Entra ID Application Deletion

Severity: medium
Type: alert
Time window: 5m
Match by: user
Author: Google Cloud Security
Source: github.com/chronicle/detection-rules

Delete Entra ID application. This is a soft delete, can still be recovered.

Telemetry coverage

Platform	Record / event type
Azure	Delete application

Rules detecting the same action

These rules filter on the same operation.

Rule body

// Copyright 2025 Google LLC. Licensed under Apache-2.0.

rule entra_id_application_deletion {

  meta:
    author = "Google Cloud Security"
    description = "Delete Entra ID application. This is a soft delete, can still be recovered."
    rule_id = "mr_597d57bf-1bae-4179-a068-7985c2d28340"
    rule_name = "Entra ID Application Deletion"
    type = "alert"
    platform = "azure"
    data_source = "azure ad audit"
    severity = "Medium"
    priority = "Medium"

  events:
    $app.metadata.event_type = "SETTING_DELETION"
    $app.metadata.product_event_type = "Delete application"
    $app.metadata.product_name = "Azure AD Directory Audit"
    $app.metadata.vendor_name = "Microsoft"
    $app.security_result.action = "ALLOW"
    $app.principal.user.userid = $user

  match:
    $user over 5m

  outcome:
    $risk_score = 35
    $event_count = count_distinct($app.metadata.id)
    $principal_ip = array_distinct($app.principal.ip)
    $principal_email = array_distinct($app.principal.user.email_addresses)
    $principal_county_region = array_distinct($app.principal.ip_geo_artifact.location.country_or_region)
    $user_agent = array_distinct($app.network.http.user_agent)
    $network_session = array_distinct($app.network.session_id)
    $target_application = array_distinct($app.target.resource.name)
    $target_application_id = array_distinct($app.target.resource.product_object_id)

  condition:
    $app
}

YARA-L rule structure

Condition

Fires when at least one $app event in the 5m window.

Events

`$app` `SETTING_DELETION`

metadata.product_event_type = "Delete application"
security_result.action = "ALLOW"

Match and correlation

Match key: $user (principal.user.userid)
Within: 5m

Outcome

Outcome variables add context to a detection. When the rule generates an alert, $risk_score is displayed with it.

Field	Expression
`risk_score`	`35`
`event_count`	`count_distinct($app.metadata.id)`
`principal_ip`	`array_distinct($app.principal.ip)`
`principal_email`	`array_distinct($app.principal.user.email_addresses)`
`principal_county_region`	`array_distinct($app.principal.ip_geo_artifact.location.country_or_region)`
`user_agent`	`array_distinct($app.network.http.user_agent)`
`network_session`	`array_distinct($app.network.session_id)`
`target_application`	`array_distinct($app.target.resource.name)`
`target_application_id`	`array_distinct($app.target.resource.product_object_id)`