Auditlogs Changestoapplicationownership

KQL detection rule by ep3p · MIT

No description provided

AuditLogs
| where LoggedByService == "Core Directory" and Category == "ApplicationManagement" and OperationName has "owner"
| mv-apply modifiedProperty = TargetResources[0]["modifiedProperties"] on (
    summarize modifiedProperties = make_bag(bag_pack(tostring(modifiedProperty["displayName"]), bag_pack("oldValue", trim(@'[\"\s]+', tostring(modifiedProperty["oldValue"])), "newValue", trim(@'[\"\s]+', tostring(modifiedProperty["newValue"])))))
    )
| extend
    OwnerId = TargetResources[0]["id"],
    Owner = TargetResources[0]["userPrincipalName"],
    AppDisplayName = tostring(modifiedProperties[case(OperationName has "application", "Application.DisplayName", OperationName has "service principal", "ServicePrincipal.DisplayName", "")][case(AADOperationType == "Assign", "newValue", AADOperationType == "Unassign", "oldValue", "")]),
    AppId = tostring(modifiedProperties[case(OperationName has "application", "Application.AppId", OperationName has "service principal", "ServicePrincipal.AppId", "")]["newValue"]),
    Initiator = iif(isnotempty(InitiatedBy["app"]), tostring(InitiatedBy["app"]["displayName"]), tostring(InitiatedBy["user"]["userPrincipalName"])),
    InitiatorId = iif(isnotempty(InitiatedBy["app"]), tostring(InitiatedBy["app"]["servicePrincipalId"]), tostring(InitiatedBy["user"]["id"])),
    IPAddress = tostring(InitiatedBy[tostring(bag_keys(InitiatedBy)[0])]["ipAddress"])
| project
    TimeGenerated,
    LoggedByService,
    Category,
    AADOperationType,
    Initiator,
    IPAddress,
    OperationName,
    Result,
    Owner,
    AppDisplayName,
    InitiatedBy,
    AdditionalDetails,
    TargetResources,
    InitiatorId,
    OwnerId,
    AppId,
    CorrelationId

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

3ba64148-9d49-4b78-b590-871545f2e64d

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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