Application ID URI Changed

Severity: medium
Time window: 1d
Author: Microsoft Security Research
Source: github.com/Azure/Azure-Sentinel

Detects changes to an Application ID URI. Monitor these changes to make sure that they were authorized. Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-applications#appid-uri-added-modified-or-removed

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1078.004` Valid Accounts: Cloud Accounts
Privilege Escalation	`T1078.004` Valid Accounts: Cloud Accounts

Event coverage

Provider	Event	Title
Entra-AuditLogs	_catch_all	Entra ID audit event (any operation)

Rules detecting the same action

Other rules on this platform that filter on the same API call or operation.

Admin promotion after Role Management Application Permission Grant (Kusto)
Application Redirect URL Update (Kusto)
Changes to Application Logout URL (Kusto)
Changes to Application Ownership (Kusto)
full_access_as_app Granted To Application (Kusto)
Mail.Read Permissions Granted to Application (Kusto)
Microsoft Entra ID Role Management Permission Grant (Kusto)
Suspicious application consent for offline access (Kusto)

Rule body kusto

id: 9fb2ee72-959f-4c2b-bc38-483affc539e4
name: Application ID URI Changed
description: |
  'Detects changes to an Application ID URI.
    Monitor these changes to make sure that they were authorized.
    Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-applications#appid-uri-added-modified-or-removed'
severity: Medium
requiredDataConnectors:
  - connectorId: AzureActiveDirectory
    dataTypes:
      - AuditLogs
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Persistence
  - PrivilegeEscalation
relevantTechniques:
  - T1078.004
tags:
  - AADSecOpsGuide
query: |
  AuditLogs
    | where Category == "ApplicationManagement"
    | where OperationName has_any ("Update Application", "Update Service principal")
    | where TargetResources has "AppIdentifierUri"
    | 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(InitiatedBy.user.ipAddress)
    | extend mod_props = TargetResources[0].modifiedProperties
    | extend TargetAppName = tostring(TargetResources[0].displayName)
    | mv-expand mod_props
    | where mod_props.displayName has "AppIdentifierUri"
    | extend OldURI = tostring(mod_props.oldValue)
    | extend NewURI = tostring(mod_props.newValue)
    | extend UpdatedBy = iif(isnotempty(InitiatingAppName), InitiatingAppName, InitiatingUserPrincipalName)
    | extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1])
    | project-reorder TimeGenerated, InitiatingAppName, InitiatingAppServicePrincipalId, InitiatingAadUserId, InitiatingUserPrincipalName, InitiatingIPAddress
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: InitiatingUserPrincipalName
      - identifier: Name
        columnName: InitiatingAccountName
      - identifier: UPNSuffix
        columnName: InitiatingAccountUPNSuffix
  - entityType: Account
    fieldMappings:
      - identifier: AadUserId
        columnName: InitiatingAadUserId
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: OldURI
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: NewURI
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: InitiatingIPAddress
version: 1.1.1
kind: Scheduled
metadata:
    source:
        kind: Community
    author:
        name: Microsoft Security Research
    support:
        tier: Community
    categories:
        domains: [ "Security - Others" ]

Stages and Predicates

Stage 1: `source`

AuditLogs

Stage 2: `where`

| where Category == "ApplicationManagement"

Stage 3: `where`

| where OperationName has_any ("Update Application", "Update Service principal")

Stage 4: `where`

| where TargetResources has "AppIdentifierUri"

Stage 5: `extend` (7 consecutive steps)

| 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(InitiatedBy.user.ipAddress)
| extend mod_props = TargetResources[0].modifiedProperties
| extend TargetAppName = tostring(TargetResources[0].displayName)

Stage 6: `mv-expand`

| mv-expand mod_props

Stage 7: `where`

| where mod_props.displayName has "AppIdentifierUri"

Stage 8: `extend` (4 consecutive steps)

| extend OldURI = tostring(mod_props.oldValue)
| extend NewURI = tostring(mod_props.newValue)
| extend UpdatedBy = iif(isnotempty(InitiatingAppName), InitiatingAppName, InitiatingUserPrincipalName)
| extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1])

Stage 9: `project-reorder`

| project-reorder TimeGenerated, InitiatingAppName, InitiatingAppServicePrincipalId, InitiatingAadUserId, InitiatingUserPrincipalName, InitiatingIPAddress

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`Category`	eq	`ApplicationManagement` transforms: `cased`
`OperationName`	match	`Update Application` `Update Service principal`
`TargetResources`	match	`AppIdentifierUri` transforms: `term`
`displayName`	match	`AppIdentifierUri` transforms: `term`

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

Field	Source
`InitiatingAppName`	`extend`
`InitiatingAppServicePrincipalId`	`extend`
`InitiatingUserPrincipalName`	`extend`
`InitiatingAadUserId`	`extend`
`InitiatingIPAddress`	`extend`
`mod_props`	`extend`
`TargetAppName`	`extend`
`OldURI`	`extend`
`NewURI`	`extend`
`UpdatedBy`	`extend`
`InitiatingAccountName`	`extend`
`InitiatingAccountUPNSuffix`	`extend`

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`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Application ID URI Changed

MITRE ATT&CK coverage

Event coverage

Rules detecting the same action

Rule body kusto

Stages and Predicates

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `where`

Stage 5: `extend` (7 consecutive steps)

Stage 6: `mv-expand`

Stage 7: `where`

Stage 8: `extend` (4 consecutive steps)

Stage 9: `project-reorder`

Indicators

Output fields

Keyboard shortcuts

Search operators

Application ID URI Changed

MITRE ATT&CK coverage

Event coverage

Rules detecting the same action

Rule body kusto

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: extend (7 consecutive steps)

Stage 6: mv-expand

Stage 7: where

Stage 8: extend (4 consecutive steps)

Stage 9: project-reorder

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `where`

Stage 5: `extend` (7 consecutive steps)

Stage 6: `mv-expand`

Stage 7: `where`

Stage 8: `extend` (4 consecutive steps)

Stage 9: `project-reorder`