Secure Email Access on Unmanaged Devices

A Zero Trust policy in M365 is a security model that enforces strict verification for every user, device, and application attempting to access resources, regardless of their location. It ensures that trust is never assumed, even inside the network perimeter. Microsoft 365 integrates Zero Trust principles across its suite of services, using Microsoft Entra, Microsoft Defender, and compliance tools. Brief Breakdown 👇 1. Verify Identity: Conditional Access & MFA - Multi-Factor Authentication : Require MFA for all users to add an extra layer of identity verification. - Conditional Access Policies: - Block risky sign-ins. - Enforce location-based restrictions. - Allow access only from compliant or managed devices. - Use Identity Protection in Microsoft Entra to detect and remediate identity risks. 2. Secure Devices: Endpoint Management - Use Microsoft Intune to manage and enforce compliance policies for devices. - Ensure devices are: - Encrypted (BitLocker for Windows, FileVault for macOS). - Running up-to-date antivirus software (Microsoft Defender). - Patched with the latest updates. - Enforce Conditional Access based on device compliance status. 3. Secure Applications: Limit Access & Enforce Policies - Restrict access to apps using Conditional Access App Control. - Use Microsoft Defender for Cloud Apps to: - Monitor and control app usage (Shadow IT discovery). - Enforce real-time session controls for risky activities. 4. Secure Data: DLP & Encryption - Implement DLP policies to: - Prevent sharing sensitive information like financial data or PII outside the organization. - Monitor and restrict access to sensitive documents. - Use Microsoft Purview Information Protection to classify, label, and encrypt data. - Enable email encryption for sensitive communication. 5. Monitor and Respond to Threats: Defender Suite - Enable Microsoft Defender for Endpoint and Defender for Office 365 to detect, investigate, and respond to threats. - Use Microsoft Sentinel (SIEM/SOAR) for centralized monitoring and automated threat response. - Regularly review security reports in the Microsoft 365 Defender portal. 6. Segment and Limit Access: Least Privilege - Adopt a least-privilege access model: - Assign roles in Microsoft Entra and Microsoft 365 with minimum permissions required. - Use Privileged Identity Management to manage elevated access and enforce just-in-time access. 7. Educate Users: Security Awareness - Regularly train employees on phishing and social engineering threats using Microsoft Defender Attack Simulation Training. - Enforce usage of strong, unique passwords combined with passwordless options like Windows Hello or FIDO2 keys. 8. Apply Continuous Assessment and Automation - Leverage Microsoft Secure Score to assess and improve your organization's security posture. - Automate remediation for identified risks using Microsoft Entra Identity Protection and Defender. #zerotrust #security #cybersecurity #M365security #microsoft

🔍 What is Microsoft Intune? Microsoft Intune is a cloud-based service that falls under Microsoft Endpoint Manager. It helps organizations manage: Devices (MDM – Mobile Device Management): Manage Windows PCs, macOS, iOS, and Android devices. Enforce security policies like encryption, PIN codes, and antivirus. Control which devices can access corporate resources (like email or SharePoint). Applications (MAM – Mobile Application Management): Manage company apps without taking full control of a personal device. For example, IT can secure Outlook or Teams on an employee’s phone, but not touch personal apps like WhatsApp or Photos. Apply policies like “you can’t copy/paste company data into personal apps.” Conditional Access & Security: Works with Azure Active Directory (AAD) to allow access only if the device is compliant. Example: If your laptop doesn’t have BitLocker enabled, you can’t log in to company email. BYOD (Bring Your Own Device) Enablement: Employees can use their own devices, while IT ensures only company data is protected. 🚀 Why Intune matters for modern businesses? Supports remote and hybrid work securely. Reduces risk of data breaches. Gives employees freedom and productivity without compromising company security. Integrated with Microsoft 365 and Defender for Endpoint for a full Zero Trust Security model. 💼 LinkedIn Post Example: 🌐 Work from anywhere, but stay secure everywhere! With the rise of Remote Work and BYOD (Bring Your Own Device), companies face a huge challenge: 👉 How do you protect sensitive data while keeping employees productive and flexible? This is where Microsoft Intune comes in: 🔹 Mobile Device Management (MDM) – Secure and manage corporate & personal devices. 🔹 Mobile Application Management (MAM) – Protect corporate apps and data without controlling the whole device. 🔹 Conditional Access – Only compliant devices get access. 🔹 Seamless integration with Microsoft 365 & Azure AD. The result? 🔒 Strong security + 🚀 empowered employees. #Microsoft #Intune #CyberSecurity #ZeroTrust #MDM #MAM #CloudSecurity #ITManagement #RemoteWork #Productivity

Want to keep Russian threat actors out of your M365 tenant? Good, me too. Go uncheck this box immediately in your settings. Unfortunately, M365 is not fully secure or hardened out of the box. By default, any user can create app registrations and consent to Graph permissions. Here is some other guidance to level-up your defenses: ☑️ Audit all user and service principal identities in your tenant using Microsoft Graph Data Connect to assess their privilege levels. Scrutinize privileges more closely if they belong to unknown identities, are no longer in use, or exceed necessary levels, especially for apps with app-only permissions that might have over-privileged access. ☑️ Review identities with ApplicationImpersonation privileges in Exchange Online. This feature allows a service principal to perform actions on behalf of a user, like managing a mailbox. Check permissions in the Exchange Online Admin Center or via PowerShell to ensure they are appropriately scoped and not overly broad. ☑️ Utilize anomaly detection policies to identify and address malicious OAuth apps in Exchange Online. Investigate and remediate any risky OAuth apps that perform sensitive administrative activities. ☑️ Implement conditional access app control for users on unmanaged devices. Be vigilant of OAuth application abuse, particularly those with EWS.AccessAsUser.All and EWS.full_access_as_app permissions, and remove any unnecessary permissions. ☑️ For applications requiring mailbox access, use role-based access control in Exchange Online to ensure granular and scalable access. This model allows applications to access only the specific mailboxes they need, enhancing security.