Change log for definition version 1.277.1243.0 RSS feed icon

This page lists what has changed in the most recent definitions update for Windows Defender Antivirus and Microsoft Security Essentials.

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The following tables list the new and updated definitions for the version you select here. You can choose from the 20 latest updates, and the most recent update is shown by default:

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Definition available date: Oct 17,2018 06:37 PM UTC

New definitions


No new threats have been identified in this definition update.

Updated definitions


No threat detections were updated in this definition update.