Microsoft Defender AV: Update Signatures from PowerShell

 

Here's how to update your Microsoft Defender Antivirus signatures using PowerShell:

• Open a PowerShell (or Terminal) as Administrator
• Run the following command: Update-MpSignature -UpdateSource MicrosoftUpdateServer
  
  

Now just wait for the process to finish and you're done! :)

Microsoft Defender AV: Update Signatures from Command-Line

 

If you need to update your Microsoft Windows Defender Antivirus signatures, here's how:

• Open a CMD as Administrator
• Run the following command: "%ProgramFiles%\Windows Defender\MpCmdRun.exe" -SignatureUpdate
  
  

Now just wait the process to finish and you're done!

Microsoft Defender AV: Client Logs

 

For everyone implementing Microsoft Windows Defender Antivirus, here's a quick note where to find the client logs and how to use them:

• C:\ProgramData\Microsoft\Windows Defender\Support
• MPLog-######-#####.log
• MPDetection-######-#####.log
• MPCacheStats.log (Defender Only)
  
  

You should use the MPLog to:

• Search Threat Name to locate a record of malware detection.
• Search Scan Source to locate a record of a scheduled scan running or record a running scan that is on demand.
• Search Expensive file to locate an instance of an expensive file detection during a scan.
• Seach on update process