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By default, Microsoft Defender is configured to check for updates . The specific frequency depends on the update channel configured, but in the standard "Current Channel," the engine and platform are generally updated monthly, while signature (threat definition) updates can occur multiple times a day. microsoft defender signature update frequency
Administrators often set the interval to every 4 hours to match Microsoft's release cadence. It typed: By default, Microsoft Defender is configured
These updates provide structural improvements to the antivirus itself and are typically released once per month . each with its own release cadence:
Beyond the time-based interval, Defender employs "event-triggered" updates to close security gaps quickly. These triggers bypass the scheduled timer if specific conditions are met. Common triggers include:
While automation is standard, security teams should maintain the ability to push a manual signature update during an active incident. This can be done via PowerShell ( Update-MpSignature ) or through the Defender Security Center console.
Microsoft distinguishes between different types of updates, each with its own release cadence: