![]() This tool checks for specific, widespread types of malware and removes them if it finds them. If you install updates manually, you've probably been installing it as part of the manual update process - it's considered an important update, not just a recommended one.Īfter Windows downloads the newest version of the Microsoft Malicious Software Removal tool, it will automatically run it in the background. If you have your computer set to automatically install Windows Updates, it will be installed automatically. Microsoft releases a new version of this tool on the second Tuesday of every month - in other words, on "Patch Tuesday." It appears as just another patch in Windows Update. ![]() What is the Malicious Software Removal Tool? It doesn't run automatically in the background at all times, and only detects a few specific and widespread types of malware. I tried using SysInternals AutoRuns and looking at the Scheduled Tasks but was not able to find where it was being started.Bear in mind that this tool is no substitute for a solid antivirus program. So it is definitely installed and being run daily. The update KB890830 is not installed on this computer.Īccording to the C:\Windows\debug\mrt.log, C:\Windows\System32\MRT.exe is being run daily during the "Automatic Maintenance" window defined in the Action Center section of the control panel. We also tried running wusa.exe /uninstall /KB:890830 but it returned the error: We've had issues with MRT in the past and want to remove it, but now the script has declined the update and we cannot find anything under the View installed updates section to remove it. We have a script that declines KB890830 updates for our on-premise Windows Update Server, but we recently found someone approved one of the monthly updates before the script could run and the Malicious Software Removal Tool (MRT) was installed on all of our servers.
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