehow the SYSVOL folder was affected by a crypto virus.

This is a server at a charity and they have only just noitced 10 days after it happened.

Is there a way i can recreate the items in these folders?

Question by:David
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LVL 18

Expert Comment

ID: 41792314
Do you have a backup of the Server?

Author Comment

ID: 41792317
we use Mozy to backup and even though the backup set for active directory has been selected i cant see that it would backup the sysvol folder?

The server is running fine. and there are only about 6 hardly used group policies

Author Comment

ID: 41792320
sorry also the windows file replication service- sysvol is selected
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Author Comment

ID: 41792511
i have restored a backup now, but was wondering if there was another way.
LVL 18

Accepted Solution

awawada earned 500 total points
ID: 41792529
No, for Crypto virus & Co there is no other way.
LVL 17

Expert Comment

ID: 41792953
How is it possible that someone had write access to Sysvol? Someone needs to seriously audit that environment. Even scarier is the thought someone is running around using an account in domain admins as their day to day account...

Unfortunately though, backup is the only way unless a decryption tool has been released by the security community. There are quite a few of these available where they have been able to reverse engineer the cryto malware and engineer a decryption tool. You just need to see if your variant had such a too. But to me if a DC had been compromised in such a fashion I would be building a new environment from scratch and moving everyone over to it. You have no idea how badly the environment has been compromised.
LVL 18

Expert Comment

ID: 41793161
Thanks for the points and check with your Antivirus vendor if the Domain Controller is now clean.

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