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Unscheduled Custom Scans?

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I have Malwarebytes Premium, Component Package 1.0.103, Update Package Version 1.0.1776, running on Windows 10 Pro x64, Build 1607.

I have noticed, of late, that MBP is running unscheduled Custom Scans.  I have NO scans scheduled whatsoever.  I manually initiate a weekly Threat Scan.

I have never configured Custom Scans.  Threat Scans are the default (green check mark).


Here is an example of the log from an unscheduled Custom Scan that ran yesterday.  I got curious when again I noted the Dashboard telling me that there was a more recent scan than one that I had initiated.




-Log Details-
Scan Date: 4/20/17
Scan Time: 12:42 PM
Administrator: Yes

-Software Information-
Components Version: 1.0.103
Update Package Version: 1.0.1769
License: Premium

-System Information-
OS: Windows 10
CPU: x64
File System: NTFS
User: DESKTOP-AFS3I87\gario

-Scan Summary-
Scan Type: Custom Scan
Result: Completed
Objects Scanned: 1
Time Elapsed: 0 min, 4 sec

-Scan Options-
Memory: Disabled
Startup: Disabled
Filesystem: Enabled
Archives: Enabled
Rootkits: Disabled
Heuristics: Enabled
PUP: Enabled
PUM: Enabled

-Scan Details-
Process: 0
(No malicious items detected)

Module: 0
(No malicious items detected)

Registry Key: 0
(No malicious items detected)

Registry Value: 0
(No malicious items detected)

Registry Data: 0
(No malicious items detected)

Data Stream: 0
(No malicious items detected)

Folder: 0
(No malicious items detected)

File: 0
(No malicious items detected)

Physical Sector: 0
(No malicious items detected)



Is this supposed to happen?  It is not a major issue for me, if this is planned behavior.  This might be documented somewhere, but I was unaware of it.

I know that my Bitdefender 2017 Total Security initiates an unscheduled "Quick Scan" after a certain computer idle period on some schedule it creates and is known only to itself.

Thank you and have a great day.


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  • Root Admin

Hello @garioch7

We can run some logs to see what is scheduled, but you should see them in the Settings, Scan Schedule.

If it's still an issue then it might be best to do a clean removal and reinstall of the program.

Please read and try the following. If the clean removal and reinstall works, great, if not then please post back all of the requested logs so we can check and see what's going on.

  1. Please follow the steps in this pinned topic to uninstall your current version of MBAM and reinstall the latest build - Malwarebytes mb-clean tool (NOTE: After uninstalling with the mb-claen tool you will be asked to reboot.  Once you reboot it will ask you if you want to re-install Malwarebytes, you can select YES or you can download the latest version (currently v3.0.6 CU4.1) to re-install from HERE)
  2. If that does not correct the issue, then please read the following and attach to your next reply the 4 requested logs - Diagnostic Logs (the 4 logs are: mbam logs zipped, FRST.txt, Addition.txt and mb-checkResult.txt)
  3. NOTE: More info about the latest Malwarebytes 3.0.6 CU4.1 HERE; MB 3 User Guide ONLINE; MB 3 User Guide PDF; MB 3 FAQ: Malwarebytes 3.0 - Frequently Asked Questions

Please let us know how it goes.

Thank you



Post updated [02/12/2021 - AdvancedSetup]

The following MBST tool should be used to perform a clean removal and reinstall



Edited by AdvancedSetup
updated information
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Thank you for your prompt reply, Ron.  I have done as you asked and ran the MBAM_Clean tool; report attached.

I will monitor the Custom Scan issue; and, if it recurs, I will submit the logs that you have requested.  I am not really concerned about it.  I thought it might be an "undocumented" feature! ;)

Thank you again for your speedy attention to my post.  Have a great weekend.



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