Long scan time

[Snarkyfork]

I was cleaning up a friends laptop after a windows update and noticed Malwarebytes taking a very long time to finish scanning. I ran a full scan with rootkits checked and shes on windows 10 v1809. AVG is the only other AV active but I tried doing a scan with it disabled and got the same results. She has a 1TB hard drive with out 450 gigs of it in use. The scan goes pretty fast until it reaches the heuristics analysis then at about 280,000-300,000 files scan it slows down dramatically. I let it scan over night for about 12 hours and it still didn't finish. I have a similar laptop and run the same AV setup as she has, both of our laptops are nearly identical in every respect and my scans finish in about 5 minutes. Any insight into this would be greatly appreciated, thanks.

Malwarebytes v3.6.1

 

[Malwarebytes]

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[Snarkyfork]

Here are the log files. I noticed a high disk usage from MB and posted a screenshot. I also did a complete reinstall of MB and nothing seemed to change.

mbst-grab-results.zip

[Firefox]

1 hour ago, Snarkyfork said:

I ran a full scan with rootkits checked and shes on windows 10 v1809. AVG is the only other AV active but I tried doing a scan with it disabled and got the same results. She has a 1TB hard drive with out 450 gigs of it in use.

Hello and Welcome to Malwarebytes, a Full scan will take some time to scan a drive.  All that is really needed is a Threat Scan, that will scan all the places where malware likes to hide and clean up your system.  Also if you enable Rootkit scanning that will also increase the time it takes it to scan a drive.

As for the screenshot above, since you were doing a Full scan, that would explain whey Malwarebytes Service was using up your hard drive as in the screenshot shows.

[LiquidTension]

Hello Snarkyfork,

If you disable the Scan for rootkits setting, does this have any impact on the issue?
 

15 hours ago, Snarkyfork said:

I let it scan over night for about 12 hours and it still didn't finish

To confirm, did the scan eventually finish or just run indefinitely/hang? Does it always reach the Heuristics Analysis stage of the scan?

Please do the following:

Enable Malwarebytes Enhanced Event Log Data Setting

• Open Malwarebytes.
• Click the Settings menu.
• Ensure the Application tab is selected.
• Scroll down to Event Log Data.
• Turn the Collect enhanced event log data for support setting On.

Once done, please rerun a scan with Malwarebytes using the same settings/conditions. When the scan appears to hang, please rerun the Malwarebytes Support Tool. Click Advanced > Gather Logs and provide the newly created mbst-grab-results.zip (found on your desktop).

[Snarkyfork]

Sorry for the late reply. The normal full scan completes with no issues and it seems to check fcr root kits. I was doing a custom scan with root kits checked and that scan doesn't seem to finish, no matter how much time passes. It keeps getting slower and slower until its barely moving at all. I noticed she has a high disk usage even without MB running... so let me run some diagnostics, she might have a bad windows update. I'll most likely do a clean install of windows and see if that helps. If not then I'll be back, heh.

[LiquidTension]

Thanks for the information. I'll look out for any potential updates in the upcoming days.