What Do I Get When I Turn on Azure Defender?

what-do-i-get-when-i-turn-on-azure-denfender

Determine the cybersecurity return on investment in Azure.

Azure is very keen on selling their users security services like Azure Defender, but it takes considerable effort and time to understand what each of them does. An Azure security admin assigned to Azure must also explain what Azure Defender does for each of these resources to justify the additional expenditure.

In this blog, we will give a summary of what each of the Azure Defender options does and how a person responsible for Azure security can calculate the security return on investment for turning each of these Azure Defender options on.

Servers

This option turns on Azure Defender for Windows and Linux VMs being hosted in the Azure Virtual Machines menu. This is the most robust Azure Defender offering because of the high number of detections that become available. Microsoft put a sizable amount of effort into this offering because it is their cloud EDR solution for VMs.

The security return on investment can be calculated by using your organization’s Annualized Loss Expectancy (ALE) calculation and comparing that cost to the annual cost of $180 per VM. The VMs that have an ALE above $180 have a strong case for having Azure Defender enabled.

Software Development Platforms

In these platforms Azure Defender looks for signs of applications behaving in ways that may be a sign of compromise like commands found in the wrong area of an application, suspicious behavior, and unexpected processes.

The security return on investment can be calculated by using your organization’s Annualized Loss Expectancy (ALE) calculation and comparing that cost to the annual cost of $180 per app service, $24 per Kubernetes VM core, or $3.50 per container image.

Storage Spaces

For each of these options Azure Defender looks for signs of malicious activity in storage spaces like unexpected files found in storage, unusual volume of data movement, and unusual change in permissions.

The security return on investment can be calculated for SQL servers by using your organization’s Annualized Loss Expectancy (ALE) calculation and comparing that cost to the annual cost of $180 per SQL server. The Storage calculation is more complicated because it is based on transfer volume, the topic may need to be discussed with data custodians.

Key Vault

For this option Azure Defender looks for signs of malicious activity like high volume of key vault operations, unusual key vault access patterns, and key vault activity from a known TOR node.

This option has the same issues as Storage where it uses transaction volume to determine the cost. The topic may need to be discussed with a data custodian and other security admins because secrets are a sensitive security issue.

Other

Azure Security Center is releasing new features in Azure Defender regularly and while they are in preview Azure users get the opportunity to try them for free.

Despite the label saying “free” the alerts generated by the preview feature may take up the time of security analysts unnecessarily if they are not working as intended. It is up to security admins to determine if the value from preview features is worth the unintended costs.

We will continue to share best practices and lessons learned in future posts on Azure Defender in customer environments. When customers enable features like Azure Defender, our job as a VSOC becomes easier, but that should not come at the unnecessary expense of our customers.

In closing, consider these three questions when determining if using Azure Defender in your organization is worth the cost:

  1. Is there an accurate Annual Loss Expectancy (ALE) calculation that we can compare to Azure Defender costs?
  2. How best to engage with business and IT stakeholders to help quantify the cybersecurity risk of cloud resources?
  3. How can we effectively communicate and justify the budget needed to enable Azure Defender for our cloud resources?

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