omegaminus Posted May 12, 2018 ID:1242468 Share Posted May 12, 2018 Hello, I'm experiencing a problem that appears to be identical to the one described in this discussion on Microsoft Technet. The problem is that when Malwarebytes is installed, terminated processes leave memory unreleased, particularly in the Page Table. This chews up a lot of memory over time if many processes are started and stopped. I did not have the program listed as the culprit in the above discussion, so I used DriverView to see all of my installed drivers, started from what was most recently installed or updated and worked back, using RAMMap to see if closed processes remained in the table with memory unreleased. Malwarebytes seems to be the culprit. When it is installed, closed processes do not disappear after refreshing the Processes tab in RAMMap, while after uninstalling it, they do disappear. I was using 3.4.5 when I found the problem, and I get the same problem after updating to 3.5.1. I'm using a fully-updated Windows 10. Link to post Share on other sites More sharing options...
Staff Malwarebytes Posted May 12, 2018 Staff ID:1242469 Share Posted May 12, 2018 ***This is an automated reply*** Hi, Thanks for posting in the Malwarebytes 3 Help forum. If you are having technical issues with our Windows product, please do the following: Spoiler If you haven’t already done so, please run the Malwarebytes Support Tool and then attach the logs in your next reply: NOTE: The tools and the information obtained is safe and not harmful to your privacy or your computer, please allow the programs to run if blocked by your system. Download Malwarebytes Support Tool Once the file is downloaded, open your Downloads folder/location of the downloaded file Double-click mb-support-X.X.X.XXXX.exe to run the program You may be prompted by User Account Control (UAC) to allow changes to be made to your computer. Click Yes to consent. Place a checkmark next to Accept License Agreement and click Next You will be presented with a page stating, "Welcome to the Malwarebytes Support Tool!" Click the Advanced Options link Click the Gather Logs button A progress bar will appear and the program will proceed to gather troubleshooting information from your computer Upon completion, click OK A file named mbst-grab-results.zip will be saved to your Desktop Please attach the file in your next reply. Click "Reveal Hidden Contents" below for details on how to attach a file: Spoiler To save attachments, please click the link as shown below. You can click and drag the files to this bar or you can click the choose files, then browse to where your files are located, select them and click the Open button. After posting your new post, make sure you click the Follow button near the top right of this page, and select the option "An email when new content is posted Change how the notification is sent" so that you're alerted by email when someone has replied to your post. One of our experts will be able to assist you shortly. If you are having licensing issues, please do the following: Spoiler For any of these issues: Renewals Refunds (including double billing) Cancellations Update Billing Info Multiple Transactions Consumer Purchases Transaction Receipt Please contact our support team at https://support.malwarebytes.com/community/consumer/pages/contact-us to get help If you need help looking up your license details, please head here: https://support.malwarebytes.com/docs/DOC-1264 Thanks in advance for your patience. -The Malwarebytes Forum Team Link to post Share on other sites More sharing options...
dcollins Posted May 12, 2018 ID:1242524 Share Posted May 12, 2018 Can you provide reproduction steps? "terminating a process" can mean a few things, so knowing exact reproduction steps for this will help a lot. Thanks! Link to post Share on other sites More sharing options...
omegaminus Posted May 12, 2018 Author ID:1242539 Share Posted May 12, 2018 Reproducing it is just a matter of installing Malwarebytes. I've attached a number of images to illustrate the difference in system behaviour between having it installed and not having it installed. What happens with Malwarebytes installed: Picture 1: Process list view in RAMMap immediately after rebooting the machine. Picture 2: Same view after starting notepad.exe. It is using about 3MB of memory. Picture 3: Same view after closing notepad by clicking the X in the upper-right of the window. Notepad.exe remains in the list with 72k of memory usage. What happens after uninstalling Malwarebytes: Picture 4: Process list view in RAMMap immediately after rebooting the machine. Note that all the entries for OAWrapper.exe from the first set of images are no longer there, and that also the scroll bar indicates that the complete process list is much shorter than it was with Malwarebytes installed. Picture 5: Same view after starting notepad.exe. It is using about 3MB of memory, same as before. Picture 6: Same view after closing notepad by clicking the X in the upper-right of the window. Notepad.exe is no longer on the list. Link to post Share on other sites More sharing options...
dcollins Posted May 12, 2018 ID:1242549 Share Posted May 12, 2018 Thanks. It looks like RamMap has a bug with 1803 where it won't show any memory details so I'll have to spin up a VM on 1709 to test. I'll look into this in the coming week. Thanks for the detailed report Link to post Share on other sites More sharing options...
dcollins Posted May 12, 2018 ID:1242557 Share Posted May 12, 2018 (edited) Update: I've been able to reproduce and informed our engineers, thanks again. Of note, this is from the Ransomware Protection module. Unfortunately simply disabling it does not solve the problem, you have to reboot with the module disabled. Update 2: This should be fixed in our upcoming standalone update to Anti-Ransomware, which means it should get pulled into our next MB3 release Edited May 14, 2018 by dcollins Link to post Share on other sites More sharing options...
Staff tetonbob Posted June 4, 2018 Staff ID:1248004 Share Posted June 4, 2018 Our latest Component Update 1.0.374 contains the fix for the issue reported by @omegaminus. It is being metered out as usual but you can also use the "Install Application Updates" button on the Settings > Application tab to download the latest. A reboot would be required after the Component Update to see the benefits of this fix. Link to post Share on other sites More sharing options...
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