Secure by default does not mean well configured
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Title: Hardening Microsoft 365: A Security Checklist for SMBs
Excerpt: Microsoft 365 is secure by default, but not secure enough. Here are the essential settings to close the doors attackers exploit most.
Body (plain text):
Microsoft 365 offers excellent security tools, but many sit dormant, switched off, in your admin console. The default configuration aims for ease of deployment, not maximum protection. Here are the settings that make the biggest difference.
The Essential Checklist
1. Enforce Multi-Factor Authentication Everywhere
On every account, no exceptions, starting with administrators. This is the most cost-effective measure you can take: it blocks the vast majority of fraudulent sign-in attempts, even when a password has leaked.
2. Configure Conditional Access
Block sign-ins from countries where you do no business, require a trusted device for sensitive access, and shut off the legacy authentication protocols that bypass MFA.
3. Disable Legacy Authentication
Old protocols like POP and IMAP ignore MFA, and attackers love them for it. If you don't use them, turn them off.
4. Review External Sharing
Check who can share files and folders externally in SharePoint and OneDrive. An "anyone with the link" setting left open is a data leak waiting to happen.
5. Enable Audit Logging
Without logs, a post-incident investigation is impossible: you won't know what happened or how far the attacker got. Make sure auditing is enabled and retained long enough.
6. Protect Email
Turn on anti-phishing and anti-spoofing protections, and correctly configure your SPF, DKIM, and DMARC records so no one can send emails in your name.
7. Track Your Secure Score
Microsoft gives your organization a security rating, the Secure Score, along with prioritized recommendations. It's an excellent starting point for measuring your progress over time.
Hardening Is Never a One-Time Job
Settings change, new options appear, and the way you use the platform evolves. A periodic review keeps your environment solid over the long run.
Want us to go through your Microsoft 365 with a fine-tooth comb? Contact us for a configuration audit.
