Avoid downloading fake updates promoted by mainsourceofupgrade.best

Also Known As: mainsourceofupgrade.best pop-up
Type: Mac Virus
Distribution: Low
Damage level: Medium

How to remove redirect to mainsourceofupgrade[.]best from Mac computers

What is mainsourceofupgrade[.]best?

mainsourceofupgrade[.]best (or mainsourceoffreeupgrade.best) is a deceptive web page designed to encourage visitors into downloading/installing a fake Flash Player updater. This scam is furthered by claims that Adobe Flash Player is out of date. Rogue updaters are typically used to proliferate Potentially Unwanted Applications (PUAs), malware (e.g. trojans, ransomware), and other high-risk malicious content. Most visitors to mainsourceofupgrade[.]best enter it unintentionally - they are redirected to it by intrusive advertisements or PUAs already infiltrated into the device.

mainsourceofupgrade[.]best scam

Once accessed, mainsourceofupgrade[.]best first displays several pop-up windows. The top of the page includes a tagline-like window, which states that the latest version of Flash Player is necessary to enable audio media (i.e., encode and/or decode audio files). It urges users to click a highlighted download link of the fake updater. The pop-up at the bottom informs visitors that, to continue watching, they need to install the latest Adobe Flash Player version. The window displayed in the center of the web page recommends an update for online streaming and viewing purposes. It also adds that no restart is needed to install these updates. Flash Player is an essential browser plug-in that enables a wide variety of media and, as it is allegedly missing the latest security updates, has been blocked. Therefore, users are instructed to download an updated version to continue use. The mainsourceofupgrade[.]best website presents another pop-up, which overlays the one described above. This window contains virtually identical text to the overlaid pop-up, however, rather than definitively stating that Adobe Flash Player is outdated, it suggests that it "might" be out of date. After any of the download/install buttons are clicked, mainsourceofupgrade[.]best gives instructions about how to install the updates. Firstly, users must open their downloads list. Secondly, they are to locate and double-click a file beginning with the words "Flash Player". Lastly, they must run the application and follow the instructions provided by the update installer. Trusting mainsourceofupgrade[.]best will not result in visitors updating Adobe Flash Player, instead they will allow untrustworthy and/or potentially malicious content onto their systems. Sites proclaiming that a crucial piece of software is outdated/missing cannot be trusted. You are strongly advised against downloading, installing or purchasing content endorsed in this manner.

As mentioned, deceptive/scam sites are often force-opened by PUAs. Unwanted applications possess many dangerous capabilities, including generating redirects to dubious web pages. Fake system cleaners/optimizers also belong to this category. This type requires activation to work (i.e., they must be purchased to perform their advertised functions). Even after activation, however, they remain nonoperational. Other PUAs can run intrusive ad campaigns. Therefore, they deliver unwanted and harmful ads. Another kind can make unauthorized changes to browsers and limit/deny access to settings. Most PUAs also have data-tracking capabilities, regardless of their specific type. They can record browsing activity (browsing and search engine histories) and collect users' personal information (IP addresses, geolocations and other details). This private data might then be shared with third parties seeking to profit by putting it to criminal use. In summary, PUAs can cause browser/system infiltration and infections and lead to serious privacy issues, financial loss and even identity theft. To ensure device and user safety, remove all suspect applications and browser extensions/plug-ins immediately upon detection.

Threat Summary:
Name mainsourceofupgrade.best pop-up
Threat Type Phishing, Scam, Mac malware, Mac virus.
Fake Claim Site claims that the visitor's Flash Player is outdated.
Detection Names (fake updater)
Avast (Other:Malware-gen [Trj]), BitDefender (Adware.MAC.Bundlore.DPS), Kaspersky (HEUR:Trojan-Downloader.OSX.Shlayer.a), Ikarus (Trojan-Downloader.OSX.Shlayer), Full List (VirusTotal)
Promoted Unwanted Application Site promotes fake software updates.
Symptoms Your Mac becomes slower than normal, you see unwanted pop-up ads, you are redirected to dubious websites.
Distribution methods Deceptive pop-up ads, free software installers (bundling), fake Flash Player installers, torrent file downloads.
Damage Internet browser tracking (potential privacy issues), display of unwanted ads, redirects to dubious websites, loss of private information.
Malware Removal (Mac)

To eliminate possible malware infections, scan your Mac with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
▼ Download Combo Cleaner for Mac
To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.

yourfine2updatesgo.bestmainsourceofupdate.best, and centersourceoffreeupgrade.best are some examples of other scams practically identical to mainsourceofupgrade[.]best. There are many schemes run on deceptive web pages. For example, fake claims about outdated/missing software, alerts about threats/issues detected on the device, 'amazing' offers and prize announcements, and so on. The aim of these scams is to trick visitors into downloading/installing/purchasing dubious and/or malicious content, making expensive calls, transferring money, revealing sensitive information, etc. The underlying purpose of these deceptive websites is to generate revenue for their designers at users' expense.

How did potentially unwanted applications install on my computer?

PUAs typically infiltrate devices without users' consent. They can be installed via fake updaters or downloaded/installed together with normal software. This deceptive marketing method is called "bundling". By rushing through download/install processes (e.g. ignoring terms, skipping steps and sections, etc.), many users increase the risk of inadvertently allowing bundled content onto devices. When clicked, intrusive advertisements can execute scripts designed to stealthily download/install PUAs.

How to avoid installation of potentially unwanted applications

You are strongly advised to research all content, prior to downloading/installing. Use only official and verified download sources. Untrustworthy download channels such as P2P sharing networks (BitTorrent, Gnutella, eMule, etc.), free file-hosting sites and other third party downloaders are more likely to offer bundled software. When downloading/installing, read the terms, study all available options, use "Custom/Advanced" settings and opt-out of supplementary apps, tools, features, etc. Intrusive ads often seem normal and innocuous, however, they cause redirects to dubious web pages, such as gambling, pornography, adult-dating and similar. If you encounter these ads/redirects, inspect the system and remove all dubious applications and/or browser extensions/plug-ins without delay. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

Text presented in the initial pop-up windows:

Upper pop-up:

 

Latest version of Flash Player is required to encode and/or decode (Play) audio files in high quality. - Click here to update for latest version.

-----

 

Bottom pop-up:

 

Flash Player Update
Install latest version of Adobe Flash Player in order to continue watching.
Download

-----

 

Center pop-up:

 

Software update
Recommended Update
For streaming and online watching
Update now

Software Update
This update is recommended and no restart is needed


"Adobe Flash Player" is an essential plugin for your browser that allows you to view everything from video to games and animation on the web. The version of “Adobe Flash Player" on your system does not include the latest security updates and has been blocked.

To continue using “Adobe Flash Player", download an updated version.
Update Download Flash...

Screenshot of the overlaying pop-up:

mainsourceofupgrade[.]best scam second page

Text presented in this pop-up:

Software Update
This update is recommended and no restart is needed

“Adobe Flash Player” might be out-of-date
The version of this plug-in on your computer might not include the latest security updates. Flash might not work until you download an update from Adobe.
Download Flash...

Screenshot of installation instructions for the fake updates provided by mainsourceofupgrade[.]best:

mainsourceofupgrade[.]best scam third page instructions

Text presented in this page:

1
Go to the ‘Downloads’
Open your downloads list by
clicking on the top right corner
the ‘arrow’.

2
Open the file
Locate and double-click the file
starting with ‘Flash Player’.

3
Run the application
Confirm the installation by clicking
Continue and Install
buttons.
Type your password.

Appearance of mainsourceofupgrade[.]best scam (GIF):

Appearance of mainsourceofupgrade[.]best scam (GIF)

Screenshot of the fake Flash Player updater installation setup:

mainsourceofupgrade[.]best scam fake flash player installer

Instant automatic Mac malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of Mac malware. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner for Mac By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.

Quick menu:

Video showing how to remove unwanted applications promoted via mainsourceofupgrade[.]best scam website using Combo Cleaner:

Potentially unwanted applications removal:

Remove potentially unwanted applications from your "Applications" folder:

mac browser hijacker removal from applications folder

Click the Finder icon. In the Finder window, select "Applications". In the applications folder, look for "MPlayerX","NicePlayer", or other suspicious applications and drag them to the Trash. After removing the potentially unwanted application(s) that cause online ads, scan your Mac for any remaining unwanted components.

Remove mainsourceofupgrade.best pop-up related files and folders:

Finder go to folder command

Click the Finder icon, from the menu bar. Choose Go, and click Go to Folder...

step1Check for adware-generated files in the /Library/LaunchAgents folder:

removing adware from launch agents folder step 1

In the Go to Folder... bar, type: /Library/LaunchAgents

removing adware from launch agents folder step 2
In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step2Check for adware generated files in the /Library/Application Support folder:

removing adware from application support folder step 1

In the Go to Folder... bar, type: /Library/Application Support

removing adware from application support folder step 2
In the “Application Support” folder, look for any recently-added suspicious folders. For example, “MplayerX” or “NicePlayer”, and move these folders to the Trash.

step3Check for adware-generated files in the ~/Library/LaunchAgents folder:

removing adware from ~launch agents folder step 1


In the Go to Folder bar, type: ~/Library/LaunchAgents

removing adware from ~launch agents folder step 2

In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step4Check for adware-generated files in the /Library/LaunchDaemons folder:

removing adware from launch daemons folder step 1
In the Go to Folder... bar, type: /Library/LaunchDaemons

removing adware from launch daemons folder step 2
In the “LaunchDaemons” folder, look for recently-added suspicious files. For example “com.aoudad.net-preferences.plist”, “com.myppes.net-preferences.plist”, "com.kuklorest.net-preferences.plist”, “com.avickUpd.plist”, etc., and move them to the Trash.

step 5 Scan your Mac with Combo Cleaner:

If you have followed all the steps in the correct order you Mac should be clean of infections. To be sure your system is not infected run a scan with Combo Cleaner Antivirus. Download it HERE. After downloading the file double click combocleaner.dmg installer, in the opened window drag and drop Combo Cleaner icon on top of the Applications icon. Now open your launchpad and click on the Combo Cleaner icon. Wait until Combo Cleaner updates it's virus definition database and click "Start Combo Scan" button.

scan-with-combo-cleaner-1

Combo Cleaner will scan your Mac for malware infections. If the antivirus scan displays "no threats found" - this means that you can continue with the removal guide, otherwise it's recommended to remove any found infections before continuing.

scan-with-combo-cleaner-2

After removing files and folders generated by the adware, continue to remove rogue extensions from your Internet browsers.

mainsourceofupgrade.best pop-up removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove mainsourceofupgrade.best pop-up related Safari extensions:

safari browser preferences

Open Safari browser, from the menu bar, select "Safari" and click "Preferences...".

safari extensions window

In the preferences window, select "Extensions" and look for any recently-installed suspicious extensions. When located, click the "Uninstall" button next to it/them. Note that you can safely uninstall all extensions from your Safari browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Safari.

firefox browser iconRemove malicious plug-ins from Mozilla Firefox:

Remove mainsourceofupgrade.best pop-up related Mozilla Firefox add-ons:

accessing mozilla firefox add-ons

Open your Mozilla Firefox browser. At the top right corner of the screen, click the "Open Menu" (three horizontal lines) button. From the opened menu, choose "Add-ons".

removing malicious add-ons from mozilla firefox

Choose the "Extensions" tab and look for any recently-installed suspicious add-ons. When located, click the "Remove" button next to it/them. Note that you can safely uninstall all extensions from your Mozilla Firefox browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Mozilla Firefox.

chrome-browser-iconRemove malicious extensions from Google Chrome:

Remove mainsourceofupgrade.best pop-up related Google Chrome add-ons:

removing malicious google chrome extensions step 1

Open Google Chrome and click the "Chrome menu" (three horizontal lines) button located in the top-right corner of the browser window. From the drop-down menu, choose "More Tools" and select "Extensions".

removing malicious Google Chrome extensions step 2

In the "Extensions" window, look for any recently-installed suspicious add-ons. When located, click the "Trash" button next to it/them. Note that you can safely uninstall all extensions from your Google Chrome browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Google Chrome.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
mainsourceofupgrade.best pop-up QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of mainsourceofupgrade.best pop-up on your mobile device.
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