Entra ID Successful Group Deletion

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

Detects when a group is deleted.

Telemetry coverage

Platform	Record / event type
Azure	Delete group

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_group_deletion_success {

  meta:
    author = "Google Cloud Security"
    description = "Detects when a group is deleted."
    rule_id = "mr_d6a3162a-3ec5-45c1-a7cd-ff2988582924"
    rule_name = "Entra ID Successful Group Deletion"
    type = "alert"
    platform = "azure"
    data_source = "azure ad audit"
    severity = "Low"
    priority = "Low"

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

  match:
    $user over 5m

  outcome:
    $risk_score = 35
    $event_count = count_distinct($group.metadata.id)
    $user_agent = array_distinct($group.network.http.user_agent)
    $principal_ip = array_distinct($group.principal.ip)
    $principal_user_userid = array_distinct($group.principal.user.email_addresses)
    $group_name = array_distinct($group.target.resource.name)
    $group_guid = array_distinct($group.target.resource.product_object_id)

  condition:
    $group
}

YARA-L rule structure

Condition

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

Events

`$group` `GROUP_DELETION`

metadata.product_event_type = "Delete group"
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($group.metadata.id)`
`user_agent`	`array_distinct($group.network.http.user_agent)`
`principal_ip`	`array_distinct($group.principal.ip)`
`principal_user_userid`	`array_distinct($group.principal.user.email_addresses)`
`group_name`	`array_distinct($group.target.resource.name)`
`group_guid`	`array_distinct($group.target.resource.product_object_id)`