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BSOD in mwac.sys together with tcpip.sys

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I have opened already a ticket and uploaded the stuff the mb-support tool is collecting. But I was not able to upload the MEMORY.DMP file.

And I did not get any replay from MB Support.

Therefore I decided to create new topic about this problem in the forum.

I have already encountered twice a BSOD in tcpip.sys and mwac.sys. And this is not great.

WhoCrashed reports:

Crash Dump Analysis

Crash dumps are enabled on your computer. 

Crash dump directories: 

On Mon 2020-10-12 18:22:55 your computer crashed or a problem was reported
crash dump file: C:\WINDOWS\Minidump\101220-188343-01.dmp
This was probably caused by the following module: tcpip.sys (0xFFFFF8061C6A1217) 
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF8061C6A1217, 0xFFFFF080E15B5D10, 0x0)
file path: C:\WINDOWS\system32\drivers\tcpip.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: TCP/IP Driver
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code. 
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. 
The crash took place in a Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system that cannot be identified at this time. 

On Mon 2020-10-12 18:22:55 your computer crashed or a problem was reported
crash dump file: E:\Dump\MEMORY.DMP
This was probably caused by the following module: mwac.sys (mwac+0x13ADF) 
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF8061C6A1217, 0xFFFFF080E15B5D10, 0x0)
file path: C:\WINDOWS\system32\drivers\mwac.sys
product: Malwarebytes Web Protection
company: Malwarebytes
description: Malwarebytes Web Protection
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code. 
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. 
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: mwac.sys (Malwarebytes Web Protection, Malwarebytes). 
Google query: mwac.sys Malwarebytes SYSTEM_SERVICE_EXCEPTION

Attached are the output of mb-support tool.

To which address can I send the MEMORY.DMP file for further analysis? Or do you not want it?




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***This is an automated reply***


Thanks for posting in the Malwarebytes for Windows Help forum.

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  • Solution


You're running an older version of Malwarebytes.  Please install the latest version from here then restart your system to see if the BSOD issue is fixed.  If it persists it may be due to the presence of Adguard since Adguard, like Malwarebytes, uses a WFP filter driver for blocking websites and servers.  This means you may need to disable Adguard's WFP filter or Malwarebytes' Web Protection component to prevent the conflicts from occurring.  Additional details about the issue can be found in this support article.

Please let us know how it goes.


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Yes, you now have the latest version :)

Is everything running OK now?  If so, I also noticed you have a lot of items running at startup which can hurt your system's overall performance and there may be some PUPs (Potentially Unwanted Programs) present as well.  I'd suggest you run a scan with Malwarebytes and allow it to remove anything it finds, then do the same with ADWCleaner.  You may also want to have one of our malware removal specialists take a look if you wish as they can check for any additional PUPs and threats and guide you in cleaning them up.  If you wish to do so, please follow the instructions in this topic then create a new topic in our malware removal area by clicking here and a malware removal specialist will guide you in checking and cleaning your system of any threats.

Further tips on keeping your system secure and clean of threats can be found in the following topic: Tips to help protect from infection

I hope this helps.

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Yes, everything runs OK now. I hope the BSOD will not occur again.

I have downloaded ADWCleaner and did run it. It found only three things and two pre-installed programs from Lenovo (which I don't mind).

It found this:

- file Askcom.xml in a Firefox profile searchplugins directory
- directory Search in C:\users\<user>\Favorites (I don't know why that is bad?)
- a registry key which belongs to some known good programs and which is certainly not malware (I have no idea why ADWCleaner flags this)

I did let it remove the first two and rebooted.

And, yes, I have a lot of items starting automatically when the PC boots. But that is OK.

Thanks for your support.

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ADWCleaner detects the search plugin for Ask.com; it isn't harmful, it's just something that gets installed bundled with other apps often times so they classify it as PUP, and I'm not sure why it detected the Search directory, but it's likely because it's a part of Ask or some other PUP.  I don't know what the registry key was for the known good programs, but in addition to PUPs, ADWCleaner also targets a lot of software that comes preinstalled on systems that isn't required for the system to function in order to improve system performance.  It isn't just a malware scanner; it's more of an adware/PUP scanner that also targets non-malicious items to speed up systems.

Sure, as long as you're in control of your startups and have things set up the way you want then that's fine; I just wanted to make sure you didn't have a bunch of startups that you didn't know about, potentially hurting your system's performance.

The BSOD issue should be resolved now since you installed the latest version of Malwarebytes and disabled the WFP filter in AdGuard, but definitely let us know if it returns or if there's anything else we can help with.

Edited by exile360
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