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Application Behavior Protection suddenly blocking my Excel documents


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I'm running Malwarebytes Premium version 4.2.1.89 on my Windows 10 PC. Today I tried to open a Microsoft Excel spreadsheet which is saved on my Microsoft OneDrive and my own PC. Malwarebytes Premium blocked it with a warning about it having been blocked by the Application Behaviour Protection layer and in the Protection Technique is states "Exploit payload macro process blocked". I have attached a txt version of the alert. The spreadsheet I was opening was created by myself years ago but I regularly update it (again it is only updated by myself) so I could not understand this. I did a search of these forums and - within the version 4.2 beta testing forum - I found the thread about similar problems when opening Microsoft Word documents. The thread is at:  https://forums.malwarebytes.com/topic/264227-anti-exploit-blocking-word-documents/

So, based on the most recent recommendations within that thread, I turned off Exploit Protection and closed and restarted Malwarebytes. I then switched Exploit Protection back on again. Now I find I can open this spreadsheet without difficulty. As I have never changed the default program settings (screenshot attached) I suspect this must be due to a bug in your software. I have also attached a screenshot showing my current Malwarebytes Premium version details.

Gareth

 

Malwarebytes Advanced Exploit Protection settings 12Oct20.jpg

Malwarebytes Version Info 12Oct20.jpg

MalwareBytes - Excel - Exploit Payload Macro blocked.txt

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Dont have sufficient time to waste further on this issue today as per your request above, but suffice to say that as just posted at

I'm told that Malwarebytes are already aware of this bug. I'm reassured by this, so it will hopefully be resolved in an upcoming update. For my part clicking the restore defaults button and restarting the app fixed the issue for me.

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The above reply requesting logs from the Support Tool is just an automated response from the forum bot that replies to every new thread so don't worry about that.

Thank you for testing and reporting your success with the workaround.  As with the previous reports, I'll document your case and report it to the Product team and hopefully we will see a fix soon in an upcoming release.

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I'm assuming a restore defaults will also wipe out exclusions put into place, custom scan schedules, etc?  If so, the only work around at present is to disable the exploit protection module and deal with the annoying popup notifications?  Can't a roll back be push out in the interim since this clearly affects a LOT of users?

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3 minutes ago, ASI said:

I'm assuming a restore defaults will also wipe out exclusions put into place, custom scan schedules, etc? 

Resetting only the  Exploit settings to default does not affect the above.

Edited by Porthos
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2 minutes ago, Porthos said:

 

Resetting only the  Exploit settings to default does not affect the above.

Right, the Restore Defaults button we're referring to can be found under the Security tab in settings by clicking the Advanced settings button under the Exploit Protection section and it only impacts those advanced settings listed in that pop-up window under the tabs found there.  It doesn't affect any of Malwarebytes' other settings nor does it remove any existing exclusions.

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No problem at all; both buttons/functions are similarly titled (Restore default settings and Restore Defaults) so it's perfectly understandable :) 

If there's anything else we can help with please let us know.

Thanks

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