Security alerts in Azure Security Center
In Azure Security Center, there are a variety of alerts for many different resource types. Security Center generates alerts for resources deployed on Azure, and also for resources deployed on on-premises and hybrid cloud environments.
Advanced detections are available in the Standard Tier of Azure Security Center. A free trial is available. You can upgrade from the Pricing Tier selection in the Security Policy. Visit Security Center page to learn more about pricing.
There have been significant changes in the threat landscape over the last 20 years. In the past, companies typically only had to worry about web site defacement by individual attackers who were mostly interested in seeing “what they could do". Today’s attackers are much more sophisticated and organized. They often have specific financial and strategic goals. They also have more resources available to them, as they may be funded by nation states or organized crime.
These changing realities have led to an unprecedented level of professionalism in the attacker ranks. No longer are they interested in web defacement. They are now interested in stealing information, financial accounts, and private data – all of which they can use to generate cash on the open market or to leverage a particular business, political, or military position. Even more concerning than those attackers with a financial objective are the attackers who breach networks to do harm to infrastructure and people.
In response, organizations often deploy various point solutions, which focus on defending either the enterprise perimeter or endpoints by looking for known attack signatures. These solutions tend to generate a high volume of low fidelity alerts, which require a security analyst to triage and investigate. Most organizations lack the time and expertise required to respond to these alerts – so many go unaddressed.
In addition, attackers have evolved their methods to subvert many signature-based defenses and adapt to cloud environments. New approaches are required to more quickly identify emerging threats and expedite detection and response.
What are security alerts?
Alerts are the notifications that Security Center generates when it detects threats on your resources. Security Center prioritizes and lists the alerts, along with the information needed for you to quickly investigate the problem. Security Center also provides recommendations for how you can remediate an attack.
Microsoft security researchers are constantly on the lookout for threats. Because of Microsoft’s global presence in the cloud and on-premises, they have access to an expansive set of telemetry. The wide-reaching and diverse collection of datasets enables the discovering of new attack patterns and trends across its on-premises consumer and enterprise products, as well as its online services. As a result, Security Center can rapidly update its detection algorithms as attackers release new and increasingly sophisticated exploits. This approach helps you keep pace with a fast moving threat environment.
To detect real threats and reduce false positives, Security Center collects, analyzes, and integrates log data from your Azure resources and the network. It also works with connected partner solutions, like firewall and endpoint protection solutions. Security Center analyzes this information, often correlating information from multiple sources, to identify threats.
Security Center employs advanced security analytics, which go far beyond signature-based approaches. Breakthroughs in big data and machine learning technologies are leveraged to evaluate events across the entire cloud fabric – detecting threats that would be impossible to identify using manual approaches and predicting the evolution of attacks. These security analytics include:
- Integrated threat intelligence: Looks for known bad actors by leveraging global threat intelligence from Microsoft products and services, the Microsoft Digital Crimes Unit (DCU), the Microsoft Security Response Center (MSRC), and external feeds.
- Behavioral analytics: Applies known patterns to discover malicious behavior.
- Anomaly detection: Uses statistical profiling to build a historical baseline. It alerts on deviations from established baselines that conform to a potential attack vector.
The following topics discuss each of these analytics in further detail.
Integrated threat intelligence
Microsoft has an immense amount of global threat intelligence. Telemetry flows in from multiple sources, such as Azure, Office 365, Microsoft CRM online, Microsoft Dynamics AX, outlook.com, MSN.com, the Microsoft Digital Crimes Unit (DCU) and Microsoft Security Response Center (MSRC). Researchers also receive threat intelligence information that is shared among major cloud service providers and subscribes to threat intelligence feeds from third parties. Azure Security Center can use this information to alert you to threats from known bad actors.
Behavioral analytics is a technique that analyzes and compares data to a collection of known patterns. However, these patterns are not simple signatures. They are determined through complex machine learning algorithms that are applied to massive datasets. They are also determined through careful analysis of malicious behaviors by expert analysts. Azure Security Center can use behavioral analytics to identify compromised resources based on analysis of virtual machine logs, virtual network device logs, fabric logs, crash dumps and other sources.
In addition, there is correlation with other signals to check for supporting evidence of a widespread campaign. This correlation helps to identify events that are consistent with established indicators of compromise.
Azure Security Center also uses anomaly detection to identify threats. In contrast to behavioral analytics (which depends on known patterns derived from large data sets), anomaly detection is more “personalized” and focuses on baselines that are specific to your deployments. Machine learning is applied to determine normal activity for your deployments and then rules are generated to define outlier conditions that could represent a security event.
Continuous monitoring and assessments
Azure Security Center benefits from having security research and data science teams throughout Microsoft who continuously monitor for changes in the threat landscape. This includes the following initiatives:
- Threat intelligence monitoring: Threat intelligence includes mechanisms, indicators, implications and actionable advice about existing or emerging threats. This information is shared in the security community and Microsoft continuously monitors threat intelligence feeds from internal and external sources.
- Signal sharing: Insights from security teams across Microsoft’s broad portfolio of cloud and on-premises services, servers, and client endpoint devices are shared and analyzed.
- Microsoft security specialists: Ongoing engagement with teams across Microsoft that work in specialized security fields, like forensics and web attack detection.
- Detection tuning: Algorithms are run against real customer data sets and security researchers work with customers to validate the results. True and false positives are used to refine machine learning algorithms.
These combined efforts culminate in new and improved detections, which you can benefit from instantly – there’s no action for you to take.
The following topics guide you through the different alerts, according to resource types:
The following topics explain how Security Center uses the different telemetry that it collects from integrating with the Azure infrastructure, in order to apply additional protection layers for resources deployed on Azure:
What are security incidents?
A security incident is a collection of related alerts, instead of listing each alert individually. Security Center uses Cloud Smart Alert Correlation to correlate different alerts and low fidelity signals into security incidents.
Using incidents, Security Center provides you with a single view of an attack campaign and all of the related alerts. This view enables you to quickly understand what actions the attacker took, and what resources were affected. For more information, see Cloud smart alert correlation.
In this article, you learned about the different types of alerts available in Security Center. For more information, see: