User id getting deleted from AD frequently.

Hello, we are facing issue with Active Directory that multiple accounts are getting deleted from AD and we need to find out how and why these accounts are getting deleted.

We also have only 300 MB limit for Event logs and this issue occurred at 09/20.

Please help us to find out root cause of this deletion as we don't have logs so unable to trace issue via event logs.
We have 2003 AD servers present where this issue occurred.

Also we suspect that this is done via some script as more then 5 AD accounts deleted at same point of time (09/20 @ 08:44:46 AM) which manually is not possible.
biplabmukhAsked:
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Mike KlineCommented:
Without logs you will not be able to get the full picture.  Did this happen once or has it happened multiple times?  If it has happened multiple times I suggest log tuning or increasing your log size so that you have the logs.

Do you have auditing enabled for AD objects?

Thanks

Mike
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jmanishbabuCommented:
User and computer account deletion, you must keep the “Account Management” auditing enabled.

Check this Blog how to do that.

http://blogs.technet.com/b/abizerh/archive/2010/05/27/tracing-down-user-and-computer-account-deletion-in-active-directory.aspx
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biplabmukhAuthor Commented:
Thanks for reply however we do have auditing enabled on AD servers however log size is 300 MB set. Is there any tool or any other script can help to determine how accounts got deleted which do not require Event logs.
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jmanishbabuCommented:
1. Dump the deleted objects in “Deleted objects” container.

    - Ldifde –x –d “CN=Deleted Objects,DC=domain,DC=com” –f Deletedobj.ldf

2. Search the Deletedobj.ldf file for the AD object that got deleted. The name of this object would have a GUID appended to it. Copy the DN attribute value of this object.

Use this command .

Repadmin /Showmeta “DN of the deleted object” > Delshowmeta.txt

Eg:

Repadmin /Showmeta “CN=TestUser\0ADEL:aff006d7-7758-4b24-bb53-6e8f1a87834e,CN=Deleted Objects,DC=2008dom,DC=local” > Delshowmeta.txt

Check the below link it will explain how to use this and check

http://blogs.technet.com/b/abizerh/archive/2010/05/27/tracing-down-user-and-computer-account-deletion-in-active-directory.aspx
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la-tempestadCommented:
I think top of what jmanishbabu suggested,you can check any group policy is actually using for the deletion of objects from the live users folder than inactive users folder,any scheduled task running on any of your application servers or any SQL jobs set up for some maintenance jobs etc.

Regards
la
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SandeshdubeySenior Server EngineerCommented:
In order to find out changes, creation or deletion events, you must keep the “Account Management” auditing enabled.

Apart from the auditing, you can use third party tools like Quest and Ntewrix to find out WHO changed WHAT, WHEN, and WHERE to list additions, deletions, and modifications made to Active Directory users, groups, computers, OUs, group memberships.
 
NetWrix tool : http://www.netwrix.com/active_directory_change_reporting_freeware.html
 
Quest: http://www.quest.com/changeauditor-for-active-directory/

If auditing is not enabled, still you can find out changes were made on which DC and when using repadmin /showobjmeta
http://blogs.technet.com/b/ad/archive/2006/06/12/435501.aspx
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