Azure Security Center (ASC) is a great holistic solution provided by Microsoft to not only assess your Azure resources, but can also be extended to your On-Premises infrastructure as well. ASC is a security management solution that improves your overall security posture within your Azure environment and on-premises infrastructure. I work with a lot of customers where they require an “agnostic” SIEM solution, so they don’t have all of their eggs in one basket (sort of speak) with a single vendor. Azure Sentinel is a great solution, but still lacks maturity in comparison to other products like IBM’s QRadar, Splunk and some others.
ASC also generates detailed security recommendations and alerts that can be viewed through the ASC portal. However when customers have a requirement to send this telemetry to some third party SIEM, Azure’s Event Hubs is a great middleman solution.
In short, your Azure resources can send their security events directly to Event Hubs (via Diagnostic Agents) or can be configured (the easier approach) with ASC. Choosing the latter, we can also configure ASC to Continuously Export the data being collected in ASC to be forwarded to Event Hubs. Which in turn will allow the third party SIEM to ingest the data within Event Hubs.
Once you have enabled ASC, enrolled your resources, (assuming you have already configured Event Hubs and a third party SIEM) you can then setup Continuous Export within the ASC console as shown below.
Setting up ASC Continuous Export is pretty straightforward, provided you have already configured Event Hubs, and your SIEM to ingest from Event Hubs. Within ASC, select Continuous Export. Enable which workspace to send the data to, either Event Hubs, or Log Analytics (Sentinel). Select the type of alerts and recommendations (All, Low, Medium, High). Specify the Subscription where Event Hubs lives, the Event Hub Namespace, Name, and Policy Name. Hit Save, and that is it!
That is, pretty simple. Definitely a much easier solution than deploying Linux and Windows Agent Diagnostic (LAD/WAD) — another post for another day 🙂