20 pts.
 Deleted AD user accounts reappearing
We delete user accounts, but after a while they come back. We have not restored a domain controller; where are these coming back from?

Software/Hardware used:
Windows 2008 R2
ASKED: December 6, 2012  8:05 PM

Answer Wiki:
Well exactly not confirmed but You can perform auditing to determine who may be creating accounts. 
There is a policy setting called "audit account management" that you can enable.
The description of the setting is below.

Audit account management
Computer ConfigurationWindows SettingsSecurity SettingsLocal
PoliciesAudit Policy

Description
Determines whether to audit each event of account management on a computer.
Examples of account managment events include:

a.. A user account or group is created, changed, or deleted
b.. A user account is renamed, disabled, or enabled
c.. A password is set or changed
By default, this value is set to No auditing in the Default Domain
Controller Group Policy object (GPO) and in the local policies of
workstations and servers.

If you define this policy setting, you can specify whether to audit
successes, audit failures, or not to audit the event type at all. Success
audits generate an audit entry when any account management event is
successful. Failure audits generate an audit entry when any account
management event fails. You can select No auditing by defining the policy
setting and unchecking Success and Failure.
Last Wiki Answer Submitted:  December 24, 2012  12:23 pm  by  palicos   100 pts.
All Answer Wiki Contributors:  palicos   100 pts. , TomLiotta   107,695 pts. , retertrtyry   15 pts. , Michael Tidmarsh   11,380 pts.
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How is your domain structure single domain controller or multiples domain controller. so possibly someone also receive same request for Windows ID creation please check the object creation date / time that will give you better idea about it.

 40 pts.