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To automate responses to threats detected by Azure Sentinel, you should use Azure Logic Apps.

Azure Logic Apps is a cloud-based service provided by Microsoft Azure that allows you to build and orchestrate automated workflows. It enables you to connect different systems and services together to automate tasks and processes. With Azure Logic Apps, you can easily integrate Azure Sentinel with other services to trigger automated responses when threats are detected.

Here's how you can set up automated responses using Azure Logic Apps with Azure Sentinel:

1. Create a Logic App: Start by creating an Azure Logic App in the Azure portal. Give it a name, select the subscription and resource group, and choose the appropriate location.

2. Trigger Configuration: Configure the trigger for your Logic App. In this case, you would want to use the "When a response to an Azure Sentinel alert is triggered" trigger. This trigger will fire whenever an alert is generated in Azure Sentinel.

3. Connect Azure Sentinel: Connect your Azure Sentinel workspace to the Logic App. Select your Azure Sentinel workspace and provide the necessary permissions for the Logic App to access the alerts.

4. Define Actions: Once the Logic App is triggered by an alert, you can define the actions you want it to perform. For example, you can use actions like sending an email notification, creating a ticket in a ticketing system, or running a remediation script.

5. Configure Conditions: You can also add conditions to your Logic App to perform specific actions based on the properties of the alert. For instance, you might want to perform different actions for high-severity alerts compared to low-severity alerts.

6. Test and Enable: Once you have configured your Logic App, you can test it by triggering an alert in Azure Sentinel and verifying if the expected actions are performed. After testing, enable the Logic App to start automating responses to future threats detected by Azure Sentinel.

By using Azure Logic Apps in conjunction with Azure Sentinel, you can automate responses to threats, thereby reducing the time it takes to mitigate potential risks and ensuring a more efficient and streamlined security operation.

The correct answer for this question is not listed among the given options. The appropriate tool to automate responses to threats detected by Azure Sentinel is Azure Sentinel's Automated Response feature.

Azure Sentinel is a cloud-native Security Information and Event Management (SIEM) tool that provides intelligent security analytics and threat intelligence across enterprise networks. It analyzes data from various sources, such as security logs, network traffic, and cloud resources, to detect security threats and incidents.

To automate responses to threats detected by Azure Sentinel, you can use its Automated Response feature. This feature allows you to create automated playbooks that execute a series of predefined actions when specific conditions are met. These playbooks can perform a range of actions, such as sending notifications, blocking IP addresses, disabling user accounts, or running custom scripts.

To create an automated playbook, you can use Azure Logic Apps, a cloud-based service that allows you to create workflows that integrate with various Azure services and external systems. Logic Apps provides a wide range of prebuilt connectors and triggers that allow you to easily automate responses to security incidents detected by Azure Sentinel.

In summary, the appropriate tool to automate responses to threats detected by Azure Sentinel is Azure Sentinel's Automated Response feature, which allows you to create playbooks that execute predefined actions when specific conditions are met. To create these playbooks, you can use Azure Logic Apps, which provides a range of prebuilt connectors and triggers for integrating with Azure services and external systems.