Microsoft Edge Extension Malware

[John2256]

Hi everyone,

I'm new to the forum and have been searching through trying to find out if MB is capable of detecting malicious activity from browser extensions.  From what I can tell it might be, but I coulnd't find any information about the extension that was on my machine.  I had an extension called Youtube Download Toolkit installed from the MS edge store.  MS recently disabled it and I got a message saying it was because it contained malware.  I've not been able to find details of what it did or whether MB is capable of detecting / removing anything malicious it might have installed.  Please can I ask for some advice as to what would be the best actions to take?  MB is installed on my machine along with browser guard.  It isn't picking up any malicious activity from regular scans or browsing.  I can also see that the malicious extension, although removed from the MS extension store, is still available on github for download.  I can supply the link if it's helpful.

Thank you for any and all advice! 

[Maurice Naggar]

Hello @John2256

I will guide you. These are just first steps. I do not have first or second-hand experience as to the browser extension.

Let's do one scan with Malwarebytes Adwcleaner to check for adwares. Just before pressing that "scan" button, be sure that Chrome & Edge, or other web browser are Closed.

It will not take much time, But do read all of this write-up first so that you fully understand the concept of this special run.

First download & save it
guide & download link

Then be sure to close all web browsers after the download & before launching the tool.

Then go to where the EXE file is saved. Start Adwcleaner.
Reply YES at the Windows prompt to allow the program to proceed and make changes. That is the usual Windows security prompt.

Take your time and go careful. There are some preliminary selections to be set ....before pressing any 'scan' button.

When AdwCleaner starts, on the left side of the window, click on “Settings” and then enable these repair actions on that tab-window
by clicking their button to the far-right for ON status

Delete IFEO keys
Delete tracing keys
Delete Prefecth files
Reset Proxy
Reset IE Policies
Reset Chrome policies
Reset Winsock

Now On the left side of the AdwCleaner window, click on “Dashboard” and then click “Scan” to perform a computer scan.

This can take several minutes.
When the AdwCleaner scan is completed it will display all of the items it has found. Click on the “Quarantine” button To remove what it found.

AdwCleaner will now prompt you to save any open files or data as the program will need to close any open programs before it starts to clean. 
Click on the “Continue” button to finish the removal process.

Guide article

Attach the clean log from Adwcleaner when all completed.

[John2256]

Thanks so much for your reply.  I've just followed the instructions above, and from what I can see it doesn't look too bad!  I've attached the log here.  Thank you for any guidance!!  

 

AdwCleaner[C00].txt

[Maurice Naggar]

Good run. It did find some adwares. Next steps.

Please  set File Explorer to SHOW ALL folders, all files, including Hidden ones.  Use OPTION ONE or TWO of this article
Please use this Guide

We need to do more scanning. This here you can start & once it is under way, you can leave the machine alone & let it run over-night. No need to keep watch once it starts the actual scan run. 

Next, This will be a check with ESET Onlinescanner for viruses, other malware, adwares, & potentially unwanted applications.

Go to https://download.eset.com/com/eset/tools/online_scanner/latest/esetonlinescanner.exe

 

It will start a download of "esetonlinescanner.exe"

• Save the file to your system, such as the Downloads folder, or else to the Desktop.
• Go to the saved file, and double click it to get it started.

 

• When presented with the initial ESET options, click on "Computer Scan".
• Next, when prompted by Windows, allow it to start by clicking Yes
• When prompted for scan type, Click on Full scan

Look at & tick ( select ) the radio selection "Enable ESET to detect and quarantine potentially unwanted applications" and click on Start scan button.

• Have patience. The entire process may take an hour or more. There is an initial update download.

There is a progress window display. You may step away from machine &. Let it be.  That is, once it is under way, you should leave it running.  It will run for several hours.

• At screen "Detections occured and resolved" click on blue button "View detected results"
• On next screen, at lower left, click on blue "Save scan log"
• View where file is to be saved. Provide a meaningful name for the "File name:"
• On last screen, set to Off (left) the option for Periodic scanning
• Click "save and continue"
• Please attach the report file so I can review

[John2256]

Thank you once again.  Please see attached results. Note - I have dropbox installed but a large majority of files are not synced to my PC.  I noticed the application was running slow and it seemed to be downlading all of my synced files before scanning them.  So I paused the scan, shut down dropbox, and then resumed.  

Thank you again for any advice 🙂

Eset Scan Log.txt

[Maurice Naggar]

ESET Online found and removed 4 threats. This will be another scan, using a different scan tool. 

This with Kaspersky KVRT tool.

Download Kaspersky Virus Removal Tool (KVRT) from here: https://www.kaspersky.com/downloads/thank-you/free-virus-removal-tool and save to your Desktop.

Next, Select the Windows Key and R Key together, the "Run" box should open.



Drag and Drop KVRT.exe into the Run Box.



C:\Users\{your user name}\DESKTOP\KVRT.exe will now show in the run box.



add 

-dontencrypt

 Note the space between KVRT.exe and -dontencrypt

C:\Users\jelmo\DESKTOP\KVRT.exe -dontencrypt 

should now show in the Run box.



That addendum to the run command is very important.


To start the scan select OK in the "Run" box.



The Windows Protected your PC window will open, select "More Info"



A new Window will open, select "Run anyway"



A EULA window will open, tick both confirmation boxes then select "Accept"



In the new window select "Change Parameters"

 

• In the new window ensure the following boxes are ticked:
  • System memory
  • Startup objects
  • Boot sectors
  • System drive

• Then select "OK" and „Start scan“.

The Kaspersky tool is very thorough so will take a considerable time to complete, please allow it to finish. Also while Kaspersky runs do not use your PC for anything else..

• completed: If entries are found, there will be options to choose. If "Cure" is offered, leave as it is. For any other options change to "Delete", then select "Continue".
• Usually, your system needs a reboot to finish the removal process.
• Logfiles can be found on your systemdrive (usually C: ), similar like this:

Reports are saved here C:\KVRT_data\Reports and look similar to this report_20221113_103821.klr

• Right click direct onto those reports, select > open with > Notepad.
• Save the files and attach them with your next reply

[John2256]

Thank you again.  Just ran it now and from what I can see the only infection was an old backup file from a website.  It was actually downloaded from my dropbox when I ran the ESET scanner, so I probably need to check all my dropbox files.  Here's the report.  Thank you for your advice.

KVRT Report.txt

[Maurice Naggar]

Alright. Thank you. The Microsoft Safety Scanner is a free Microsoft stand-alone virus scanner that can be used to scan for & remove malware or potentially unwanted software from a system. 

The download links & the how-to-run-the tool are at this link at Microsoft 

https://docs.microsoft.com/en-us/windows/security/threat-protection/intelligence/safety-scanner-download

 

Look on Scan Options & select  CUSTOM scan  & then select the C drive to be scanned.

Then start the scan. Have lots of patience. Once you start the scan & you see it started, then leave it be.  

• Once you see it has started, take a long long break;  walk away.  Do not pay credence if you see some intermediate early flash messages on screen display.  The only things that count are the End result at the end of the run.
• Again, any on-screen display about repeat 'infection' is not to be relied on.  Ignore those.
• We only rely on the end result that is on the log-report-file.

 

This is likely to run for many hours   ( depending on number of files on your machine & the speed of hardware.)

The log is named MSERT.log  

the log will be at  

Windows\debug\msert.log

Please attach that log with your reply. 

[John2256]

Hi there,

I think things are looking good.  Please see attached.  Thank you for your continued help!

 

msert.log

[Maurice Naggar]

Bravo. 

Results Summary:
----------------
No infection found.

I would like a report set for review.   This is a report only.

Please download MALWAREBYTES MBST Support Tool

Once you start it click Advanced >>> then   Gather Logs

 Have patience till the run has finished.

Upload an archive once it is done. Attach the mbst-grab-results.zip from the Desktop.

• Please attach  mbst-grab-results.zip    to your reply

[Maurice Naggar]

Due to the lack of feedback, this topic is closed to prevent others from posting here.

If you need this topic reopened, please send a Private Message to any one of the moderating team members. Please include a link to this topic with your request.

This applies only to the originator of this topic. Other members who need assistance please start your own topic in a new thread.

Tips to help protect from infection

Thanks