Understanding Microsoft Sentinel

Before we dive into the technical steps, let's briefly understand what Microsoft Sentinel is. It's a cloud-native security information and event management (SIEM) solution that helps you detect and respond to threats across your enterprise. To effectively use Sentinel, we first need to establish a foundational environment.

Creating a Log Analytics Workspace

The first step in building your Sentinel environment is to create a Log Analytics workspace. This workspace serves as the central repository for your security data.

1. Navigate to the Azure portal and search for "Microsoft Sentinel."

2. Click +Create and select Create a new workspace.

   

3. Provide a unique name for your workspace and choose an appropriate region.

4. Review the settings and click Create.

   

Deploying Microsoft Sentinel

Once the workspace is created, you can deploy Microsoft Sentinel to it.

1. Select the newly created workspace.

2. Click Add to initiate the Sentinel deployment process.

   

Assigning Necessary Permissions

To manage your Sentinel environment effectively, you'll need to assign appropriate permissions.

1. Identify a user or group that will manage Sentinel.
2. Navigate to the Resource Group Access Control settings.

3. Click Add and select Add role assignment.

   

4. Search for the Microsoft Sentinel Contributor role and assign it to the selected user or group.

   

   

Configuring Data Retention

To optimize storage costs and compliance requirements, it's essential to define a data retention policy.

1. Go to the Log Analytics Workspace you created earlier.

2. Under Settings, select Usage and estimated costs.

   

3. Choose Data retention and set the desired retention period (e.g., 180 days).

   

Summary

In this initial setup, we've established the core components of a Microsoft Sentinel environment: a Log Analytics workspace, Sentinel deployment, user permissions, and data retention policy. Building upon this foundation, we can start ingesting security data, creating analytics rules, and implementing incident response processes.

In the next post, we'll explore how to connect data sources to your Sentinel workspace.