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Description

AD Object Owner Updated. The owner provides Full control level privileges over the target AD Object. This event has significant impact alone and is also a precursor activity for hiding an AD object.

  • Type: TTP

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2023-11-13
  • Author: Dean Luxton
  • ID: 4af01f6b-d8d4-4f96-8635-758a01557130

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1484 Domain or Tenant Policy Modification Defense Evasion, Privilege Escalation
T1222 File and Directory Permissions Modification Defense Evasion
T1222.001 Windows File and Directory Permissions Modification Defense Evasion
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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 `wineventlog_security` EventCode=5136 
| stats min(_time) as _time values(eval(if(OperationType=="%%14675",AttributeValue,null))) as old_value values(eval(if(OperationType=="%%14674",AttributeValue,null))) as new_value values(OperationType) as OperationType by ObjectClass ObjectDN OpCorrelationID src_user SubjectLogonId DSName 
| rex field=old_value "O:(?P<old_owner>.*?)G:" 
| rex field=new_value "O:(?P<new_owner>.*?)G:" 
| where old_owner!=new_owner ``` optional SID resolution lookups 
| lookup identity_lookup_expanded objectSid as new_owner OUTPUT downLevelDomainName as new_owner_user 
| lookup admon_groups_def objectSid as new_owner OUTPUT cn as new_owner_group 
| lookup identity_lookup_expanded objectSid as old_owner OUTPUT downLevelDomainName as old_owner_user 
| lookup admon_groups_def objectSid as old_owner OUTPUT cn as old_owner_group ``` 
| lookup builtin_groups_lookup builtin_group_string  as new_owner_group OUTPUT builtin_group_name as new_owner_group_builtin_group 
| lookup builtin_groups_lookup builtin_group_string  as old_owner OUTPUT builtin_group_name as old_owner_group_builtin_group 
| eval user=coalesce(new_owner_user, new_owner_group, new_owner_group_builtin_group, new_owner), previousOwner=coalesce(old_owner_user, old_owner_group, old_owner_group_builtin_group, old_owner) 
| stats values(previousOwner) as previousOwner values(user) as user values(SubjectLogonId) as SubjectLogonId by _time ObjectClass ObjectDN src_user OpCorrelationID DSName 
| `windows_ad_object_owner_updated_filter`

Macros

The SPL above uses the following Macros:

:information_source: windows_ad_object_owner_updated_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Lookups

The SPL above uses the following Lookups:

Required fields

List of fields required to use this analytic.

  • _time
  • OperationType
  • ObjectDN
  • OpCorrelationID
  • src_user
  • AttributeLDAPDisplayName
  • AttributeValue
  • ObjectClass
  • SubjectLogonId
  • DSName

How To Implement

Ensure you are ingesting Active Directory audit logs - specifically event 5136. See lantern article in references for further on how to onboard AD audit data. Ensure the wineventlog_security macro is configured with the correct indexes and include lookups for SID resolution if evt_resolve_ad_obj is set to 0.

Known False Positives

Unknown

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
100.0 100 100 $src_user$ has made $user$ the owner of AD object $ObjectDN$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 1