SIEM—Security Information and Event Management—is a set of integrated tools that work together to detect, log, analyze, and often respond to security vulnerabilities, incidents, and hostile security penetrations. When everything is working correctly, a well-architected SIEM system automates the routine aspects of your organization's digital and internet security thousands of times faster than any human security expert could. 

If it detects a threat, the SIEM can support preliminary steps to stop any bad action and flag security holes for human attention. When human analysts log into the system, just a few moments later, they already have a head start, guided by intelligent, automated triage.

A typical SIEM workflow follows these three steps:

1. Log ingestion

The SIEM pulls in and reads logs from your firewall, IDS/IPS, web filters, routers and switches, servers, and any other security infrastructure it can get its packets into. 

2. Event analysis

It looks at the event data and its context and decides whether to output a standard report or an immediate security alert. 

3. Automated response

Finally, some SIEM systems are advanced enough to take basic, remedial action automatically, before the alerted security people have time to respond. An example would be blocking an IP or isolating a device.

SIEM architecture is, or should be, the backbone of your organization’s security strategy. It’s a carefully orchestrated framework of both hardware and software aimed at collecting, analyzing, storing, and responding to security-relevant data, allowing for real-time detection and incident response. 

SIEM components

Most SIEM architectures have four main components:

• Ingestion layers: These are log collectors, agents, and cloud APIs that gather data from security tools and systems. This includes telemetry, contextual metadata, and large volumes of unrelated data.  

• Parsing, normalization, and enrichment: These components filter and refine raw data, turning messy logs into searchable events that can be analyzed effectively.

• Correlation engine and real-time analytics: This is where the intelligence happens. These systems use rule-based logic and ML to identify actual problems and vulnerabilities and bring them to your attention.

In a nutshell, there are three main types of SIEM architectures on the market today. 

Cloud-based SIEM

This type of SIEM architecture is deployed on a remote server and offered as a service. It’s scalable and fast to deploy, but your operations are not overseen by a human team. Sometimes this is plenty for a small business, but most will grow out of it quickly.

On-premises SIEM

This SIEM architecture is deployed entirely on your own infrastructure. It’s a good approach for very sensitive data, and when an SLA mandates that the data never leave your site. The tradeoff? It does mean you need to train and maintain an in-house security team around the clock.

Hybrid SIEM

A hybrid SIEM architecture combines both on-premises and cloud-based elements. It lets organizations keep sensitive data on-site while using cloud resources for advanced analytics, storage, and scalability, providing a balance between control, flexibility, and performance. This makes it a popular choice for growing organizations.

At first glance, a Security Operations Center (SOC) may sound a great deal like a managed SIEM team, but it actually has a broader, more comprehensive function. A SOC is a centralized facility staffed with analysts, engineers, threat hunters, and incident responders who manage the entire security posture of an organization. 

It’s true that your SIEM system, or team, can reside within the SOC. The SOC uses the SIEM to gain increased visibility across your environment, enhance threat detection, and help reduce false positives. Together, the SIEM and SOC allow for faster, more accurate incident response and a more comprehensive security posture.

Huntress Managed SIEM is more than just an AI-powered rapid response SIEM package. It’s backed by some of the best (human) analysts in the field today. This lets you focus your top talent on your primary business goals, where it belongs.