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Cybersecurity has shifted dramatically. Traditional perimeter defenses such as firewalls and VPNs are no longer enough to protect a workforce that operates across devices, networks, and locations. Today, the endpoint the laptop, mobile device, or workstation has become the primary battleground. Attackers target users directly through phishing, malicious scripts, identity compromise, and lateral movement techniques that bypass legacy controls.

This shift is why Endpoint Security is now the foundation of Zero Trust.

Microsoft’s modern security ecosystem Defender for Endpoint, Intune, Entra Conditional Access, Network Protection, Web Content Filtering, Purview DLP, and Entra Internet Access provides a unified, real time defense that protects devices, identities, networks, and data wherever work happens.

In this blog, we explore how these capabilities work together to deliver a layered, Zero Trust aligned endpoint and network security strategy that:

• Reduces attack surface through hardened configurations
• Detects and blocks malicious behavior directly on the device
• Ensures only healthy, compliant devices can access corporate resources
• Controls internet and private app access using identity‑aware network filtering
• Prevents sensitive data from being copied, shared, or uploaded in unsafe ways
• Provides unified visibility across endpoint, network, and data activity

STEP 1: Harden the Endpoint (ASR, Network Protection, Web Filtering)

Enable Attack Surface Reduction (ASR) Rules

Where to go: Intune Admin Center → Endpoint Security → Attack Surface Reduction → Create Policy

Configure:

• Block executable content from email/webmail

• Block credential stealing from LSASS

• Block Office macros

• Block ransomware behavior

Also add these two additional steps that helps a lot in blocking processes created through PsExec and WMI from running

And preventing unsigned or untrusted scripts (such as VBScript, JavaScript) and executables (such as .exe, .dll, .scr files) from removable USB drives, including attached SD cards, from running.

Enable Network Protection

Where to go: Intune → Endpoint Security → Antivirus → Create Policy

Configure:

• Network Protection: Enabled – Block mode

Enable Web Content Filtering

Where to go: Microsoft Defender Portal → Settings → Endpoints → Web Content Filtering

Configure:

• Enable categories:
  • High‑risk
  • Adult content
  • Malware sites
  • Untrusted domains

STEP 2 : Enforce Device Compliance (Defender Health Requirements)

Where to go:

Intune → Devices → Compliance Policies → Create Policy → Windows 10/11

Prevent execution of untrusted or malicious applications.

Capabilities:

• Allow‑listing approved apps
• Blocking unknown EXEs, DLLs, scripts
• Preventing execution of unsigned binarie

STEP 3 : Conditional Access Based on Device Health

Where to go:

Entra Admin Center → Protection → Conditional Access → New Policy

Configure:

• Assign: All users or demo group
• Cloud apps: All apps or specific apps
• Grant: Require Compliant device
• Session: Block access if device risk ≥ Medium

Step 4 : Network Isolation (Defender for Endpoint)

Also make sure the device isolation is enabled. Isolation only works on devices that are fully onboarded in Intune. If the device is not onboarded isolation option will not appear. And the devices must have the Defender for Endpoint sensor running.

Capabilities:

• Full device isolation
• Selective isolation
• Blocking outbound connections
• Restricting risky IP ranges

Step 5: Entra Internet Access (EIA protects outbound internet traffic using identity aware controls.)

Capabilities:

• Secure web gateway (SWG)
• DNS filtering
• URL filtering
• Malware inspection
• Conditional Access for internet traffic
• Integration with Defender for Endpoint signals

Where to go: Entra Admin Center → Global Secure Access → Internet Access

Can also create the web content filtering policies here much more actionable with granular controls

For example there is also MCP Policies in preview which we can effectively utilize to make sure which MCP Gateways can be allowed from the endpoints

Also SSE provides unified visibility across:

• Endpoint signals
• Internet traffic
• Private app access
• Conditional Access decisions

Traffic logs preview is a great option

Step 6 : Purview Endpoint DLP (Data Protection)

Create an endpoint DLP rule for USB copy restriction and copy to network share

Few other options to consider based upon your business requirement.

There are very good options which can think of enabling and targeting them to people dealing with sensitive data

Can also add options to manage protected files access from unallowed browsers.

This setting protects sensitive files after they leave the original application meaning even if a user downloads a file locally, Endpoint DLP still controls what they can do with it.

By hardening devices with ASR rules, enforcing network protection, filtering unsafe web content, validating device health, and applying conditional access, organizations ensure that only secure and compliant endpoints can access corporate resources. Purview Endpoint DLP adds another layer of protection by controlling how sensitive files are handled even after they are downloaded preventing unauthorized copying, sharing, or uploading to risky cloud services.

Together, these capabilities transform endpoint security from a reactive control into a proactive, continuous enforcement system. They stop threats early, block unsafe behaviors, restrict risky access, and protect sensitive information across devices and networks.

This approach transforms endpoint security from a reactive control into a proactive, continuous enforcement system. It stops threats early, blocks unsafe behaviors, restricts risky access, and protects sensitive information across devices and networks. In a world where attackers target users directly, this layered, Zero Trust‑aligned strategy is essential.

Modern endpoint security is not just a technical requirement it is a business imperative. And with Microsoft’s integrated security stack, organizations gain the visibility, control, and protection needed to stay ahead of evolving threats

As organizations mature, additional capabilities such as Information Rights Management (IRM), sensitivity labels, insider risk policies, and advanced data governance can be layered on top to further strengthen protection and ensure end to end data security.

Sathish Veerapandian