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A service was installed in the system. MBAMSwissArmy

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My computer suddenly shutdown while I was watching a video. I waited a few seconds (perhaps 5?) after shutdown.  It did not automatically restart, so I pressed the power button to restart.  Based on messages on my monitor, both the shutdown and the startup were related to Windows Updates.  But when I checked my Windows Update page I saw there was no update that took place today, or recently.  Next I checked the event log to try to determine the cause of the shutdown.  I found this entry:  

A service was installed in the system.

Service Name:  MBAMSwissArmy
Service File Name:  \SystemRoot\system32\DRIVERS\mbamswissarmy.sys
Service Type:  kernel mode driver
Service Start Type:  demand start
Service Account:  

I confirmed file "C:\Windows\System32\drivers\mbamswissarmy.sys" exists on my computer with a timestamp which matches the timestamp of the event in the event log.  The file size of this file is 278,344 bytes.  Googling confirms that Malwarebytes does have a file with this name.  Two questions:

1.  I want to validate that this file really is a legitimate Malwarebytes file. Is there an MD5 or something similar that Malwarebytes publishes for this file that I can use to validate the correctness of my file?  

2.  Is it normal behaviour for my computer to shutdown when Malwarebytes updates this file with zero notification to me as the user?  Is there a way to change this so that I am at least notified of the pending update and so that I can choose when to shutdown and restart my computer?


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The file mbamswissarmy.sys is the kernel mode driver used for the scan engine in Malwarebytes and my guess is that this occurred during the start of a scheduled scan, though why the system restarted/shut down I do not know.  You can check your scheduled scan settings as this may be the reason as there is an option to have Malwarebytes restart the system automatically to clean up any detected threats following a scheduled scan if required for the cleanup process, however this option is disabled by default.

You can find the full details on scheduled scan settings in this support article.

Please let us know if you encounter this issue again or if any further issues occur.


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