Dataverse - Guest user exfiltration following Power Platform defense impairment

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Id	39efbf4b-b347-4cc7-895e-99a868bf29ea
Rulename	Dataverse - Guest user exfiltration following Power Platform defense impairment
Description	Identifies a chain of events starting with disablement of Power Platform tenant isolation and removal of an environment’s access security group. These events are correlated with Dataverse exfiltration alerts associated with the impacted environment and recently created Microsoft Entra guest users. Note: Activate other Dataverse analytics rules with the MITRE tactic ‘Exfiltration’ before enabling this rule.
Severity	High
Tactics	DefenseEvasion Exfiltration
Techniques	T1629 T1567
Required data connectors	AzureActiveDirectory AzureActiveDirectoryIdentityProtection PowerPlatformAdmin
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Guest user exfiltration following Power Platform defense impairment.yaml
Version	3.2.0
Arm template	39efbf4b-b347-4cc7-895e-99a868bf29ea.json

KQL

let query_lookback = 14d;
let query_frequncy = 1h;
let defense_evasion_events = PowerPlatformAdminActivity
    | where TimeGenerated >= ago(query_lookback)
    | where EventOriginalType == "TenantIsolationOperation"
    | mv-expand PropertyCollection
    | where PropertyCollection.Name == "powerplatform.analytics.resource.tenant.isolation_policy.enabled"
    | where PropertyCollection.Value == "False"
    | summarize
        TenantIsolationRemovalTimestamp = max(TimeGenerated)
        by SecurityDisablingUser = ActorName
    | join kind=inner (
        PowerPlatformAdminActivity
        | where TimeGenerated >= ago(query_lookback)
        | where EventOriginalType == "EnvironmentPropertyChange"
        | where PropertyCollection has "Property: SecurityGroupId, Old Value: , New Value: "
        | mv-expand PropertyCollection
        | extend
            GroupRemovalTimestamp = TimeGenerated,
            InstanceUrl = tostring(iif(PropertyCollection.Name == "powerplatform.analytics.resource.environment.url", PropertyCollection.Value, "")),
            EnvironmentId = tostring(iif(PropertyCollection.Name == "powerplatform.analytics.resource.environment.name", PropertyCollection.Value, ""))
        | summarize InstanceUrl = max(InstanceUrl), EnvironmentId = max(EnvironmentId) by GroupRemovalTimestamp, SecurityDisablingUser = ActorName)
        on SecurityDisablingUser
    | summarize
        GroupRemovalTimestamp = max(GroupRemovalTimestamp),
        TenantIsolationRemovalTimestamp = max(TenantIsolationRemovalTimestamp)
        by SecurityDisablingUser, InstanceUrl, EnvironmentId;
let exfiltration_alerts = SecurityAlert
    | where TimeGenerated >= ago(query_frequncy)
    | where Tactics has "Exfiltration"
    | where Entities has ('"AppId":32780')
    | mv-expand todynamic(Entities)
    | extend AlertUPN = iif(Entities.Type == "account", strcat(Entities.Name, "@", Entities.UPNSuffix), "")
    | extend InstanceUrl = tostring(iif(Entities.AppId == 32780, Entities.InstanceName, ""))
    | join kind=inner defense_evasion_events on InstanceUrl
    | where StartTime > TenantIsolationRemovalTimestamp and StartTime > GroupRemovalTimestamp
    | summarize InstanceUrl = max(InstanceUrl), AlertUPN = max(AlertUPN) by AlertName, SystemAlertId
    | extend AlertDetails = bag_pack("AlertName", AlertName, "SystemAlertId", SystemAlertId)
    | summarize AlertDetails = make_set(AlertDetails, 100) by AlertUPN, InstanceUrl
    | join kind=inner (
        AuditLogs
        | where OperationName == "Update user"
        | where Identity == "Microsoft Invitation Acceptance Portal"
        | mv-expand TargetResources
        | extend ModifiedProperties = TargetResources.modifiedProperties
        | mv-expand ModifiedProperties
        | where ModifiedProperties.displayName == "AcceptedAs"
        | summarize RedeemTime = max(TimeGenerated) by GuestUser = tostring(parse_json(replace_regex(tostring(ModifiedProperties.newValue), "\\r", ""))[0]))
        on $left.AlertUPN == $right.GuestUser;
defense_evasion_events
| join kind=inner exfiltration_alerts on InstanceUrl
| extend
    AccountName = tostring(split(SecurityDisablingUser, "@")[0]),
    UPNSuffix = tostring(split(SecurityDisablingUser, "@")[1]),
    GuestAccountName = tostring(split(GuestUser, "@")[0]),
    GuestUPNSuffix = tostring(split(GuestUser, "@")[0]),
    DataverseId = 32780
| project
    SecurityDisablingUser,
    GuestUser,
    AlertDetails,
    TenantIsolationRemovalTimestamp,
    GroupRemovalTimestamp,
    InstanceUrl,
    EnvironmentId,
    AccountName,
    UPNSuffix,
    GuestAccountName,
    GuestUPNSuffix,
    DataverseId

YAML

relevantTechniques:
- T1629
- T1567
requiredDataConnectors:
- dataTypes:
  - PowerPlatformAdminActivity
  connectorId: PowerPlatformAdmin
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
- dataTypes:
  - SecurityAlert
  connectorId: AzureActiveDirectoryIdentityProtection
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Name
    columnName: GuestAccountName
  - identifier: UPNSuffix
    columnName: GuestUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: AppId
    columnName: DataverseId
  - identifier: InstanceName
    columnName: InstanceUrl
  entityType: CloudApplication
queryFrequency: 1h
queryPeriod: 14d
version: 3.2.0
eventGroupingSettings:
  aggregationKind: SingleAlert
id: 39efbf4b-b347-4cc7-895e-99a868bf29ea
customDetails:
  Environment: EnvironmentId
alertDetailsOverride:
  alertDisplayNameFormat: 'Dataverse - exfiltration alerts following defense impairment in {{InstanceUrl}} '
  alertDescriptionFormat: '{{SecurityDisablingUser}} disabled Power Platform tenant isolation and removed the security group used to control access to {{{InstanceUrl}}. Exfiltration alerts associated with guest users were then detected from user {{{GuestUser}}'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Guest user exfiltration following Power Platform defense impairment.yaml
query: |
  let query_lookback = 14d;
  let query_frequncy = 1h;
  let defense_evasion_events = PowerPlatformAdminActivity
      | where TimeGenerated >= ago(query_lookback)
      | where EventOriginalType == "TenantIsolationOperation"
      | mv-expand PropertyCollection
      | where PropertyCollection.Name == "powerplatform.analytics.resource.tenant.isolation_policy.enabled"
      | where PropertyCollection.Value == "False"
      | summarize
          TenantIsolationRemovalTimestamp = max(TimeGenerated)
          by SecurityDisablingUser = ActorName
      | join kind=inner (
          PowerPlatformAdminActivity
          | where TimeGenerated >= ago(query_lookback)
          | where EventOriginalType == "EnvironmentPropertyChange"
          | where PropertyCollection has "Property: SecurityGroupId, Old Value: , New Value: "
          | mv-expand PropertyCollection
          | extend
              GroupRemovalTimestamp = TimeGenerated,
              InstanceUrl = tostring(iif(PropertyCollection.Name == "powerplatform.analytics.resource.environment.url", PropertyCollection.Value, "")),
              EnvironmentId = tostring(iif(PropertyCollection.Name == "powerplatform.analytics.resource.environment.name", PropertyCollection.Value, ""))
          | summarize InstanceUrl = max(InstanceUrl), EnvironmentId = max(EnvironmentId) by GroupRemovalTimestamp, SecurityDisablingUser = ActorName)
          on SecurityDisablingUser
      | summarize
          GroupRemovalTimestamp = max(GroupRemovalTimestamp),
          TenantIsolationRemovalTimestamp = max(TenantIsolationRemovalTimestamp)
          by SecurityDisablingUser, InstanceUrl, EnvironmentId;
  let exfiltration_alerts = SecurityAlert
      | where TimeGenerated >= ago(query_frequncy)
      | where Tactics has "Exfiltration"
      | where Entities has ('"AppId":32780')
      | mv-expand todynamic(Entities)
      | extend AlertUPN = iif(Entities.Type == "account", strcat(Entities.Name, "@", Entities.UPNSuffix), "")
      | extend InstanceUrl = tostring(iif(Entities.AppId == 32780, Entities.InstanceName, ""))
      | join kind=inner defense_evasion_events on InstanceUrl
      | where StartTime > TenantIsolationRemovalTimestamp and StartTime > GroupRemovalTimestamp
      | summarize InstanceUrl = max(InstanceUrl), AlertUPN = max(AlertUPN) by AlertName, SystemAlertId
      | extend AlertDetails = bag_pack("AlertName", AlertName, "SystemAlertId", SystemAlertId)
      | summarize AlertDetails = make_set(AlertDetails, 100) by AlertUPN, InstanceUrl
      | join kind=inner (
          AuditLogs
          | where OperationName == "Update user"
          | where Identity == "Microsoft Invitation Acceptance Portal"
          | mv-expand TargetResources
          | extend ModifiedProperties = TargetResources.modifiedProperties
          | mv-expand ModifiedProperties
          | where ModifiedProperties.displayName == "AcceptedAs"
          | summarize RedeemTime = max(TimeGenerated) by GuestUser = tostring(parse_json(replace_regex(tostring(ModifiedProperties.newValue), "\\r", ""))[0]))
          on $left.AlertUPN == $right.GuestUser;
  defense_evasion_events
  | join kind=inner exfiltration_alerts on InstanceUrl
  | extend
      AccountName = tostring(split(SecurityDisablingUser, "@")[0]),
      UPNSuffix = tostring(split(SecurityDisablingUser, "@")[1]),
      GuestAccountName = tostring(split(GuestUser, "@")[0]),
      GuestUPNSuffix = tostring(split(GuestUser, "@")[0]),
      DataverseId = 32780
  | project
      SecurityDisablingUser,
      GuestUser,
      AlertDetails,
      TenantIsolationRemovalTimestamp,
      GroupRemovalTimestamp,
      InstanceUrl,
      EnvironmentId,
      AccountName,
      UPNSuffix,
      GuestAccountName,
      GuestUPNSuffix,
      DataverseId  
status: Available
kind: Scheduled
tactics:
- DefenseEvasion
- Exfiltration
severity: High
name: Dataverse - Guest user exfiltration following Power Platform defense impairment
triggerOperator: gt
description: |
  Identifies a chain of events starting with disablement of Power Platform tenant isolation and removal of an environment's access security group. These events are correlated with Dataverse exfiltration alerts associated with the impacted environment and recently created Microsoft Entra guest users.

  Note: Activate other Dataverse analytics rules with the MITRE tactic 'Exfiltration' before enabling this rule.

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/39efbf4b-b347-4cc7-895e-99a868bf29ea')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/39efbf4b-b347-4cc7-895e-99a868bf29ea')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "{{SecurityDisablingUser}} disabled Power Platform tenant isolation and removed the security group used to control access to {{{InstanceUrl}}. Exfiltration alerts associated with guest users were then detected from user {{{GuestUser}}",
          "alertDisplayNameFormat": "Dataverse - exfiltration alerts following defense impairment in {{InstanceUrl}} "
        },
        "alertRuleTemplateName": "39efbf4b-b347-4cc7-895e-99a868bf29ea",
        "customDetails": {
          "Environment": "EnvironmentId"
        },
        "description": "Identifies a chain of events starting with disablement of Power Platform tenant isolation and removal of an environment's access security group. These events are correlated with Dataverse exfiltration alerts associated with the impacted environment and recently created Microsoft Entra guest users.\n\nNote: Activate other Dataverse analytics rules with the MITRE tactic 'Exfiltration' before enabling this rule.\n",
        "displayName": "Dataverse - Guest user exfiltration following Power Platform defense impairment",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "GuestAccountName",
                "identifier": "Name"
              },
              {
                "columnName": "GuestUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "DataverseId",
                "identifier": "AppId"
              },
              {
                "columnName": "InstanceUrl",
                "identifier": "InstanceName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Guest user exfiltration following Power Platform defense impairment.yaml",
        "query": "let query_lookback = 14d;\nlet query_frequncy = 1h;\nlet defense_evasion_events = PowerPlatformAdminActivity\n    | where TimeGenerated >= ago(query_lookback)\n    | where EventOriginalType == \"TenantIsolationOperation\"\n    | mv-expand PropertyCollection\n    | where PropertyCollection.Name == \"powerplatform.analytics.resource.tenant.isolation_policy.enabled\"\n    | where PropertyCollection.Value == \"False\"\n    | summarize\n        TenantIsolationRemovalTimestamp = max(TimeGenerated)\n        by SecurityDisablingUser = ActorName\n    | join kind=inner (\n        PowerPlatformAdminActivity\n        | where TimeGenerated >= ago(query_lookback)\n        | where EventOriginalType == \"EnvironmentPropertyChange\"\n        | where PropertyCollection has \"Property: SecurityGroupId, Old Value: , New Value: \"\n        | mv-expand PropertyCollection\n        | extend\n            GroupRemovalTimestamp = TimeGenerated,\n            InstanceUrl = tostring(iif(PropertyCollection.Name == \"powerplatform.analytics.resource.environment.url\", PropertyCollection.Value, \"\")),\n            EnvironmentId = tostring(iif(PropertyCollection.Name == \"powerplatform.analytics.resource.environment.name\", PropertyCollection.Value, \"\"))\n        | summarize InstanceUrl = max(InstanceUrl), EnvironmentId = max(EnvironmentId) by GroupRemovalTimestamp, SecurityDisablingUser = ActorName)\n        on SecurityDisablingUser\n    | summarize\n        GroupRemovalTimestamp = max(GroupRemovalTimestamp),\n        TenantIsolationRemovalTimestamp = max(TenantIsolationRemovalTimestamp)\n        by SecurityDisablingUser, InstanceUrl, EnvironmentId;\nlet exfiltration_alerts = SecurityAlert\n    | where TimeGenerated >= ago(query_frequncy)\n    | where Tactics has \"Exfiltration\"\n    | where Entities has ('\"AppId\":32780')\n    | mv-expand todynamic(Entities)\n    | extend AlertUPN = iif(Entities.Type == \"account\", strcat(Entities.Name, \"@\", Entities.UPNSuffix), \"\")\n    | extend InstanceUrl = tostring(iif(Entities.AppId == 32780, Entities.InstanceName, \"\"))\n    | join kind=inner defense_evasion_events on InstanceUrl\n    | where StartTime > TenantIsolationRemovalTimestamp and StartTime > GroupRemovalTimestamp\n    | summarize InstanceUrl = max(InstanceUrl), AlertUPN = max(AlertUPN) by AlertName, SystemAlertId\n    | extend AlertDetails = bag_pack(\"AlertName\", AlertName, \"SystemAlertId\", SystemAlertId)\n    | summarize AlertDetails = make_set(AlertDetails, 100) by AlertUPN, InstanceUrl\n    | join kind=inner (\n        AuditLogs\n        | where OperationName == \"Update user\"\n        | where Identity == \"Microsoft Invitation Acceptance Portal\"\n        | mv-expand TargetResources\n        | extend ModifiedProperties = TargetResources.modifiedProperties\n        | mv-expand ModifiedProperties\n        | where ModifiedProperties.displayName == \"AcceptedAs\"\n        | summarize RedeemTime = max(TimeGenerated) by GuestUser = tostring(parse_json(replace_regex(tostring(ModifiedProperties.newValue), \"\\\\r\", \"\"))[0]))\n        on $left.AlertUPN == $right.GuestUser;\ndefense_evasion_events\n| join kind=inner exfiltration_alerts on InstanceUrl\n| extend\n    AccountName = tostring(split(SecurityDisablingUser, \"@\")[0]),\n    UPNSuffix = tostring(split(SecurityDisablingUser, \"@\")[1]),\n    GuestAccountName = tostring(split(GuestUser, \"@\")[0]),\n    GuestUPNSuffix = tostring(split(GuestUser, \"@\")[0]),\n    DataverseId = 32780\n| project\n    SecurityDisablingUser,\n    GuestUser,\n    AlertDetails,\n    TenantIsolationRemovalTimestamp,\n    GroupRemovalTimestamp,\n    InstanceUrl,\n    EnvironmentId,\n    AccountName,\n    UPNSuffix,\n    GuestAccountName,\n    GuestUPNSuffix,\n    DataverseId\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Exfiltration"
        ],
        "techniques": [
          "T1567"
        ],
        "templateVersion": "3.2.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}