Event Details
Operating System->Microsoft Windows->Built-in logs->Windows 2000-2003->Security Log->Account Management->EventID 639 - Security Enabled Local Group Changed [Win 2003]
EventID 639 - Security Enabled Local Group Changed [Win 2003]
Indicates that security local group was successfully changed by "caller" user.

Note: 
This event also shows group membership changes (additions and removals of a group member) for which there are other more explicit event IDs (636,637).

Find more information about this event on ultimatewindowssecurity.com.


Corresponding events on other OS versions:
Windows 2000 / XP

Windows 2008
 Sample:
        Event Type:     Success Audit
        Event Source:   Security
        Event Category: Account Management
        Event ID:       639
        Date:           10/26/2009
        Time:           07:31:56
        User:           RESEARCH\ALebovsky
        Computer:       DC1
        Description:
        Security Enabled Local Group Changed:
        Target Account Name:	Setup Operators
        Target Domain:	RESEARCH
        Target Account ID:	%{S-1-5-21-184992632-1607737289-1287950321-1179}
        Caller User Name:	Alebovsky
        Caller Domain:	RESEARCH
        Caller Logon ID:	(0x0,0x59DF36)
        Privileges:	-
        Changed Attributes:
        Sam Account Name:	-
        Sid History:	-
      
Log Type: Windows Event Log
 Uniquely Identified By:
Log Name: Security
Filtering Field Equals to Value
OSVersion Windows 2003
Category Account Management
Source Security
EventId 639
Field Matching
FieldDescriptionStored inSample Value
DateTime Date/Time of event origination in GMT format. DateTime 10.10.2000 19:00:00
Source Name of an Application or System Service originating the event. Source Security
Type Warning, Information, Error, Success, Failure, etc. Type Success
User Domain\Account name of user/service/computer initiating event. User RESEARCH\Alebovsky
Computer Name of server workstation where event was logged. Computer DC1
EventID Numerical ID of event. Unique within one Event Source. EventId 576
Description The entire unparsed event message. Description Special privileges assigned to new logon.
Log Name The name of the event log (e.g. Application, Security, System, etc.) LogName Security
Category A name for a subclass of events within the same Event Source. Category Logon/Logoff
Caller User Name Account initiating action InsertionString4 Alebovsky
Caller Domain Domain of the account initiating action InsertionString5 RESEARCH
Caller Logon ID A number uniquely identifying the logon session of the user initiating action. This number can be used to correlate all user actions within one logon session. InsertionString6 (0x0,0x59DF36)
Target Account Name Name of the account on which the action is performed InsertionString1 Setup Operators
Target Domain Domain name of the Target Account InsertionString2 RESEARCH
Target Account ID Target Account Name in the following format: Target Domain\Target Account Name InsertionString3 %{S-1-5-21-184992632-1607737289-1287950321-1179}
Privileges Contains the list of privileges. The purpose of this field is unknown. In most cases it is empty. InsertionString7 -
Sam Account Name The logon name used to support clients and servers running older versions of the operating system, such as Windows NT 4.0, Windows 95, Windows 98, and LAN Manager. InsertionString8 -
Sid History Contains previous SIDs used for the object if the object was moved from another domain. InsertionString9 -
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