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How to Know Which Malware I run from SCR file


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Hello everyone!

The other day I naively double clicked on a .SCR file that I assumed was a video since it had a VLC icon.
A progress bar showed up and disappeared almost imemdiately, I couldn't read what was written on it. 
VLC didn't open up and when I relized what I did, I turned off the laptop wifi, the connection was up for about 30 secs - 1 minute.

After that I kept the laptop offline, deleted the SCR file and run different Antivirus and Malware removal tools which couldn't find anything.
I reinstalled Windows10, formatted the C: partion only, left the D: partion with just data untouched, D: is where the SCR file was.

I was wondering if there was a way to figure out which Virus/Malware I run, just to understand if I should worry and take additional precautions.

To give more context, this happened on an old laptop with Windows10 Pro reinstalled and fully updated one week ago before going on a short vacation. 
I was only running Windows Defender as antivirus.

I was trying to download a video with uTorrent, the torrent was about 3GB, in the torrent root folder there was the SCR file and the actual video in a subfolder.
An interesting detail is that when I double cliked on the SCR file, it wasn't fully downloaded/completed, because there weren't peers hosting the SCR file at 100%.
I checked the torrent again and there are still no peers with the SCR file completed, the file is 708MB, only 97.7% available so ~692MB.
However when uTorrent starts to download a file, it preallocates space for the full file.
So I double clicked on SCR file with the full preallocated size, but only partially downloaded, most probably at 97.7%.
This might not really matter since I expect that the Malware bytecode lies in the first few MBs of the file, all the rest is probably garbage data used to bloat the file size and make it look like the file has the size of an ordinary video. 
 
Fortunately I didn't have much installed on the laptop:
- I never used this laptop to access sensitive sites like google accounts or bank, and additionally I don't save account info in the browsers
- Steam and Epic apps installed with saved credentials 
- A few Windows Remote Desktop connections saved inside a desktop folder.
- 2 different VPN apps with credentials 
- On the D: data drive some old PDFs with things like flight tickets, random mp3 and video files, and an old excel spread sheet with old login credentials probably all invalid (the spread sheet is password "protected")  
 
 If it helps I could redownload the SCR file.
 
 Thanks!

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  • Root Admin

Hello  and  :welcome:     @Basilisk

 

My screen name is AdvancedSetup and I will assist you with your system issues.
 

Let's keep these principles as we proceed. Make sure to read the entire post below first.

  • Please follow all steps in the provided order and post back all requested logs
  • Please attach all log files to your post, unless otherwise requested
  • Temporarily disable your antivirus or other security software first. Make sure to turn it back on once the scans have been completed.
  • Temporarily disable Microsoft SmartScreen to download the software below if needed. Make sure to turn it back on once the scans are completed.
  • Searching, detecting, and removing malware isn't instantaneous and there is no guarantee to repair every system.
  • Before we start, please make sure that you have an external backup, not connected to this system, of all private data.
  • Do not run online games while the case is ongoing. Do not do any free-wheeling or risky web-surfing.
  • Only run the tools I guide you to use. Please don't run any other scans, download, install or uninstall any programs while I'm working with you.
  • Cracked, Hacked, or Pirated programs are not only illegal but also can make a computer a malware victim. Having such programs installed is the easiest way to get infected. It is the leading cause of ransomware encryption. It is at times also a big source of current Trojan infections. If there are any on the system you should uninstall them before we proceed.
  • Please be patient and stick with me until I give you the "all clear". We don't want to waste your time, please don't waste ours.
  • If your system is running Discord, please be sure to Exit it while this case is ongoing.

 

Generally speaking we don't always track down the specific infection you have as we don't run a forensics analysis service. We check for malware and provide assistance in removing it.

 

To begin, please do the following so that we may take a closer look at your installation for troubleshooting. This is a report only.

NOTE: The tools and the information obtained are safe and not harmful to your privacy or your computer, please allow the programs to run if blocked by your system.

  • Download the Malwarebytes Support Tool
  • In your Downloads folder, open the mb-support-x.x.x.xxx.exe file
  • In the User Account Control pop-up window, click Yes to continue the installation
  • Run the MBST Support Tool
  • In the left navigation pane of the Malwarebytes Support Tool, click Advanced
  • In the Advanced Options, click Gather Logs. A status diagram displays the tool is Getting logs from your machine
  • A zip file named mbst-grab-results.zip will be saved to the Public desktop, please upload that file on your next reply

Thank you

 

 

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Hi @AdvancedSetup !

Thanks for taking the time to look into my issue.

I mentioned in my initial message I have already formatted C: and reinstalled Windows, but I guess there are malwares that can survive that :(

As you said I was probably more looking for a "forensics analysis service" instead, to asses if there are any additional measures I should be taking.
Did I post in the wrong place?
If that's the case I am sorry.

However, to be extra safe,  I run the Malwarebytes Support Tool as requested, and attached the results.

Thanks!

mbst-grab-results.zip

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  • Root Admin

Well, it would appear that something has blocked some of the diagnostics logs from downloading.

Please do the following @Basilisk

 

 

Please download Farbar Recovery Scan Tool and save it to your desktop.

Note: You need to run the version compatible with your system.
You can check here if you're not sure if your computer is 32-bit or 64-bit

  • Double-click to run it. When the tool opens click Yes to disclaimer.
  • Press the Scan button.
  • It will make a log (FRST.txt) in the same directory the tool is run. Please attach it to your reply.
  • The first time the tool is run, it also makes another log (Addition.txt). Please attach it to your reply as well.

Thank you

 

 

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  • Root Admin

Did you disconnect the Internet when you ran the scan?

DNS Servers: Media is not connected to internet.

 

Please enable System Protection and create a new System Restore Point

ATTENTION: System Restore is disabled (Total:112.39 GB) (Free:75.19 GB) (67%)

 

You appear to be missing some Device Drivers?

==================== Faulty Device Manager Devices ============

Name: Base System Device
Description: Base System Device
Class Guid:
Manufacturer:
Service:
Problem: : The drivers for this device are not installed. (Code 28)
Resolution: To install the drivers for this device, click "Update Driver", which starts the Hardware Update wizard.

Name:
Description:
Class Guid:
Manufacturer:
Service:
Problem: : The drivers for this device are not installed. (Code 28)
Resolution: To install the drivers for this device, click "Update Driver", which starts the Hardware Update wizard.

 

 

 

Then you also have the following additional errors on the system, from the Event Logs

 

System errors:
=============
Error: (11/21/2022 11:22:01 PM) (Source: Service Control Manager) (EventID: 7031) (User: )
Description: The Microsoft Office Click-to-Run Service service terminated unexpectedly.  It has done this 1 time(s).  The following corrective action will be taken in 0 milliseconds: Restart the service.

Error: (11/21/2022 11:22:01 PM) (Source: Service Control Manager) (EventID: 7034) (User: )
Description: The NVIDIA Display Driver Service service terminated unexpectedly.  It has done this 1 time(s).

Error: (11/21/2022 07:47:46 PM) (Source: Microsoft-Windows-Kernel-Power) (EventID: 137) (User: )
Description: 4

Error: (11/21/2022 02:51:27 PM) (Source: Microsoft-Windows-Kernel-Power) (EventID: 137) (User: )
Description: 4

Error: (11/21/2022 02:10:19 PM) (Source: DCOM) (EventID: 10010) (User: NT AUTHORITY)
Description: The server {4EB61BAC-A3B6-4760-9581-655041EF4D69} did not register with DCOM within the required timeout.

Error: (11/20/2022 04:16:54 AM) (Source: Service Control Manager) (EventID: 7000) (User: )
Description: The Steam Client Service service failed to start due to the following error:
The service did not respond to the start or control request in a timely fashion.

Error: (11/20/2022 04:16:54 AM) (Source: Service Control Manager) (EventID: 7009) (User: )
Description: A timeout was reached (30000 milliseconds) while waiting for the Steam Client Service service to connect.

Error: (11/20/2022 02:14:59 AM) (Source: Microsoft-Windows-WindowsUpdateClient) (EventID: 20) (User: NT AUTHORITY)
Description: Installation Failure: Windows failed to install the following update with error 0x80240017: Update for Windows Defender Antivirus antimalware platform - KB4052623 (Version 4.18.2001.10).

 

 

 

BIOS: American Megatrends Inc. R0280Y6 05/14/2010
Motherboard: Sony Corporation VAIO

 

 

I don't see an obvious infection, but the computer is suffering multiple software issues.

Let me have you temporarily uninstall ALL Avast software. Then restart the computer and get me new Farbar logs

You will still have Windows Defender for security protection

 

 

Thank you

 

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Hi @AdvancedSetup

I uninstalled Avast and rerun FarBar as requested.

About the few things you pointed out from the previous results:

>>Did you disconnect the Internet when you ran the scan?
This time I left the wifi connection on during the scan.

>>Please enable System Protection and create a new System Restore Point
I turned on the System Restore for the C: drive.
I have never used this windows feature, if something breaks or goes wrong I just prefer to format and do a clean install (like in this case),
maybe there's some additional benefit with the System Restore that I don't know of. 

>>You appear to be missing some Device Drivers?
Yes, this is an old Sony Vaio laptop, Sony stopped making laptops and unfortunately on there website I couldn't find win10 specific drivers.
The device manager and WinUpdate cannot find drivers for them.
There are a bunch of unofficial websites that claim to have win10 drivers, however since everything seems to run fine so far, I preferred not to download them.

>>Then you also have the following additional errors on the system, from the Event Logs
Since the last scan there's only one new event error related to Microsoft.XboxGamingOverlay, I guess not a big concern

Thanks for the help!

FRST.txt Addition.txt

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  • Root Admin

The System Restore can come in pretty handy by allowing a back in time restore in case you installed something or removed something that broke Windows and you were having issues fixing it. Much faster than a full reinstall.

[ 1 ]

Your DNS Servers: 192.168.1.1

Please consider changing your default DNS Server settings. Please choose one provider only

DNS is what lets users connect to websites using domain names instead of IP addresses

  • Google Public DNS: IPv4   8.8.8.8 and 8.8.4.4   IPv6   2001:4860:4860::8888 and 2001:4860:4860::8844
  • Cloudflare: IPv4   1.1.1.1 and 1.0.0.1   IPv6   2606:4700:4700::1111 and 2606:4700:4700::1001
  • OpenDNS: IPv4   208.67.222.222 and 208.67.220.220  IPv6  2620:119:35::35 and 2620:119:53::53
  • DNSWATCH: IPv4   84.200.69.80 and 84.200.70.40   IPv6  2001:1608:10:25::1c04:b12f and 2001:1608:10:25::9249:d69b

The Ultimate Guide to Changing Your DNS Server
https://www.howtogeek.com/167533/the-ultimate-guide-to-changing-your-dns-server/

Here is a YouTube video on Changing DNS settings if needed

 

[ 2 ]

Please run the following fix

Once the fix has been completed, please attach the file FIXLOG.TXT to your next reply

 

Please download the attached fixlist.txt file and save it to the Desktop or location where you ran FRST from.
NOTE. It's important that both files, FRST or FRST64, and fixlist.txt are in the same location or the fix will not work.

Please make sure you disable any real-time antivirus or security software before running this script. Once completed, make sure you re-enable it.

NOTICE: This script was written specifically for this user, for use on this particular machine. Running this on another machine may cause damage to your operating system that cannot be undone.

Run FRST or FRST64 and press the Fix button just once and wait.
If the tool needs a restart please make sure you let the system restart normally and let the tool complete its run after restart.
The tool will make a log on the Desktop (Fixlog.txt) or wherever you ran FRST from. Please attach or post it to your next reply.

Note: If the tool warned you about an outdated version please download and run the updated version.

NOTE-1:  This fix will run a scan to check that all Microsoft operating system files are valid and not corrupt and attempt to correct any invalid files. It will also run a disk check on the restart to ensure disk integrity. Depending on the speed of your computer this fix may take 30 minutes or more.

NOTE-2: As part of this fix all temporary files will be removed. If you have any open web pages that have not been bookmarked please make sure you bookmark them now as all open applications will be automatically closed. Also, make sure you know the passwords for all websites as cookies will also be removed. The use of an external password manager is highly recommended instead of using your browser to store passwords.

NOTE-3: As part of this fix it will also reset the network to default settings including the firewall. If you have custom firewall rules you need to save please export or save them first before running this fix.

The following directories are emptied:

  • Windows Temp
  • Users Temp folders
  • Edge, IE, FF, Chrome, and Opera caches, HTML5 storages, Cookies and History
  • Recently opened files cache
  • Discord cache
  • Java cache
  • Steam HTML cache
  • Explorer thumbnail and icon cache
  • BITS transfer queue (qmgr*.dat files)
  • Recycle Bin

Important: items are permanently deleted. They are not moved to quarantine. If you have any questions or concerns please ask before running this fix.

The system will be rebooted after the fix has run.

fixlist.txt

Thanks

 

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I didn't know I had to manually set the DNS server, I assumed Chrome automatically used the Google one. Thanks for the tutorial links!

Thanks for the fixlist batch, this looks like a deep clean and reboot script.
Do you think I should be running this because you saw something fishy going on in the logs, or it's just a rootine clean up?
I wouldn't expect that a deep clean was necessary after a fresh Win10 install, unless somehow the Malware is still hiding somewhere. 
I am sorry for asking you this, I just wanted to get a better understand of what is going on before running the script :P


 

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I didn't know I had to manually set the DNS server, I assumed Chrome automatically used the Google one. Thanks for the tutorial links!

Thanks for the fixlist batch, this looks like a deep clean and reboot script.
Do you think I should be running this because you saw something fishy going on in the logs, or it's just a rootine clean up?
I wouldn't expect that a deep clean was necessary after a fresh Win10 install, unless somehow the Malware is still hiding somewhere. 
I am sorry for asking you this, I just wanted to get a better understand of what is going on before running the script :P


 

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  • Root Admin

Thank you, that was a good run. Windows found and fixed some issues. @Basilisk

Windows Resource Protection found corrupt files and successfully repaired them.

 

 

Please run the following ESET Online Scanner and perform a Full Scan

 

Click the following link to save the installer for ESET Online Scanner

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 started. 
  • When presented with the initial ESET screen, click on "Get Started". Read and accept the Terms of use
  • On the "Before we start..." screen chose if you want to send anonymous data and if you want to provide feedback or not, then click Continue
  • When prompted for scan type, Click on the Full Scan button
  • Enable  ( select )   the radio selection "Enable ESET to detect and quarantine potentially unwanted applications"   and click the Start scan button.
  • Have patience.  The entire process may take a few hours or more.
  • When the scan is completed, if something was found, it will show a screen with the number of detected items.  If so, click the button marked “View detected results”.
  • Click The blue “Save scan log” to save the log and give it a name and location you remember.
  • If something was removed and you know it is a false postive, you may click on the blue ”Restore cleaned files”  ( in blue, at the bottom).
  • Press Continue when all done.  You should click to turn off the offer for “periodic scanning”.
  • Enable "Delete application data on closing" - You do not need to submit feedback unless you want to. Simply ignore and close the program.

 

Note: If you do need to do a File Restore from ESET please follow the directions below

[KB2915] Restore files quarantined by the ESET Online Scanner version 3

https://support.eset.com/en/kb2915-restore-files-quarantined-by-the-eset-online-scanner

 

Please attach the ESET scan log you saved at the end to your next reply

 

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Hi @AdvancedSetup

Thanks for the additional steps.

Are corrupted files in the FRST fix script a potential sign of Malwares? 

Anyways I run a full scan with ESET as instructed, it took a couple of hours to complete.

Based on the scan log it only detected the original SCR file that started all this.  

It was identified as a variant of Win32/Packed.CAB.DE, I googled for it but didn't find an exact match, just similar ones like Win32/Packed.CAB.AE which seem to be a ransomware.

eset_scan_log.txt

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  • Root Admin

The corrupted files is a normal issue that happens to all Windows computer. Even my own computer will get settings or files corrupted. I run the System File  Checker on my own system every so often and sometimes it finds issues and fixes them.

The ESET file was good but I bet it left the folder behind. If it did then you can delete it.

D:\_virus

Let's run one more from Microsoft again to make sure. @Basilisk

 

 

Microsoft Safety Scanner

Please make sure you Exit out of any other program you might have open so that the sole task is to run the following scan.   
That goes especially for web browsers, make sure all are fully exited out of and messenger programs are exited and closed as well
 

STEP 1

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

https://www.tenforums.com/tutorials/7078-turn-off-show-all-folders-windows-10-navigation-pane.html

STEP 2

I suggest a new scan for viruses & other malware. This may take several hours, depending on the number of files on the system and the speed of the computer.

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 the Scan Options & select the FULL scan.

Then start the scan. Have lots of patience. It may take several hours.

  • 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 the screen display.  The only things that count are the End result at the end of the run.
  • The scan will take several hours.  Leave it alone. It will remove any other remaining threats as it goes along.  Take a very long break, do your normal personal errands .....just do not use the computer during this scan.

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

The log is named MSERT.log  and the log will be at C:\Windows\debug\msert.log

Please attach that log with your next reply.

 

 

It is normal for the Microsoft Safety Scanner to show detections during the scan process. It is scanning for basically all bread crumbs or traces of files and registry entries that "might" be or have been part of some infection or previous infection.

That DOES NOT mean the computer is infected. Once the scan has been completed it uploads the log to their Cloud service which then uses Artificial Intelligence to determine if in fact any of the traces are an infection or not.

Then it writes into the log on your computer what it found.

 

Thanks

 

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  • Root Admin

I don't know why you'd still have it on your system. I would delete it.

 

Please run the following steps and post back the logs as an attachment when ready.
Temporarily disable your antivirus or other security software first. Make sure to turn it back on once the scans are completed.
Temporarily disable Microsoft SmartScreen to download software below if needed. Make sure to turn it back on once the scans are completed.
If you still have trouble downloading the software please click on Reveal Hidden Contents below for examples of how to allow the download.

 

Spoiler
 
 
 
 
Spoiler

When downloading with some browsers you may see a different style of screens that may block FRST from downloading. The program is safe and used hundreds of times a week by many users.

Example of Microsoft Edge blocking the download

image.png

image.png

image.png

 



STEP 01

  • If you already have Malwarebytes installed then open Malwarebytes and click on the Scan button. It will automatically check for updates and run a Threat Scan.
  • If you don't have Malwarebytes installed yet please download it from here and install it.
  • Once installed then open Malwarebytes and select Scan and let it run.
  • Once the scan is completed make sure you have it quarantine any detections it finds.
  • If no detections were found click on the Save results drop-down, then the Export to TXT  button, and save the file as a Text file to your desktop or other location you can find and attach that log on your next reply.
  • If there were detections then once the quarantine has completed click on the View report button, Then click the Export drop-down, then the Export to TXT  button, and save the file as a Text file to your desktop or other location you can find and attach that log on your next reply.
  • If the computer restarted to quarantine you can access the logs from the Detection History, then the History tab. Highlight the most recent scan and double-click to open it. Then click the Export drop-down, then the Export to TXT  button, and save the file as a Text file to your desktop or other location you can find and attach that log on your next reply.
  • If Malwarebytes won't run then please skip to the next step and let me know in your next reply that the scanner would not run.

STEP 02

Please download AdwCleaner by Malwarebytes and save the file to your Desktop.

  • Double-click to run the program
  • Accept the End User License Agreement.
  • Wait until the database is updated.
  • Click Scan Now.
  • When finished, if items are found please click Quarantine.
  • Your PC should reboot now if any items were found.
  • After reboot, a log file will be opened. Attach or Copy its content into your next reply.

RESTART THE COMPUTER Before running Step 3

STEP 03
Please download the Farbar Recovery Scan Tool and save it to your desktop.

Note: You need to run the version compatible with your system. You can check here if you're not sure if your computer is 32-bit or 64-bit

  • Double-click to run it. When the tool opens, click Yes to disclaimer.
  • Press the Scan button.
  • It will make a log (FRST.txt) in the same directory the tool is run. Please attach it to your reply.
  • The first time the tool is run, it also makes another log (Addition.txt). If you've, run the tool before you need to place a check mark here each time
  • Please attach the Additions.txt log to your reply as well.
  • On your next reply, you should be attaching frst.txt and additions.txt to your post, every time.

 

Thanks

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  • Root Admin

Not that you have to change it, but your DNS still shows it has not been changed.

You DNS Servers: 192.168.1.1

 

Not sure why, but your Nvidia driver appear to be faulting

Error: (11/25/2022 11:29:20 PM) (Source: Service Control Manager) (EventID: 7034) (User: )
Description: The NVIDIA Stereoscopic 3D Driver Service service terminated unexpectedly.  It has done this 1 time(s).

Error: (11/25/2022 11:29:20 PM) (Source: Service Control Manager) (EventID: 7034) (User: )
Description: The NVIDIA Display Driver Service service terminated unexpectedly.  It has done this 1 time(s).

 

 

Logs show the computer to be pretty clean and sparse of unwanted services or programs.

Unless there is something else, we should be done here now

 

 

 

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Hi @AdvancedSetup!
 
I installed the NVidia drivers through Windows update, I'll try to download the latest version from the NVidia website and do a clean install,
it's also possible that this laptop and graphics card are so old that the latest drivers don't work well.

It's great to know that the pc is clean and nothing is hiding in the disk.

I have just a few questions before closing:
- Should I run the Farbar fixlist again after a fresh Win10 install ?
- I was just wondering if you could point me to other tools or recourses that could identify the Malware in the SCR file.

Thanks a lot for guiding me through each step and having the patience to assist me with this problem!

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  • Root Admin

No, one should never just run a FIXLIST on any system. You should ensure it's specifically for your system or one that is generic for basic temp clean up stuff

If you upload the file to https://virustotal.com they should be able to tell you more about it than most places.

 

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  • Root Admin

Let's go ahead and do some clean-up work and remove the tools and logs we've run.

Please download KpRm by kernel-panik and save it to your desktop.

  • right-click kprm_(version).exe and select Run as Administrator.
  • Read and accept the disclaimer.
  • When the tool opens, ensure all boxes under Actions are checked.
  • Under Delete Quarantines select Delete Now, then click Run.
  • Once complete, click OK.
  • A log will open in Notepad titled kprm-(date).txt.
  • Please attach that file to your next reply. (not compulsory)

 

  1. Recommend using a Password Manager for all websites, etc. that require a password. Never use the same password on more than one site.
    https://www.howtogeek.com/240255/password-managers-compared-lastpass-vs-keepass-vs-dashlane-vs-1password/
  2. Make sure you're backing up your files https://forums.malwarebytes.com/topic/136226-backup-software/
  3. Keep all software up to date - PatchMyPC - https://patchmypc.com/home-updater#download
  4. Keep your Operating System up to date and current at all times - https://support.microsoft.com/en-us/windows/windows-update-faq-8a903416-6f45-0718-f5c7-375e92dddeb2
  5. Further tips to help protect your computer data and improve your privacy: https://forums.malwarebytes.com/topic/258363-tips-to-help-protect-from-infection/ 
  6. Please consider installing the following Content Blockers for your Web browsers if you haven't done so already. This will help improve overall security

Malwarebytes Browser Guard

uBlock Origin

 

Further reading if you like to keep up on the malware threat scene: Malwarebytes Blog  https://blog.malwarebytes.com/

Hopefully, we've been able to assist you with correcting your system issues.

Thank you for using Malwarebytes

 

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