Dataverse - Guest user exfiltration following Power Platform defense impairment
| 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 |
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
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
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
requiredDataConnectors:
- dataTypes:
- PowerPlatformAdminActivity
connectorId: PowerPlatformAdmin
- dataTypes:
- AuditLogs
connectorId: AzureActiveDirectory
- dataTypes:
- SecurityAlert
connectorId: AzureActiveDirectoryIdentityProtection
eventGroupingSettings:
aggregationKind: SingleAlert
name: Dataverse - Guest user exfiltration following Power Platform defense impairment
triggerThreshold: 0
version: 3.2.0
customDetails:
Environment: EnvironmentId
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
tactics:
- DefenseEvasion
- Exfiltration
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}} '
relevantTechniques:
- T1629
- T1567
triggerOperator: gt
kind: Scheduled
id: 39efbf4b-b347-4cc7-895e-99a868bf29ea
status: Available
queryFrequency: 1h
queryPeriod: 14d
{
"$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"
}
]
}