如需更新你在 Windows 安全中心（在以前版本的 Windows 10 中称为 Windows Defender 安全中心）的签名，请执行以下操作：
依次选择“开始”菜单 >“设置” >“更新和安全” >“Windows 安全中心”>“病毒和威胁防护”。
选择“检查更新”（在以前版本的 Windows 10 中，则选择“病毒和威胁防护更新”）。
在“威胁定义”下，选择“检查更新”。
如果 Windows 安全中心发现新签名，它就会下载并安装该签名。
更新将在安装新签名后完成。请记住这些事项。
注意：如果你在尝试下载或更新签名时收到一条错误消息，则可能至少要等待一个小时，并且可能要重试或手动更新签名。
此外，请确保你想要下载的签名至少为 50 MB，以确保获取完整的签名文件。
Security intelligence updates for Microsoft Defender Antivirus and ...
Microsoft continually updates security intelligence in antimalware products to cover the latest threats and to constantly tweak detection logic, enhancing the ability of Microsoft Defender Antivirus and other Microsoft antimalware solutions to accurately identify threats.
仅显示来自 microsoft.com 的搜索结果Antimalware Updates
Microsoft continually updates security intelligence in antimalware products to …
Threats
Learn about the world's most prevalent cyberthreats, including viruses and …
Definition Change Log
Change logs for security intelligence update version 1.423.43.0. This page lists newly …
Third-party notices and infor…
THIRD PARTY SOFTWARE NOTICES AND INFORMATION - Windows …
KB4052623
To see the most current engine, platform, and signature date, see Security …
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Select the option to enable automatic updates. Use the drop-down menu to select the frequency to search for updates. Select if you want a background scan to be run every time the signature …
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The WatchGuard Agent downloads signature files (knowledge updates) to help identify the newest security threats. We recommend that you do not disable automatic updates. A computer with …
Update-MpSignature (Defender) | Microsoft Learn
The Update-MpSignature cmdlet updates the antimalware definitions with the latest definitions available on an update server.
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