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Update configure-block-at-first-sight-microsoft-defender-antivirus.md

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Denise Vangel-MSFT
2020-10-23 10:33:40 -07:00
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windows/security/threat-protection/microsoft-defender-antivirus/configure-block-at-first-sight-microsoft-defender-antivirus.md
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title: Enable block at first sight to detect malware in seconds
description: Turn on the block at first sight feature to detect and block malware within seconds, and validate that it is configured correctly.
description: Turn on the block at first sight feature to detect and block malware within seconds.
keywords: scan, BAFS, malware, first seen, first sight, cloud, defender
search.product: eADQiWindows 10XVcnh
ms.prod: w10
@ -24,7 +24,7 @@ ms.date: 10/22/2020
- Microsoft Defender Antivirus
Block at first sight provides a way to detect and block new malware within seconds. This protection is enabled by default when certain prerequisite settings are enabled. These settings include cloud-delivered protection, a specified sample submission timeout (such as 50), and a file-blocking level of high. In most enterprise organizations, these settings are enabled by default with Microsoft Defender Antivirus deployments.
Block at first sight provides a way to detect and block new malware within seconds. This protection is enabled by default when certain prerequisite settings are enabled. These settings include cloud-delivered protection, a specified sample submission timeout (such as 50 seconds), and a file-blocking level of high. In most enterprise organizations, these settings are enabled by default with Microsoft Defender Antivirus deployments.
You can [specify how long a file should be prevented from running](configure-cloud-block-timeout-period-microsoft-defender-antivirus.md) while the cloud-based protection service analyzes the file. And, you can [customize the message displayed on users' desktops](https://docs.microsoft.com/windows/security/threat-protection/windows-defender-security-center/wdsc-customize-contact-information) when a file is blocked. You can change the company name, contact information, and message URL.