Cross-tenant Access Settings Organization Inbound Collaboration Settings Changed

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Id	c895c5b9-0fc6-40ce-9830-e8818862f2d5
Rulename	Cross-tenant Access Settings Organization Inbound Collaboration Settings Changed
Description	Organizations are added in the Cross-tenant Access Settings to control communication inbound or outbound for users and applications. This detection notifies when Organization Inbound Collaboration Settings are changed for “Users & Groups” and for “Applications”.
Severity	Medium
Tactics	InitialAccess Persistence Discovery
Techniques	T1078.004 T1136.003 T1087.004
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	2d
Query period	2d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/Cross-tenantAccessSettingsOrganizationInboundCollaborationSettingsChanged.yaml
Version	1.1.1
Arm template	c895c5b9-0fc6-40ce-9830-e8818862f2d5.json

KQL

// In User & Groups and in Applications, the following "AccessType" values in columns PremodifiedInboundSettings and ModifiedInboundSettings are interpreted accordingly
// When Access Type in premodified inbound settings value was 1 that means that the initial access was allowed. When Access Type in premodified inbound settings value was 2 that means that the initial access was blocked.
// When Access Type in modified inbound settings value is 1 that means that now access is allowed. When Access Type in modified inbound settings value is 2 that means that now access is blocked.
AuditLogs
| where OperationName has "Update a partner cross-tenant access setting"
| mv-apply TargetResource = TargetResources on
  (
      where TargetResource.type =~ "Policy"
      | extend Properties = TargetResource.modifiedProperties
  )
| mv-apply Property = Properties on
  (
      where Property.displayName =~ "b2bCollaborationInbound"
      | extend PremodifiedInboundSettings = trim('"',tostring(Property.oldValue)),
               ModifiedInboundSettings = trim(@'"',tostring(Property.newValue))
  )
| where PremodifiedInboundSettings != ModifiedInboundSettings
| extend InitiatingAppName = tostring(InitiatedBy.app.displayName)
| extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)
| extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)
| extend InitiatingAadUserId = tostring(InitiatedBy.user.id)
| extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))
| extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1])

YAML

triggerThreshold: 0
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: InitiatingAppName
  - identifier: AadUserId
    columnName: InitiatingAppServicePrincipalId
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: InitiatingUserPrincipalName
  - identifier: Name
    columnName: InitiatingAccountName
  - identifier: UPNSuffix
    columnName: InitiatingAccountUPNSuffix
- entityType: Account
  fieldMappings:
  - identifier: AadUserId
    columnName: InitiatingAadUserId
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: InitiatingIpAddress
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/Cross-tenantAccessSettingsOrganizationInboundCollaborationSettingsChanged.yaml
name: Cross-tenant Access Settings Organization Inbound Collaboration Settings Changed
relevantTechniques:
- T1078.004
- T1136.003
- T1087.004
status: Available
version: 1.1.1
queryPeriod: 2d
kind: Scheduled
id: c895c5b9-0fc6-40ce-9830-e8818862f2d5
query: |
  // In User & Groups and in Applications, the following "AccessType" values in columns PremodifiedInboundSettings and ModifiedInboundSettings are interpreted accordingly
  // When Access Type in premodified inbound settings value was 1 that means that the initial access was allowed. When Access Type in premodified inbound settings value was 2 that means that the initial access was blocked.
  // When Access Type in modified inbound settings value is 1 that means that now access is allowed. When Access Type in modified inbound settings value is 2 that means that now access is blocked.
  AuditLogs
  | where OperationName has "Update a partner cross-tenant access setting"
  | mv-apply TargetResource = TargetResources on
    (
        where TargetResource.type =~ "Policy"
        | extend Properties = TargetResource.modifiedProperties
    )
  | mv-apply Property = Properties on
    (
        where Property.displayName =~ "b2bCollaborationInbound"
        | extend PremodifiedInboundSettings = trim('"',tostring(Property.oldValue)),
                 ModifiedInboundSettings = trim(@'"',tostring(Property.newValue))
    )
  | where PremodifiedInboundSettings != ModifiedInboundSettings
  | extend InitiatingAppName = tostring(InitiatedBy.app.displayName)
  | extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)
  | extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)
  | extend InitiatingAadUserId = tostring(InitiatedBy.user.id)
  | extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))
  | extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1])  
description: |
    'Organizations are added in the Cross-tenant Access Settings to control communication inbound or outbound for users and applications. This detection notifies when Organization Inbound Collaboration Settings are changed for "Users & Groups" and for "Applications".'
queryFrequency: 2d
severity: Medium
triggerOperator: gt
tactics:
- InitialAccess
- Persistence
- Discovery

ARM