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Jan 8 Release Slows Cmd Prompt

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I have an elevated cmd prompt that clears the Windows 10 Event Viewer Log. It has worked perfectly for years, takes less than 30 seconds to run. Since the release of the latest version of Malwarebytes this function has slowed down noticeably as it now takes a couple of minutes to run. It functions perfectly again if I exit Malwarebytes. Once I pinpointed that, I started to turn off the individual protections to see which one of them was the issue. Found that it's the "Ransomware Protection" that is causing the issue. The issue is reproducible. Turn it on and cmd prompts run slow, turn if off and cmd prompts again run quickly.

This was not an issue prior to the latest update (4.0.49/1.0.17531/1.0.793). I can live with the cmd slowdown, but it would be nice to fix this issue.

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Hi @Homer712,

Thank you for the report.

To assist our efforts in reproducing the issue you've reported, could you provide the following please:

  • The log file (mbst-grab-results.zip) mentioned in the "technical issue" instructions above.
  • The exact command (or combination of commands/script file) you're running that triggers the issue.
  • Roughly, how often do you clear the event logs?

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Log file attached. "Bat" file that clears the Event Viewer (do this a couple of times a week) is as follows:

:: Created by: Shawn Brink
:: Created on: August 15th 2016
:: Updated on: July 25th 2018
:: Tutorial: https://www.tenforums.com/tutorials/16588-clear-all-event-logs-event-viewer-windows.html

@echo off

FOR /F "tokens=1,2*" %%V IN ('bcdedit') DO SET adminTest=%%V
IF (%adminTest%)==(Access) goto noAdmin
for /F "tokens=*" %%G in ('wevtutil.exe el') DO (call :do_clear "%%G")
echo All Event Logs have been cleared!
goto theEnd

echo clearing %1
wevtutil.exe cl %1
goto :eof

echo Current user permissions to execute this .BAT file are inadequate.
echo This .BAT file must be run with administrative privileges.
echo Exit now, right click on this .BAT file, and select "Run as administrator".  
pause >nul



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Same problem as@Homer712, using same bat file. disabling Ransomware solves the slow down. Previous version works s it should.

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Hi @Homer712,

Thank you for the information.

This issue is reproducible and we have a defect filed. We'll be investigating the issue further and hope to have a fix available as soon as possible.

In the meantime, you should find that adding a file exclusion for C:\Windows\System32\wevutil.exe mitigates the issue entirely. Please refer to, Add to the Allow List in Malwarebytes for Windows v4.

Edited by LiquidTension

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