Endpoint Detection and Response Solutions

For decades, endpoint security meant antivirus: a database of known-malicious file signatures compared against everything that ran. That model is now routinely bypassed.

Attackers stopped bringing files

Modern intrusions increasingly avoid dropping a detectable malware file at all. Adversaries operate fileless — executing code in memory, abusing PowerShell, WMI, and scripting engines, and using stolen credentials to move through the environment. Signature scanners see nothing to match.

Living off the land

Rather than importing tools, attackers use the legitimate administrative utilities already present on the system — the same binaries administrators use every day. A signature cannot distinguish malicious use of a trusted tool from legitimate use; only behavior can.

The visibility problem

Even when antivirus blocks something, it typically records only that one event. It cannot tell you how the attacker got in, what they touched, whether they moved laterally, or whether they are still present. Responders are left reconstructing an incident with almost no evidence.

The question that matters is no longer only "did we block it?" but "what happened on this machine, and is the attacker still here?" Antivirus cannot answer that. EDR is built to.

EDR does not discard prevention — it layers continuous recording, behavioral analytics, and response capability on top of it.

At its core, EDR is a lightweight agent on every endpoint that continuously records activity and streams it to an analytics platform where behavioral detection runs.

The telemetry backbone

The agent captures a rich event stream:

• Process execution — what ran, spawned by what, with which command line.
• File and registry activity — creation, modification, and deletion of sensitive objects.
• Network connections — where the endpoint communicated and over what protocols.
• Authentication and account activity — logons, privilege use, and account changes.

From events to detections

This stream is analyzed for patterns that indicate malice: a document spawning a scripting engine that then reaches out to the internet; a burst of file encryption consistent with ransomware; credential-dumping access to protected memory. Behavioral analytics and machine learning flag these sequences even when no individual action is inherently malicious.

The recorded history

Because EDR retains the event history, responders can travel back in time across an incident — reconstructing the full chain from initial execution to current state. This forensic record is what transforms an alert into an actionable investigation, and it is exactly what antivirus never provided.

Raw alerts are noise until they are organized around how adversaries actually operate. The MITRE ATT&CK framework provides that structure.

A shared language for attacker behavior

ATT&CK catalogs the tactics and techniques adversaries use across the intrusion lifecycle — initial access, execution, persistence, privilege escalation, credential access, lateral movement, exfiltration, and impact. Mapping each EDR detection to an ATT&CK technique tells you not just that something fired, but where in the attack the adversary is.

Measuring coverage, exposing gaps

• Which techniques does your EDR reliably detect?
• Which are visible in telemetry but not yet alerting?
• Which are blind spots requiring new detection logic or additional data sources?

Mapping detections to ATT&CK turns "we have EDR" into a measurable picture of exactly what your program can and cannot see.

Driving threat hunting

ATT&CK also guides proactive hunting. Rather than waiting for an alert, analysts hypothesize how an adversary might operate against your environment — a specific credential-access or lateral-movement technique — and query the EDR telemetry for evidence. GuardsArm's threat detection teams use ATT&CK both to validate EDR coverage and to structure hunts against the techniques most relevant to each client.

Detection without response is just an expensive alarm. The "R" in EDR is what lets defenders act on what they find, immediately and remotely.

Isolate first

The most important response action is network isolation — cutting a compromised endpoint off from the rest of the environment while keeping the EDR agent connected for investigation. This severs the attacker's reach and halts lateral movement and ransomware spread without powering the machine off and destroying evidence.

Investigate and remediate remotely

• Kill malicious processes and quarantine files across affected endpoints.
• Retrieve forensic artifacts — memory, files, logs — without physical access.
• Remove persistence mechanisms the attacker established.
• Roll back ransomware-encrypted files where the platform supports it.

Automate the routine, escalate the rest

Mature programs automate low-risk containment — auto-isolating an endpoint on a high-confidence ransomware detection — while routing ambiguous cases to analysts. This balance stops fast-moving attacks in seconds while avoiding disruptive false-positive isolations.

The window between initial compromise and lateral movement can be minutes. Response that requires a technician to walk to a desk loses that race. Remote, immediate containment wins it.

EDR delivers value only when it is deployed comprehensively and configured deliberately. Partial coverage leaves exactly the gaps attackers seek.

Achieve full coverage

An unmonitored endpoint is a blind spot. Servers, remote laptops, virtual desktops, and cloud workloads all need agents. Reconcile EDR enrollment against your asset inventory continuously — the machine without an agent is the one the attacker will use.

Tune to reduce noise

Out of the box, any EDR generates false positives against your unique mix of legitimate software and administrative activity. A tuning period — building exclusions for known-good behavior while preserving detection fidelity — is essential so analysts trust the alerts and are not buried in noise.

Integrate with the broader stack

• Forward EDR detections to the SIEM to correlate with network, identity, and cloud events.
• Feed threat intelligence so new indicators trigger retroactive searches across recorded history.
• Connect to response orchestration for consistent, repeatable containment.

Plan for the endpoint you do not control

Contractor devices, legacy systems that cannot run an agent, and unmanaged hardware need compensating controls — network segmentation or brokered access — rather than exemptions that quietly become the weakest link.

The most common EDR failure is not technical — it is operational. Organizations buy the platform and discover that alerts arrive around the clock, requiring skilled analysts who are always available.

Alerts do not respect business hours

Adversaries deliberately strike nights, weekends, and holidays, when in-house teams are thin. An EDR that detects a ransomware precursor at 3 a.m. only helps if someone is watching and empowered to isolate the host immediately.

The skills and staffing reality

Investigating EDR alerts requires expertise in attacker tradecraft, forensics, and the platform itself. Retaining a team large enough to cover 24/7 shifts is beyond the reach of most organizations, and alert fatigue erodes even well-staffed teams.

Managed Detection and Response

MDR pairs the EDR technology with a security operations team that monitors, triages, hunts, and responds on the organization's behalf around the clock. The organization gets enterprise-grade detection and response without building a 24/7 SOC from scratch.

EDR is a capability, not an outcome. The outcome — threats caught and contained fast — depends on someone operating it continuously and skillfully.

Where GuardsArm fits

GuardsArm deploys, tunes, and operates EDR as a managed service — providing continuous monitoring, ATT&CK-driven threat hunting, and rapid containment, with our incident response team ready when a detection becomes a full-scale event.