Extended Detection & Response (XDR)
Unify telemetry across endpoint, identity, email, cloud, and network so a single intrusion reads as one story - not five unrelated alerts sitting in five different consoles.
Extended Detection and Response (XDR) is a security architecture that correlates telemetry from endpoint, identity, email, cloud, and network into a single detection model - so an attack that touches five systems is seen as one incident instead of five disconnected alerts.
The problem XDR solves is not a shortage of security tools. It is that each tool sees one slice of the attack and calls it a day. Your EDR sees the endpoint. Your email gateway sees the message. Your identity provider sees the login. Each one evaluates its own slice, finds nothing individually alarming, and stays quiet. Nobody sees the intrusion, because the intrusion does not live inside any single tool's field of view.
Consider a real chain. A user clicks a phishing link - the email gateway logs a delivered message that was not yet known-bad. The attacker steals a session token and replays it - the identity provider logs a successful sign-in with valid credentials and a satisfied MFA claim. From that session the attacker creates a mailbox rule, enumerates SharePoint, and pivots to a second account - the endpoint never runs a single malicious binary, so the EDR has nothing to say. Four systems each saw one unremarkable event. Correlate them and the story assembles itself: delivery, token theft, persistence, lateral movement. That correlation is what XDR is.
Telemetry we correlate
Endpoint
Process execution, persistence mechanisms, and EDR detections. Contributes the "what ran on the machine" half of the story - the payload, the child process, the scheduled task left behind.
Identity
Sign-in events, token abuse, impossible travel, MFA fatigue, and privilege changes. Contributes the "who authenticated and from where" - often the first signal in an attack that never drops a file.
Phishing delivery, malicious attachments and links, and mailbox rule creation. Contributes the entry point and the attacker's attempt to hide replies from the real user.
Cloud & SaaS
Microsoft 365 and Azure configuration, OAuth consent grants, and access changes. Contributes the "what did they touch after they were in" - data access, app registrations, conditional access edits.
Network
Egress traffic, DNS, and C2 beaconing patterns. Contributes the outbound half of the picture - the callback that confirms an endpoint alert was a real foothold, not a false positive.
EDR vs. XDR vs. MDR
These three terms get used interchangeably in marketing, and they should not be. EDR is a tool, XDR is an architecture, and MDR is a service. They sit at different layers of the stack, and an organization can reasonably have all three.
| EDR | XDR | MDR | |
|---|---|---|---|
| What it is | A tool that monitors and responds on endpoints. | An architecture that correlates telemetry across layers into one detection model. | A managed service: analysts, process, and response operating your detection stack. |
| Scope | Endpoints only - laptops, servers, workstations. | Endpoint, identity, email, cloud, and network, correlated together. | Whatever the service is scoped to cover, operated end to end. |
| Who operates it | Your team. | Your team, or a provider on your behalf. | SOClogix analysts, 24/7. |
| Best for | Deep endpoint visibility and containment. | Seeing a multi-layer attack as one incident instead of scattered alerts. | Organizations without a 24/7 in-house SOC. |
Frequently asked questions
What is XDR?
Extended Detection and Response (XDR) is a security architecture that correlates telemetry from endpoint, identity, email, cloud, and network into a single detection model - so an attack that touches five systems is seen as one incident instead of five disconnected alerts.
What is the difference between XDR and MDR?
XDR is the architecture and technology: the correlated data model that lets a detection reason across endpoint, identity, email, cloud, and network at once. MDR is the managed service that operates it: the analysts, the process, and the response. They answer different questions. You can buy XDR tooling and still have nobody watching it at 2 AM, which is the gap MDR fills.
What is the difference between EDR and XDR?
EDR covers the endpoint only - process execution, persistence, and containment on the machine itself. XDR extends that scope by correlating endpoint signals with identity, email, cloud, and network telemetry, so a detection can be built from evidence that spans layers rather than from one sensor in isolation.
Do we need XDR if we already have EDR?
EDR is necessary but not sufficient. A large share of modern intrusions never touch the endpoint in an obvious way: stolen session tokens replayed from an attacker device, OAuth consent abuse against a SaaS app, mailbox rules that hide the attacker's replies, or cloud configuration changes made through a browser. Your EDR sees none of that. XDR adds the layers where those attacks actually happen.
Does SOClogix provide XDR or MDR?
Both, and they are not alternatives. Our Managed Detection and Response service is built on a correlated XDR telemetry model - the architecture described on this page is what our analysts operate on. Most clients want the managed outcome rather than the architecture on its own, so they engage us for MDR and get the correlated model as part of it.
What telemetry does XDR need?
At minimum: endpoint, identity, email, cloud and SaaS, and network. The value scales with breadth. Each additional layer is not just more data - it is more cross-layer correlations that become possible, which is where detections that no single tool could produce come from. An XDR fed only endpoint data is an expensive EDR.
Looking for something else?
This page covers the XDR architecture: what correlated telemetry is and how detections span layers. If what you actually want is the managed 24/7 service that operates it - analysts investigating, triaging, and containing on your behalf - see Managed Detection & Response. That is where most conversations end up, and the two are complementary: our MDR service runs on the correlated model described here.
See what your tools are missing
We map the telemetry you collect today against the layers an attacker actually moves through, and show you the correlations your current stack cannot make.
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