Create alert API

API description

Creates new Alert on top of Event.

• Microsoft Defender for Endpoint Event is required for the alert creation.
• You need to supply three parameters from the Event in the request: Event Time, Machine ID, and Report ID. See example below.
• You can use an event found in Advanced Hunting API or Portal.
• If there existing an open alert on the same Device with the same Title, the new created alert is merged with it.
• An automatic investigation starts automatically on alerts created via the API.

Limitations

Rate limitations for this API are 15 calls per minute.

Permissions

When obtaining a token using user credentials:

• The user needs to have at least the following role permission: Alerts investigation. For more information, see Create and manage roles.

• The user needs to have access to the device associated with the alert, based on device group settings. For more information, see Create and manage device groups.

One of the following permissions is required to call this API. For more information on how to choose permissions, see Use Microsoft Defender for Endpoint APIs.

Permission type	Permission	Permission display name
Application	Alert.ReadWrite.All	'Read and write all alerts'
Delegated (work or school account)	Alert.ReadWrite	'Read and write alerts'

HTTP request

POST https://api.securitycenter.microsoft.com/api/alerts/CreateAlertByReference

Request headers

Name	Type	Description
Authorization	String	Bearer {token}. Required.
Content-Type	String	application/json. Required.

Request body

In the request body, supply the following values (all are required):

Property	Type	Description
eventTime	DateTime(UTC)	The precise time of the event as string, as obtained from advanced hunting. For example, 2018-08-03T16:45:21.7115183Z Required.
reportId	String	The reportId of the event, as obtained from advanced hunting. Required.
machineId	String	Id of the device on which the event was identified. Required.
severity	String	Severity of the alert. The property values are: 'Low', 'Medium' and 'High'. Required.
title	String	Title for the alert. Required.
description	String	Description of the alert. Required.
recommendedAction	String	Security officer needs to take this action when analyzing the alert. Required.
category	String	Category of the alert. The property values are: "General", "CommandAndControl", "Collection", "CredentialAccess", "DefenseEvasion", "Discovery", "Exfiltration", "Exploit", "Execution", "InitialAccess", "LateralMovement", "Malware", "Persistence", "PrivilegeEscalation", "Ransomware", "SuspiciousActivity" Required.

Response

If successful, this method returns 200 OK, and a new alert object in the response body. If event with the specified properties (reportId, eventTime and machineId) wasn't found - 404 Not Found.

Example

Request

Here's an example of the request.

POST https://api.securitycenter.microsoft.com/api/alerts/CreateAlertByReference

{
    "machineId": "1e5bc9d7e413ddd7902c2932e418702b84d0cc07",
    "severity": "Low",
    "title": "example",
    "description": "example alert",
    "recommendedAction": "nothing",
    "eventTime": "2018-08-03T16:45:21.7115183Z",
    "reportId": "20776",
    "category": "Exploit"
}