GrantHighPrivilegeMicrosoftGraphPermissions.yaml

id: e57acdbc-fc60-42eb-8666-da9ce7bbf66e
name: Grant high privilege Microsoft Graph permissions
description: |
  'Identifies when an Application registration was granted a high privilege Microsoft Graph permission'
severity: Medium
requiredDataConnectors:
  - connectorId: AuditLogs
    dataTypes:
      - AuditLogs
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Persistence
relevantTechniques:
  - T1098
query: |
  let DangerousPermissions = dynamic(["AppRoleAssignment.ReadWrite.All","Application.ReadWrite.All","RoleManagement.ReadWrite.Directory"]);
  AuditLogs
  | where OperationName == "Add app role assignment to service principal"
  | mv-expand TargetResources
  | mv-expand TargetResources.modifiedProperties
  | where TargetResources_modifiedProperties.displayName == "AppRole.Value"
  | extend InitiatedByUserPrincipalName = InitiatedBy.user.userPrincipalName
  | extend AddedPermission = replace_string(tostring(TargetResources_modifiedProperties.newValue),'"','')
  | where AddedPermission in~ ( DangerousPermissions )
  | extend IPCustomEntity = todynamic(InitiatedBy).user.ipAddress
  | extend ServicePrincipalAppId = replace_string(tostring(todynamic(TargetResources).modifiedProperties[5].newValue),'"','')
  | extend ServicePrincipalDisplayName = replace_string(tostring(todynamic(TargetResources).modifiedProperties[6].newValue),'"','')
  | project timestamp = TimeGenerated, IPCustomEntity, AccountCustomEntity=InitiatedByUserPrincipalName, ServicePrincipalAppId, ServicePrincipalDisplayName, AddedPermission
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: AccountCustomEntity
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
version: 1.0.1
kind: Scheduled