5137(S): A directory service object was created.
Subcategory: Audit Directory Service Changes
Event Description:
This event generates every time an Active Directory object is created.
This event only generates if the parent object has a particular entry in its SACL: the “Create” action, auditing for specific classes or objects. An example is the “Create Computer objects” action auditing for the organizational unit.
Note For recommendations, see Security Monitoring Recommendations for this event.
Event XML:
- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
<EventID>5137</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>14081</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2015-08-28T18:36:26.048167500Z" />
<EventRecordID>410737</EventRecordID>
<Correlation />
<Execution ProcessID="516" ThreadID="3156" />
<Channel>Security</Channel>
<Computer>DC01.contoso.local</Computer>
<Security />
</System>
- <EventData>
<Data Name="OpCorrelationID">{4EAD68FF-7229-42A4-8C73-AAB57169858B}</Data>
<Data Name="AppCorrelationID">-</Data>
<Data Name="SubjectUserSid">S-1-5-21-3457937927-2839227994-823803824-1104</Data>
<Data Name="SubjectUserName">dadmin</Data>
<Data Name="SubjectDomainName">CONTOSO</Data>
<Data Name="SubjectLogonId">0x32004</Data>
<Data Name="DSName">contoso.local</Data>
<Data Name="DSType">%%14676</Data>
<Data Name="ObjectDN">cn=Win2000,CN=Users,DC=contoso,DC=local</Data>
<Data Name="ObjectGUID">{41D5F7AF-64A2-4985-9A4B-70DAAFC7CCE6}</Data>
<Data Name="ObjectClass">computer</Data>
</EventData>
</Event>
Required Server Roles: Active Directory domain controller.
Minimum OS Version: Windows Server 2008.
Event Versions: 0.
Field Descriptions:
Subject:
- Security ID [Type = SID]: SID of account that requested the “create object” operation. Event Viewer automatically tries to resolve SIDs and show the account name. If the SID can't be resolved, you'll see the source data in the event.
Note A security identifier (SID) is a unique value of variable length used to identify a trustee (security principal). Each account has a unique SID that is issued by an authority, such as an Active Directory domain controller, and stored in a security database. Each time a user logs on, the system retrieves the SID for that user from the database and places it in the access token for that user. The system uses the SID in the access token to identify the user in all subsequent interactions with Windows security. When a SID has been used as the unique identifier for a user or group, it cannot ever be used again to identify another user or group. For more information about SIDs, see Security identifiers.
Account Name [Type = UnicodeString]: the name of the account that requested the “create object” operation.
Account Domain [Type = UnicodeString]: subject’s domain or computer name. Formats vary, and include the following ones:
Domain NETBIOS name example: CONTOSO
Lowercase full domain name: contoso.local
Uppercase full domain name: CONTOSO.LOCAL
For some well-known security principals, such as LOCAL SERVICE or ANONYMOUS LOGON, the value of this field is “NT AUTHORITY”.
For local user accounts, this field will contain the name of the computer or device that this account belongs to, for example: “Win81”.
Logon ID [Type = HexInt64]: hexadecimal value that can help you correlate this event with recent events that might contain the same Logon ID, for example, “4624: An account was successfully logged on.”
Directory Service:
Name [Type = UnicodeString]: the name of an Active Directory domain, where new object is created.
Type [Type = UnicodeString]: has “Active Directory Domain Services” value for this event.
Object:
- DN [Type = UnicodeString]: distinguished name of the object that was created.
Note The LDAP API references an LDAP object by its distinguished name (DN). A DN is a sequence of relative distinguished names (RDN) connected by commas.
An RDN is an attribute with an associated value in the form attribute=value; . These are examples of RDNs attributes:
• DC - domainComponent
• CN - commonName
• OU - organizationalUnitName
• O - organizationName
GUID [Type = GUID]: each Active Directory object has globally unique identifier (GUID), which is a 128-bit value that is unique not only in the enterprise but also across the world. GUIDs are assigned to every object created by Active Directory. Each object's GUID is stored in its Object-GUID (objectGUID) property.
Active Directory uses GUIDs internally to identify objects. For example, the GUID is one of an object's properties that is published in the global catalog. Searching the global catalog for a User object's GUID will yield results if the user has an account somewhere in the enterprise. In fact, searching for any object by Object-GUID might be the most reliable way of finding the object you want to find. The values of other object properties can change, but the Object-GUID never changes. When an object is assigned a GUID, it keeps that value for life.
Event Viewer automatically resolves GUID field to real object.
To translate this GUID, use the following procedure:
Perform the following LDAP search using LDP.exe tool:
Base DN: CN=Schema,CN=Configuration,DC=XXX,DC=XXX
Filter: (&(objectClass=*)(objectGUID=GUID))
Perform the following operations with the GUID before using it in a search request:
We have this GUID to search for: a6b34ab5-551b-4626-b8ee-2b36b3ee6672
Take first three sections a6b34ab5-551b-4626.
For each of these three sections, you need to change (Invert) the order of bytes, like this b54ab3a6-1b55-2646
Add the last two sections without transformation: b54ab3a6-1b55-2646-b8ee-2b36b3ee6672
Delete: b54ab3a61b552646b8ee2b36b3ee6672
Divide bytes with backslashes: \b5\4a\b3\a6\1b\55\26\46\b8\ee\2b\36\b3\ee\66\72
Filter example: (&(objectClass=*)(objectGUID = \b5\4a\b3\a6\1b\55\26\46\b8\ee\2b\36\b3\ee\66\72))
Scope: Subtree
Attributes: objectGUID
Class [Type = UnicodeString]: class of the object that was created. Some of the common Active Directory object classes:
container – for containers.
user – for users.
group – for groups.
domainDNS – for domain object.
groupPolicyContainer – for group policy objects.
For all possible values of this field open Active Directory Schema snap-in (see how to enable this snap-in: https://technet.microsoft.com/library/Cc755885(v=WS.10).aspx) and navigate to Active Directory Schema\Classes. Or use this document: https://msdn.microsoft.com/library/cc221630.aspx
Operation:
- Correlation ID [Type = GUID]: multiple modifications are often executed as one operation via LDAP. This value allows you to correlate all the modification events that comprise the operation. Just look for other events from current subcategory with the same Correlation ID, for example “5136: A directory service object was modified.” and “5139: A directory service object was moved.”
Note GUID is an acronym for 'Globally Unique Identifier'. It is a 128-bit integer number used to identify resources, activities or instances.
- Application Correlation ID [Type = UnicodeString]: always has “-“ value. Not in use.
Security Monitoring Recommendations
For 5137(S): A directory service object was created.
Important For this event, also see Appendix A: Security monitoring recommendations for many audit events.
If you need to monitor creation of Active Directory objects with specific classes, monitor for Class field with specific class name. For example, we recommend that you monitor all new group policy objects creations: groupPolicyContainer class.
You must set correct auditing access lists (SACLs) for specific classes within Active Directory container to get 5137. There's no reason to audit all creation events for all types of Active Directory objects; find the most important locations (organizational units, folders, etc.) and monitor for creation of specific classes only (user, computer, group, etc.).