[Entra ID] Application Granted Administrative Permission to Assign Microsoft Entra ID Roles

Requête originale, sans modification.

AuditLogs
| where Category =~ "ApplicationManagement"
    and LoggedByService =~ "Core Directory"
    and OperationName in~ ("Add delegated permission grant", "Add app role assignment to service principal")
| mv-apply TargetResource = TargetResources on
    (
    where TargetResource.type =~ "ServicePrincipal"
        and array_length(TargetResource.modifiedProperties) > 0
        and isnotnull(TargetResource.displayName)
    | extend props = TargetResource.modifiedProperties
    )
| mv-apply Property = props on
    (
    where Property.displayName in~ ("AppRole.Value", "DelegatedPermissionGrant.Scope")
    | extend
        DisplayName = tostring(Property.displayName),
        PermissionGrant = trim('"', tostring(Property.newValue))
    )
| where PermissionGrant has "RoleManagement.ReadWrite.Directory"
| mv-apply Property = props on
    (
    where Property.displayName =~ "ServicePrincipal.DisplayName"
    | extend TargetAppDisplayName = trim('"', tostring(Property.newValue))
    )
| mv-apply Property = props on
    (
    where Property.displayName =~ "ServicePrincipal.ObjectID"
    | extend TargetAppServicePrincipalId = trim('"', tostring(Property.newValue))
    )
| 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 TargetAppDisplayName = tostring(iff(isnotempty(TargetAppDisplayName), TargetAppDisplayName, TargetAppServicePrincipalId))
| extend
    InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]),
    InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1])
| extend Initiator = InitiatingAccountName, Target = TargetAppDisplayName
| extend
    Source_Network_IPLocation = ""
| project
        Alert_Category_en = "Entra ID",
    Alert_SubCategory_en = "Anomaly Identity Privilege Modification",
    Alert_Name_en = "Application Granted Administrative Permission to Assign Microsoft Entra ID Roles",
    Alert_Description_en = strcat("At Taiwan time", format_datetime(datetime_utc_to_local(TimeGenerated, "Asia/Taipei"), "yyyy-MM-dd HH:mm:ss"), ". ", "EntraID:", "", ". ", "detected source user/service principal ", iff(isnotempty(InitiatingUserPrincipalName), InitiatingUserPrincipalName, InitiatingAppName), " granted application: ", TargetAppDisplayName, ".", " administrative permission to assign Microsoft Entra ID roles: ", ActivityDisplayName, ". Source IP: ", InitiatingIpAddress, ", source location: ", Source_Network_IPLocation),
    Alert_TriageStep_en = strcat(
                          "1. Confirm whether the operating user/service principal: ",
                          iff(isnotempty(InitiatingUserPrincipalName), InitiatingUserPrincipalName, InitiatingAppName),
                          ", source IP: ",
                          InitiatingIpAddress,
                          " is abnormal. ",
                          "2. Review the authorized target application ",
                          TargetAppDisplayName,
                          "  authorization content: ",
                          ActivityDisplayName,
                          " to determine whether it is an expected operation or maintenance task."
                      ),
    Alert_Containment_en = strcat(
                           "1. If determined to be unauthorized or suspicious privilege escalation, immediately remove the permissions from target application: ",
                           TargetAppDisplayName,
                           " and disable it.",
                           "2. Perform risk handling for the initiator  ",
                           iff(isnotempty(InitiatingUserPrincipalName), InitiatingUserPrincipalName, InitiatingAppName),
                           "  (revoke sessions/force re-authentication, and suspend directory management permissions if necessary)."
                       ),
    Alert_Remediation_en =
    "1. Strengthen application and permission governance: apply least privilege and administrator approval processes for high-risk Graph/Directory permissions, and include Service Principal credential/permission changes in regular audits.  "
    "2. Strengthen detection and automation: establish automated response (SOAR) for notification/source blocking/user verification.",
            Alert_Time_TW = datetime_utc_to_local(TimeGenerated, "Asia/Taipei"),
    Alert_Time_UTC0 = TimeGenerated,
    Event_Action = ActivityDisplayName,
    Event_Status = Result,
    Event_Description = PermissionGrant,
    Source_Identity_FullName = iff(isnotempty(InitiatingUserPrincipalName), InitiatingUserPrincipalName, InitiatingAppName),
    Source_Identity_ID = iff(isnotempty(InitiatingAadUserId), InitiatingAadUserId, InitiatingAppServicePrincipalId),
    Source_Identity_Type = iff(isnotempty(InitiatingUserPrincipalName), "User", "Service"),
    Source_Network_IPAddress = InitiatingIpAddress,
    Source_Network_IPLocation = Source_Network_IPLocation,
    Target_Identity_FullName = TargetAppDisplayName,
    Target_Identity_ID = TargetAppServicePrincipalId,
    Target_Identity_Type = "Service",
    Target_Resource_ID = "",
    Target_Resource_Name = "Microsoft Entra ID",
    Target_Resource_Type = "Microsoft Entra ID"