What is an EDR?

An EDR (Endpoint Detection and Response) is a cybersecurity technology dedicated to monitoring and protecting the endpoints of an information system: workstations, servers, virtualized environments, or mobile devices.
Its purpose is to identify suspicious behavior, block attacks, and support incident response through full visibility into endpoint activities.

Unlike traditional antivirus software, which is limited to known signature detection, EDR relies on behavioral analysis and real-time correlation to detect weak signals often invisible to conventional solutions.

Why EDR has become indispensable

Modern cyber threats, such as ransomware, fileless attacks (fileless attacks), or credential theft, easily bypass perimeter defenses.
In this context, EDR has become an essential pillar of operational security, as it acts directly on critical assets: the endpoints themselves.

The main benefits of an EDR solution are:

• Behavioral detection: identification of anomalies in processes, network connections, or file access.

• Rapid incident response: isolation of a compromised endpoint to limit lateral movement.

• Centralized visibility: real-time event collection and analysis across the entire fleet.

• Evidence preservation: comprehensive logging of actions for investigation and compliance.

EDR thus transforms endpoint security into an intelligent, responsive alerting system capable of intervening at the earliest signs of intrusion.

How does an EDR work?

EDR relies on a lightweight agent installed on each endpoint, responsible for collecting system events (processes, connections, files, registries, etc.).
This data is then sent to a centralized analysis console, often connected to a SOC (Security Operations Center) or a SIEM.

The operation is based on three key steps:

1. Collection and correlation: continuous aggregation of events from endpoints.

2. Advanced detection: identification of anomalous activity using behavioral analysis algorithms and artificial intelligence.

3. Automated or guided response: isolation, removal of malicious files, or remediation assistance by a SOC analyst.

Some EDR solutions also include threat hunting capabilities, allowing research teams to proactively track down malicious behavior within the IT environment.

EDR, XDR, MDR: what are the differences?

• EDR: focuses on endpoint protection (workstations and servers).

• XDR (Extended Detection and Response): extends visibility to other layers (emails, cloud, networks, identities).

• MDR (Managed Detection and Response): combines EDR or XDR technology with a managed service operated by a SOC for 24/7 detection.

At ITrust, these approaches are complementary.
Our experts combine EDR technology with real-time human supervision via the ITrust SOC, providing comprehensive detection coverage tailored to each environment.

Concrete benefits of EDR

A well-deployed EDR delivers significant cybersecurity gains:

• Reduction in mean time to detect (MTTD) and mean time to respond (MTTR).

• Enhanced visibility into internal and external activities.

• Prevention of lateral movement across the network.

• Strengthened regulatory compliance (GDPR, ISO 27001, NIS2).

• Enhanced support for forensic investigations.

Beyond technology, the analytical expertise and responsiveness of the teams dictate the effectiveness of the response. This is why ITrust integrates EDR into an end-to-end approach of continuous monitoring and active defense.