Security Policy Errors

Why Microsoft Defender Reports a Malicious URL Click and How to Investigate

Anum Mushtaq Oct 21, 2026 868 views

Question details

Microsoft 365 Defender generates alerts for malicious URL clicks, but administrators suspect these might be false reports where no user intentionally clicked the link.

Why Microsoft Defender Reports a Malicious URL Click

Product: Microsoft 365 Defender
Device & OS: not provided
Scenario: Investigating security alerts triggered by Safe Links to determine if a malicious URL was genuinely clicked by a user.
Observed behavior: The system reports a malicious URL click alert when a link is scanned, rewritten, or evaluated, even if the user did not actively click the link at the reported time.

Before you start

Ensure you have Security Administrator or Global Administrator privileges in the Microsoft 365 Defender portal to access incident details and audit logs.

Solution 1Recommended

Investigate Defender Incident Details and Audit Logs

Review the alert details and user activity logs to determine if the click was a genuine user action or an automated process.

Safe Links is designed to scan, evaluate, and rewrite URLs to protect users from malicious sites. However, automated scanning, email preview panes, or third-party security tools can sometimes evaluate a link automatically. This causes Microsoft Defender to register the event as a 'click', resulting in a false positive alert even if the user took no action.

Access the Defender Portal

Locate the Alert

Navigate to the 'Incidents & alerts' section on the left-hand menu and select 'Alerts' to find the specific 'Malicious URL click' alert.

Review Alert Details

Click on the alert to open its details pane. Check the exact timestamp of the reported click.

Compare with User Activity

Cross-reference the alert timestamp with the user's actual activity or sign-in logs. If the click happened while the user was inactive, it was likely triggered by an automated system.

Check Audit Logs

Review the Microsoft 365 audit logs for 'SafeLinks' events to see if the URL evaluation was triggered by an email preview pane or a background security scan.

Investigate Defender Incident Details and Audit Logs

Identifying False Positives: If the audit logs show that the URL was evaluated immediately upon email delivery, it is highly likely that an automated scanner or preview pane triggered the alert, rather than a genuine user click.

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Frequently Asked Questions

Why does Safe Links report a click when the user didn't open the email?

Email clients with preview panes enabled can automatically load message content in the background. This automatic loading causes Safe Links to evaluate the URL, which Microsoft Defender then registers as a click.

Can third-party security tools trigger a malicious URL click alert?

Yes. If your organization uses additional email filtering or security software that automatically scans or sandboxes links in incoming emails, Microsoft Defender may record this automated evaluation as a URL click.

Where can I find the exact timestamp of the URL click?

You can find the exact timestamp by navigating to the Microsoft 365 Defender portal, going to 'Incidents & alerts', clicking on 'Alerts', and opening the specific malicious URL alert to view its timeline details.

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