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pyth0n1c
82 lines
3.5 KiB
YAML
82 lines
3.5 KiB
YAML
name: Windows AD Suspicious Attribute Modification
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id: 5682052e-ce55-4f9f-8d28-59191420b7e0
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version: 1
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date: '2023-11-13'
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author: Dean Luxton
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status: production
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type: TTP
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data_source:
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- Windows Security 5136
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description: 'This detection monitors changes to the following Active Directory attributes:
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"msDS-AllowedToDelegateTo", "msDS-AllowedToActOnBehalfOfOtherIdentity", "msDS-KeyCredentialLink",
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"scriptPath", and "msTSInitialProgram". Modifications to these attributes can indicate
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potential malicious activity or privilege escalation attempts. Immediate investigation
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is recommended upon alert.'
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search: '`wineventlog_security` EventCode=5136 AttributeLDAPDisplayName IN ("msDS-AllowedToDelegateTo","msDS-AllowedToActOnBehalfOfOtherIdentity","scriptPath","msTSInitialProgram")
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OperationType=%%14674 ```Changes to the attribute "msDS-KeyCredentialLink" are
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also worth moniroting, however tuning will need to be applied``` | table _time ObjectClass
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ObjectDN OpCorrelationID src_user SubjectLogonId DSName AttributeValue AttributeLDAPDisplayName |
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rename SubjectLogonId as TargetLogonId, src_user as initiator, _time as eventTime |
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appendpipe [| map search="search `wineventlog_security` EventCode=4624 TargetLogonId=$TargetLogonId$"] |
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stats min(eventTime) as _time values(initiator) as src_user, values(DSName) as targetDomain,
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values(ObjectDN) as ObjectDN, values(ObjectClass) as ObjectClass, values(src_category)
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as src_category, values(src_ip) as src_ip values(LogonType) as LogonType values(AttributeValue)
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as AttributeValue values(AttributeLDAPDisplayName) as AttributeLDAPDisplayName by
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TargetLogonId | rex field=ObjectDN "^CN=(?P<cn>.*?),[A-Z]{2}\=" | eval dest=if(ObjectClass="computer",cn,null),
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user=if(ObjectClass="user",cn,null) | fields - cn | `windows_ad_suspicious_attribute_modification_filter`'
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how_to_implement: Ensure you are ingesting Active Directory audit logs - specifically
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event 5136. See lantern article in references for further on how to onboard AD audit
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data. Ensure the wineventlog_security macro is configured with the correct indexes.
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known_false_positives: If key credentials are regularly assigned to users, these events
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will need to be tuned out.
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references:
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- https://trustedsec.com/blog/a-hitchhackers-guide-to-dacl-based-detections-part-1-a
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- https://lantern.splunk.com/Security/Product_Tips/Enterprise_Security/Enabling_an_audit_trail_from_Active_Directory
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drilldown_searches:
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- name: View the detection results for $src_user$ and $dest$
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search: '%original_detection_search% | search src_user = $src_user$ dest = $dest$'
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tags:
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analytic_story:
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- Sneaky Active Directory Persistence Tricks
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asset_type: Endpoint
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confidence: 100
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impact: 100
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message: $src_user$ has added $AttributeLDAPDisplayName$ ACL rights to $ObjectClass$
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$ObjectDN$
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mitre_attack_id:
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- T1550
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- T1222
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- T1222.001
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observable:
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- name: src_user
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type: User
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role:
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- Victim
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- name: dest
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type: Hostname
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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risk_score: 100
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required_fields:
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- _time
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- OperationType
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- ObjectDN
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- OpCorrelationID
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- src_user
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- AttributeLDAPDisplayName
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- AttributeValue
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- ObjectClass
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- SubjectLogonId
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- DSName
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1222.001/dacl_abuse/suspicious_acl_modification-windows-security-xml.log
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source: XmlWinEventLog:Security
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sourcetype: xmlwineventlog
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