Adobe URLs being flagged

Defender can generate false positive alerts on legitimate domains (including vendor URLs such as Adobe) due to how its detection engines and correlation logic work, but this behavior does not necessarily indicate a defect in the core correlation rules.

From the documented behavior:

1. False positives are expected occasionally in any threat protection system, including Microsoft Defender for Endpoint and Defender XDR. Legitimate entities (files, processes, URLs, domains) can be misclassified as malicious.
2. When alerts are raised for activity that is actually benign, the recommended approach is:
   • Review and confirm the alert is a false positive.
   • Classify the alert as a False positive in the Microsoft Defender portal.
   • Suppress the alert (or tune it) so that similar benign activity generates less noise.
   • Create an Allow indicator for the specific entity (for example, the Adobe URL or domain) if appropriate for the environment.
   • Submit affected samples or URLs to Microsoft for analysis so detection logic can be corrected.

Practical steps to handle the Adobe URL alerts:

1. In the Microsoft Defender portal, go to Incidents & alerts → Alerts, open one of the Adobe URL alerts, and verify it is benign.
2. Use Manage alert → Classification to set it to False positive and save.
3. Use Create suppression rule from the alert details to reduce repeated noise from the same pattern (for example, same URL/domain or detection name).
4. If the detection is coming from Defender for Endpoint:
   • Create an Allow indicator for the specific URL or domain if it is known-good in the environment (see “Create indicators” for Defender for Endpoint).
5. Submit the affected URLs/files to Microsoft for reanalysis via the appropriate submissions workflow (for example, the Defender portal Submissions page or the Microsoft Security Intelligence submission portal). This is the supported way to get false positives corrected in the backend.

These actions both reduce immediate alert noise and feed back into Microsoft’s detection tuning pipeline. Recurring issues on specific vendor URLs should be reported through submissions and, if they persist after definition updates, escalated via Microsoft Support with concrete examples (alert IDs, detection names, timestamps) so engineering can review the specific correlation or signature logic involved.

References:

• Address false positives/negatives in Microsoft Defender for Endpoint
• Resolve false positive malware detections
• Introduction to malware scanning
• Report false positives or false negatives in automated investigation and response (AIR)
• Vulnerability assessment support in Microsoft Defender Vulnerability Management