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Iaan 2016-07-19 12:24:32 -07:00
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windows/keep-secure/windows-defender-block-at-first-seen.md
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@ -11,9 +11,9 @@ ms.pagetype: security
author: iaanw author: iaanw
--- ---
# BLOCK AT FIRST SIGHT # Enable the Block at First Sight feature
Block at First Seen (BAFS) is a feature of Windows Defender cloud protection that provides a way to detect and block new malware within seconds. Block at First Sight (BAFS) is a feature of Windows Defender cloud protection that provides a way to detect and block new malware within seconds.
When a Windows Defender client encounters a suspicious but previously undetected file, it queries our cloud protection backend. The cloud backend will apply heuristics, machine learning, and automated analysis of the file to determine the files as malicious or clean. When a Windows Defender client encounters a suspicious but previously undetected file, it queries our cloud protection backend. The cloud backend will apply heuristics, machine learning, and automated analysis of the file to determine the files as malicious or clean.