Microsoft 365 risk
Account monitoring needs context, not just alerts.
Find meaningful changes in identity activity without treating every unfamiliar location or failed login as an attack.
An unusual event is a question
A sign-in from a new location may reflect travel, a network provider change or a threat. A failed login may be a forgotten password or part of a wider attempt to gain access. Monitoring becomes useful when a reviewer can compare the event with the account's role, device and surrounding activity.
Avoid interpreting every alert as proof of compromise. That creates unnecessary disruption and encourages people to ignore warnings. Establish what evidence raises the priority and which questions must be answered before the case is closed.
Build a baseline that can change
Document expected patterns for ordinary users, administrators and service identities. A service account used for an integration should not be evaluated as though it were a traveling employee. Review the baseline when responsibilities or applications change, and keep justified exceptions visible.
Connect relevant sign-in events with account creation, permission changes and application activity where those records are available. Check that timestamps align and retention is sufficient for the investigation window. A missing record should be reported as a visibility limitation, not treated as evidence that nothing happened.
Give the alert an owner
Define who reviews the event, how the user can be contacted safely and when the response lead should be involved. Monitor the health of the logging pipeline itself. Feature availability, licensing and collection settings affect what can be investigated, so review those dependencies before promising broad coverage.
In practice
An unfamiliar sign-in follows a genuine trip
Illustrative scenario, not a client case study.
In an illustrative case, an employee travels for a client meeting and triggers an unfamiliar-location alert. The same account also shows an unexpected change to a security setting. The travel explanation addresses one event, but not necessarily the other.
- The reviewer compares available sign-in context, device details and the timing of changes. They contact the employee through an established channel rather than relying on a reply from the potentially affected account.
- They determine which actions the employee recognizes and document the remaining concerns. Related alerts and recent administrative changes are reviewed within the authorized investigation scope.
- If the evidence supports compromise, the team follows its incident procedure. If the activity is legitimate, it records why and adjusts the baseline only where the adjustment is justified.
A plausible explanation for one signal should not erase the rest of the evidence. Equally, an unfamiliar location alone is not enough to declare a breach.
What to put in place
- Define normal activity for important user and privileged-account groups.
- Correlate sign-ins with relevant account and application changes.
- Give investigators sufficient retained evidence and restrict who can access it.
- Record decisions and review noisy rules without suppressing meaningful coverage.
The takeaway
Account monitoring should make investigation more reliable. Its success depends on context, timely review and documented decisions, not the raw number of alerts generated.