Baselines, applied to your real context
We benchmark against Secure Score, the CIS Microsoft 365 Benchmark and CISA SCuBA, then translate them into practical, prioritised decisions, not a generic checklist of everything at once.
MICROSOFT 365 HARDENING
Attackers don’t hack Microsoft 365. They log in.
Microsoft 365 is where your email, collaboration, file storage and identity live. It is also where attackers go first: stolen credentials, compromised shared mailboxes, overshared files, dangerous forwarding rules. We audit your M365 configuration against real attack chains, find what is exposed, and hand you the exact remediation steps.
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Trusted by security and IT teams in highly regulated environments
Microsoft 365 hardening is a tenant-level security service that assesses your configuration against recognised baselines, then reconfigures identity, email, devices and data to close the gaps that default settings leave open.
See where your tenant stands, then decide.
30 minutes to map your tenant, the licences you run and what’s driving the review: a migration, admin sprawl, or an incident you’re still cleaning up.
A misconfigured M365 tenant is not a scanning problem, it is an attacker’s shortcut.
We review your identity, Exchange, SharePoint, Teams and compliance settings the way an adversary would, find the misconfigurations that matter, and prove which ones lead to unauthorised access.
Why teams choose us for this.
Hardened by people who attack for a living
Our red team and penetration testing experience tells us which controls actually stop an intrusion, so we harden what matters first instead of chasing a perfect score.
Hands-on, through to verified closure
We configure, pilot, roll out and validate, so risk genuinely drops and you can prove it to an auditor.
Licence-aware, no upsell games
We harden to what you already own and are transparent about where a licence, such as Purview or E5, would unlock more. You decide, with the full picture.
Every finding, owner and change in one place.
From day one, findings live in our platform, not just in a document: your M365 configuration issues, the business impact, the exact remediation steps, and validation that each one is actually closed.
PLATFORM WALKTHROUGH
We at Etnia highly value our collaboration with Asperis Security.
Frequently asked questions
Can’t find your answer? Let’s talk. 30 minutes with a specialist to clear up your specific situation.
Microsoft 365 hardening is a tenant-level security service that assesses your configuration against recognised baselines and then reconfigures identity, email, devices and data to close the gaps default settings leave open. The goal is to turn a working tenant into a defended one, measured against Microsoft Secure Score, the CIS Microsoft 365 Benchmark and CISA SCuBA. Asperis delivers it hands-on, through to validated closure.
No. Microsoft 365 defaults are tuned for easy adoption and low friction, not for defence, so an out-of-the-box tenant leaves gaps in identity, sharing, email and app permissions. Microsoft gives you the controls, but you have to configure them. Hardening is the work of turning those controls on correctly and in the right order.
Microsoft Secure Score is a useful signal of posture and a list of suggestions; hardening is the actual work of prioritising, implementing and verifying the changes. Secure Score does not weigh recommendations by real attacker risk, apply anything for you, or confirm a change held. We use it as one input alongside CIS and CISA SCuBA, then turn it into a defensible, executed result.
It covers five areas: identity and access in Entra ID, email in Defender for Office 365, devices in Intune, data and collaboration across SharePoint, OneDrive, Teams and Purview, and sign-in trust through corporate branding. Within each, we prioritise the controls that stop a real intrusion, such as Conditional Access, app-consent governance, token protection, Safe Links and data loss prevention.
Most of the hardening is achievable on Microsoft 365 Business Premium, which includes Entra ID P1, Intune and Defender for Office 365. A few advanced data-protection controls, such as data loss prevention in Teams and AI auto-classification, require Microsoft Purview or E5. We harden to the licence you already have and tell you plainly where an upgrade would add value, so there is no pressure to buy more than you need.
The assessment is non-disruptive, and changes are planned to avoid impact. We apply them around your change windows, communicate in advance, pilot on a small group and roll out in phases, with a rollback option where it applies. The aim is stronger security your users barely notice.
Typically controlled, least-privilege read and configuration access to the services in scope. Where a specific change needs to be executed, the roles are agreed during scoping and kept time-limited and fully traceable, so you always know what was changed, by whom and when.
No. Microsoft 365 hardening complements your IT team or managed provider, it does not replace them. We bring the offensive perspective and the baselines, do the hardening with you, and hand over documentation so your team can maintain the result day to day.
Cost depends on tenant size, the services in use, complexity such as multi-geo or multiple business units, and audit needs. We provide a fixed proposal with scope, timeline and cost before we start, so there are no surprises. Book a short introductory meeting and we will size it to your tenant.
Ready to turn a working tenant into a defended one?
An M365 hardening engagement is a configuration partnership. You own the tenant, we audit the security, we deliver the proof. What is exposed, what it costs to fix, what is actually closed.
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