Change log for version 1.257.1466.0 RSS feed icon

This page shows you what's changed in the most recent definitions update for Microsoft antimalware and antispyware software.

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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: Dec 06,2017 05:03 PM UTC

New definitions

No new threats have been identified in this definition update.

Updated definitions