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Merge pull request #2699 from splunk/remove_ba_powerview
remove BA detection
This commit is contained in:
Bhavin Patel
@@ -1,64 +0,0 @@
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name: Windows PowerView AD Access Control List Enumeration
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id: 2b301d6c-0527-4dbd-8d2d-5345bc4be0cf
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version: 1
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date: '2023-05-02'
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author: Mauricio Velazco, Splunk
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status: production
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type: TTP
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description: The following analytic leverages Event ID 4104 to identify the execution of the PowerView powershell commandlets `Get-ObjectAcl` or `Get-DomainObjectAcl`. This commandlets
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are used to enumerate Access Control List permissions given to Active Directory objects. In an active directory environment, an object is an entity that represents an available resource within
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the organizations network, such as domain controllers, users, groups, computers, shares, etc. Maintaining Active Directory permissions is complicated and hard to manage, especially in complex
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and large environments with multiple domains. Weak permissions may allow adversaries and red teamers to escalate their privileges in Active Directory. PowerView is a common tool leveraged
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by attackers to identify and exploit configuration weaknesses.
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data_source:
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- Powershell 4104
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search:
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selection1:
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process.cmd_line|re: 'get-objectacl'
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selection2:
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process.cmd_line|re: 'get-domainobjectacl'
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condition: selection1 or selection2
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how_to_implement: To successfully implement this analytic, you will need to enable
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PowerShell Script Block Logging on some or all endpoints. Additional setup here
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https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: Administrators may leverage PowerView for legitimate purposes, filter as needed.
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references:
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- https://attack.mitre.org/techniques/T1078/002/
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- https://medium.com/r3d-buck3t/enumerating-access-controls-in-active-directory-c06e2efa8b89
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- https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/abusing-active-directory-acls-aces
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- https://powersploit.readthedocs.io/en/latest/Recon/Get-DomainObjectAcl/
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tags:
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analytic_story:
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- Active Directory Privilege Escalation
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asset_type: Endpoint
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confidence: 50
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impact: 40
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message: PowerView AD acccess control list enumeration detected on $Computer$
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mitre_attack_id:
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- T1078.002
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- T1069
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observable:
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- name: Computer
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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 Behavioral Analytics
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required_fields:
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- _time
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- EventCode
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- ScriptBlockText
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- Opcode
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- Computer
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- UserID
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kill_chain_phases:
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- Exploitation
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risk_score: 20
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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/T1078.002/powerview_acl_enumeration/windows-powershell.log
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source: XmlWinEventLog
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sourcetype: XmlWinEventLog
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update_timestamp: true
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@@ -1,109 +0,0 @@
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name: Windows PowerView AD Access Control List Enumeration
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id: 2b301d6c-0527-4dbd-8d2d-5345bc4be0cf
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version: 1
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description: The following analytic leverages Event ID 4104 to identify the execution
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of the PowerView powershell commandlets `Get-ObjectAcl` or `Get-DomainObjectAcl`.
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This commandlets are used to enumerate Access Control List permissions given to
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Active Directory objects. In an active directory environment, an object is an entity
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that represents an available resource within the organizations network, such as
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domain controllers, users, groups, computers, shares, etc. Maintaining Active Directory
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permissions is complicated and hard to manage, especially in complex and large environments
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with multiple domains. Weak permissions may allow adversaries and red teamers to
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escalate their privileges in Active Directory. PowerView is a common tool leveraged
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by attackers to identify and exploit configuration weaknesses.
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search: ' | from read_ba_enriched_events() | eval timestamp = ucast(map_get(input_event,"time"),"long",
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null) | eval metadata = ucast(map_get(input_event, "metadata"),"map<string, any>",
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null) | eval metadata_uid = ucast(map_get(metadata, "uid"),"string", null) | eval
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device=ucast(map_get(input_event,"device"), "map<string, any>", null) | eval device_hostname=ucast(map_get(device,"hostname"),
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"string", null) | eval process=ucast(map_get(input_event,"process"), "map<string,
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any>", null) | eval process_file=ucast(map_get(process,"file"), "map<string, any>",
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null) | eval process_file_path=ucast(map_get(process_file,"path"), "string", null)
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| eval process_uid=ucast(map_get(process,"uid"), "string", null) | eval process_cmd_line=ucast(map_get(process,"cmd_line"),
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"string", null) | eval actor=ucast(map_get(input_event,"actor"), "map<string, any>",
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null) | eval actor_user=ucast(map_get(actor,"user"), "map<string, any>", null) |
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eval actor_user_uid=ucast(map_get(actor_user,"uid"), "string", null) | where match_regex(process_cmd_line,
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/(?i)get-objectacl/)=true OR match_regex(process_cmd_line, /(?i)get-domainobjectacl/)=true
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| eval body=create_map(
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"devices", [
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create_map(
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"hostname", device_hostname, "type_id", 0, "uuid", ucast(map_get(device,"uuid"), "string", null)
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)
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],
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"time", timestamp,
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"evidence", create_map("device.hostname", device_hostname, "process.file.path", process_file_path, "process.uid", process_uid, "process.cmd_line", process_cmd_line, "actor.user.uid", actor_user_uid),
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"message", concat("Windows PowerView AD Access Control List Enumeration has been triggered on ", device_hostname, " by ", "Unknown", "."),
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"users", [
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create_map(
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"name", "Unknown", "uid", ucast(map_get(actor_user,"uid"), "string", null)
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)
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],
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"activity_id", 1,
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"category_uid", 2,
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"class_uid", 102001,
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"risk_level_id", 1,
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"risk_score", 20,
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"severity_id", 0,
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"rule", create_map("name", "Windows PowerView AD Access Control List Enumeration", "uid", "2b301d6c-0527-4dbd-8d2d-5345bc4be0cf", "type", "Streaming"),
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"metadata", create_map("customer_uid", ucast(map_get(metadata,"customer_uid"), "string", null), "product", create_map("name", "Behavior Analytics", "vendor_name", "Splunk"), "version", "1.0.0-rc.2", "logged_time", time()),
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"type_uid", 10200101,
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"start_time", timestamp,
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"end_time", timestamp
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)
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| into write_ba_finding_events();'
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how_to_implement: To successfully implement this analytic, you will need to enable
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PowerShell Script Block Logging on some or all endpoints. Additional setup here
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https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: Administrators may leverage PowerView for legitimate purposes,
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filter as needed.
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references:
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- https://attack.mitre.org/techniques/T1078/002/
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- https://medium.com/r3d-buck3t/enumerating-access-controls-in-active-directory-c06e2efa8b89
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- https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/abusing-active-directory-acls-aces
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- https://powersploit.readthedocs.io/en/latest/Recon/Get-DomainObjectAcl/
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tags:
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required_fields:
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- device.hostname
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- process.file.path
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- process.uid
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- process.cmd_line
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- actor.user.uid
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risk_score: 20
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security_domain: endpoint
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risk_severity: low
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research_site_url: https://research.splunk.com/endpoint/2b301d6c-0527-4dbd-8d2d-5345bc4be0cf/
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event_schema: ocsf
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mappings:
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- ocsf: device.hostname
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cim: dest
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- ocsf: process.file.path
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cim: process_path
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- ocsf: process.uid
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cim: process_id
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- ocsf: process.cmd_line
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cim: process
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- ocsf: actor.user.uid
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cim: user_id
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annotations:
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analytic_story:
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- Active Directory Privilege Escalation
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cis20:
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- CIS 10
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kill_chain_phases:
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- Exploitation
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- Delivery
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- Installation
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mitre_attack_id:
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- T1078.002
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- T1069
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nist:
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- DE.CM
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test:
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name: Windows PowerView AD Access Control List Enumeration Unit Test
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tests:
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- name: Windows PowerView AD Access Control List Enumeration
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attack_data:
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- file_name: windows-powershell.log
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data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1078.002/powerview_acl_enumeration/windows-powershell.log
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source: XmlWinEventLog
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runtime: SPL-DSP
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-90
@@ -1,90 +0,0 @@
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name: Windows PowerView AD Access Control List Enumeration
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id: 2b301d6c-0527-4dbd-8d2d-5345bc4be0cf
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version: 1
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date: '2023-05-02'
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author: Mauricio Velazco, Splunk
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type: TTP
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status: production
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description: The following analytic leverages Event ID 4104 to identify the execution
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of the PowerView powershell commandlets `Get-ObjectAcl` or `Get-DomainObjectAcl`.
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This commandlets are used to enumerate Access Control List permissions given to
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Active Directory objects. In an active directory environment, an object is an entity
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that represents an available resource within the organizations network, such as
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domain controllers, users, groups, computers, shares, etc. Maintaining Active Directory
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permissions is complicated and hard to manage, especially in complex and large environments
|
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with multiple domains. Weak permissions may allow adversaries and red teamers to
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escalate their privileges in Active Directory. PowerView is a common tool leveraged
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by attackers to identify and exploit configuration weaknesses.
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data_source:
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- Powershell 4104
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search: ' | from read_ba_enriched_events() | eval timestamp = ucast(map_get(input_event,"time"),"long",
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null) | eval metadata = ucast(map_get(input_event, "metadata"),"map<string, any>",
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null) | eval metadata_uid = ucast(map_get(metadata, "uid"),"string", null) | eval
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device=ucast(map_get(input_event,"device"), "map<string, any>", null) | eval device_hostname=ucast(map_get(device,"hostname"),
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"string", null) | eval process=ucast(map_get(input_event,"process"), "map<string,
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any>", null) | eval process_file=ucast(map_get(process,"file"), "map<string, any>",
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null) | eval process_file_path=ucast(map_get(process_file,"path"), "string", null)
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| eval process_uid=ucast(map_get(process,"uid"), "string", null) | eval process_cmd_line=ucast(map_get(process,"cmd_line"),
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"string", null) | eval actor=ucast(map_get(input_event,"actor"), "map<string, any>",
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null) | eval actor_user=ucast(map_get(actor,"user"), "map<string, any>", null) |
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eval actor_user_uid=ucast(map_get(actor_user,"uid"), "string", null) | where match_regex(process_cmd_line,
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/(?i)get-objectacl/)=true OR match_regex(process_cmd_line, /(?i)get-domainobjectacl/)=true
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--finding_report--'
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how_to_implement: To successfully implement this analytic, you will need to enable
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PowerShell Script Block Logging on some or all endpoints. Additional setup here
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https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: Administrators may leverage PowerView for legitimate purposes,
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filter as needed.
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references:
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- https://attack.mitre.org/techniques/T1078/002/
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- https://medium.com/r3d-buck3t/enumerating-access-controls-in-active-directory-c06e2efa8b89
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- https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/abusing-active-directory-acls-aces
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- https://powersploit.readthedocs.io/en/latest/Recon/Get-DomainObjectAcl/
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tags:
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analytic_story:
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- Active Directory Privilege Escalation
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asset_type: Endpoint
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confidence: 50
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impact: 40
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message: PowerView AD acccess control list enumeration detected on $Computer$
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mitre_attack_id:
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- T1078.002
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- T1069
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observable:
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- name: device.hostname
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type: Hostname
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- name: process.file.path
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type: File
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- name: process.uid
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type: Other
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- name: process.cmd_line
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type: Other
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- name: actor.user.uid
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type: Other
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product:
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- Splunk Behavioral Analytics
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required_fields:
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- device.hostname
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- process.file.path
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- process.uid
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- process.cmd_line
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- actor.user.uid
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risk_score: 20
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security_domain: endpoint
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mappings:
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- ocsf: device.hostname
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cim: dest
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- ocsf: process.file.path
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cim: process_path
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- ocsf: process.uid
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cim: process_id
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- ocsf: process.cmd_line
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cim: process
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- ocsf: actor.user.uid
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cim: user_id
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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/T1078.002/powerview_acl_enumeration/windows-powershell.log
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source: XmlWinEventLog
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sourcetype: XmlWinEventLog
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