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Glossary

XDR (Extended Detection and Response): Meaning, Features and Differences

What is XDR? Extended detection and response explained simply: data sources, how it works, XDR vs. EDR and SIEM, native vs. open XDR, benefits and limits.

Definition: Extended detection and response (XDR) is a security approach that brings together data from several areas such as endpoints, email, network, cloud and identities, analyzes it jointly and allows a central response to detected attacks.

What Is XDR?

XDR stands for extended detection and response. "Extended" means more data sources. While EDR only monitors endpoints, XDR looks beyond them.

A picture: EDR is a camera in every room. XDR links all cameras, access control and the alarm system into one control room. There, you see what happens in each room and how someone moves through the whole building.

The term appeared in 2018. Since then, many security vendors have offered XDR solutions.

Which Data Sources XDR Links

  • Endpoints: laptops, PCs, servers and mobile devices, usually via an EDR agent.
  • Email: incoming phishing emails, dangerous attachments and links.
  • Network: traffic and odd connections, for example via network detection and response (NDR) or a firewall.
  • Cloud: activity in cloud services and cloud infrastructure.
  • Identities: sign-ins, changed rights and odd behavior of user accounts.

How XDR Works

  1. Collect: sensors in all areas send data to a central platform.
  2. Link: single events are joined into one case. Ten small alerts become one clear story of the attack.
  3. Detect: rules, behavior analysis and threat intelligence show what is dangerous.
  4. Respond: steps are taken from one place, often on their own: cut a device off, delete an email from all mailboxes, block an account.

An example: an employee opens an attachment from a phishing email. Her laptop then connects to an unknown server, and shortly after, her account signs in to a cloud service from another country. On their own, the three events look harmless. XDR sees the link, isolates the laptop, blocks the account and removes the email from colleagues' mailboxes too.

XDR, EDR, SIEM and SOAR

  • EDR: detection and response on endpoints.
  • XDR: detection and response across several areas, with ready-made rules and links.
  • SIEM: collects logs from a great many sources, correlates them and keeps them for a long time. Also important for compliance.
  • SOAR: security orchestration, automation and response automates workflows between different security tools.

The lines are blurring. Many XDR solutions include SIEM and SOAR features, and many SIEM solutions offer XDR-like detection.

Native XDR and Open XDR

  • Native XDR: all parts come from one vendor. This is easier to set up, but ties you to one firm.
  • Open XDR (hybrid): tools from other vendors are also linked in. This is more flexible and keeps what you already paid for, but needs more work to set up.

Benefits

  • The full picture: attacks become visible across all areas.
  • Fewer alerts: linked incidents instead of many single messages.
  • Faster response: countermeasures from one place, often automatic.
  • Less strain on the team: less jumping between different screens.

Limits and Challenges

  • Vendor lock-in: with native XDR in particular, you depend heavily on one provider.
  • Vague term: "XDR" is used very differently in marketing. Check which sources are really connected.
  • People are still needed: XDR also needs experts who rate incidents and maintain rules.
  • Data protection: collecting a lot of data in one place needs clear rules on who may see it, why, and for how long.

What to Look for When Choosing

  • Sources: which areas are really connected, and which only through add-on products?
  • Openness: can you connect existing tools from other vendors, such as your firewall or your SIEM?
  • Data storage: where is the collected data stored, and for how long?
  • Automation with control: which countermeasures run on their own, and where does a person decide?
  • Operations: who rates incidents around the clock, your own team or a service provider?
  • Costs: is it billed by device, user or data volume, and what does growth cost?

It is best to start with the areas most attacks come through: endpoints, email and user accounts. Other sources can then be added step by step.

XDR in a Managed SOC

Mid-sized companies in particular rarely have their own team to rate alerts around the clock. The SecTepe security operations center works around the clock with its own team. It uses the protection software (EDR or XDR) you already run and brings its own analysis platform. For endpoints, there is also our own EDR solution, SecTepe Endpoint.

Conclusion

XDR extends EDR with data from email, network, cloud and identities. This makes attacks visible that span several areas, and lets you stop them centrally. But XDR does not replace experts. What matters is that someone rates the linked incidents and acts quickly.

FAQ about Extended Detection and Response (XDR)

What is XDR in simple terms?

XDR stands for extended detection and response. It collects security data from computers and servers and also from email, network, cloud and user accounts. This data is linked so that attacks spanning several areas can be spotted. The security team can then respond from one place.

What is the difference between XDR and EDR?

EDR only monitors endpoints. XDR includes other sources, such as email, network, cloud and identities. This way, the team sees the whole path of an attack, for example from the phishing email to the infected laptop to access to a cloud service.

What is the difference between XDR and SIEM?

A SIEM collects logs from a great many sources, analyzes them and keeps them for a long time, also as compliance proof. XDR focuses on detecting attacks and responding to them, with ready-made rules and automatic countermeasures. In many companies, the two work together.

What do native XDR and open XDR mean?

Native XDR comes from a single vendor and links its own products, such as EDR, email protection and firewall. Open XDR, also called hybrid XDR, also connects products from other vendors via interfaces. Native XDR is usually easier to set up, open XDR is more flexible.

Who needs XDR?

Above all, companies with many systems, cloud services and sites, where attacks can span several areas. What matters is that someone rates the alerts. Without an in-house team, a managed SOC can take on this task.

Where does the term XDR come from?

The term appeared in 2018 and was coined by the chief technology officer of a large security vendor. It describes the extension of EDR to further data sources.

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