Event ID - 684

Event Id684
DescriptionSet ACLs of members in administrators groups:
Target Account Name: Cmayz
Target Domain: DC=ts,DC=tengo,DC=com
Target Account ID: DOMAIN\Cmayz
Caller User Name: TS69$
Caller Domain: DOMAIN
Caller Logon ID: (0x0,0x3E7)
Event InformationAccording to Microsoft:

"Set the security descriptor of members of administrative groups."
Every 60 minutes on a domain controller a background thread searches all members of administrative groups (such as domain, enterprise, and schema administrators) and applies a fixed security descriptor on them. This event is logged.
Reference LinksUser management events

Alternate Event ID in Vista and Windows Server 2008 is 4780.

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