According to Microsoft, the scanner can only be run for up to 10 days after installation, after which it must be re-downloaded – this ensures that it always has up-to-date signatures. MSRT used a mini database of widely distributed threats and is distributed monthly via the automatic update function.Īdding in a complete database bulks up Safety Scanner's file size to around 64 MB – still smaller than many software updates. According to AV-Test's Andreas Marx, the on-demand anti-virus scanner appears to be based on the Malicious Software Removal Tool (MSRT), but with the addition of a complete signature database. This scans for and removes malware from Windows systems without requiring prior installation.
Microsoft has released its free Microsoft Safety Scanner (MSS).
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