Avoid downloading fake software updates from mainsiteofupgradenow.best

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

How to remove redirects to mainsiteofupgradenow[.]best from Mac computers

What is mainsiteofupgradenow[.]best?

mainsiteofupgradenow[.]best is a scam website and practically identical to mainsourceofupdate[.]best. It is designed to endorse a fake Adobe Flash Player updater. Visitors to this site are warned that the aforementioned plug-in is outdated and recommends an update. Content promoted on deceptive webpages is often untrustworthy and malicious. Rogue updaters are commonly used to spread Potentially Unwanted Applications (PUAs) such as fake system cleaners and optimizers, browser hijackers, adware, and even malware. Most users enter mainsiteofupgradenow[.]best unintentionally, since they are redirected by intrusive advertisements or PUAs already infiltrated into the device.

mainsiteofupgradenow[.]best scam

When entered, mainsiteofupgradenow[.]best displays a pop-up window with text claiming that visitors' Adobe Flash Player is outdated. It states that, due to the Flash Player lacking the latest security updates, it can no longer be used. This window has two buttons ("Update" and "Download Flash"), which if clicked initiate download of the fraudulent updater. Another pop-up is presented in the bottom-right area of the web page. It urges users to install the latest version of Adobe Flash Player to continue watching content. The background page of mainsiteofupgradenow[.]best states that the updates are necessary to improve Flash Player's performance. The software is an essential browser plug-in, which enables users to play various mediums (e.g. videos, animations, audio, online games, etc.). The deceptive website then reiterates that, as Adobe Flash Player is out-of-date, it has been blocked and recommends that the plug-in be updated so that it can be continued to be used. This web page also has several identical buttons, which lead to the download of the fake updates. The updater will not install the promised updates - instead, it will allow unwanted and/or malicious software onto the system.

Potentially Unwanted Applications (PUAs) can force-open mainsiteofupgradenow[.]best, however, these apps redirect to normal sites as well as deceptive/scam sites. They can open various sale-oriented, untrustworthy, rogue, compromised and malicious sites. 'PUA' is a term that encompasses various unwanted products, which possess different capabilities. Rogue system cleaners/optimizers are also classified as such. These typically require activation to perform their advertised functions (e.g. to remove threats, issues, unnecessary files, etc.), yet after activation (via purchase), they remain nonoperational. Adware is another type of PUA, which operates by delivering intrusive advertisements. The delivered ads diminish the browsing experience, generate redirects to dangerous web pages and stealthily download/install content. PUAs categorized as browser hijackers make unauthorized changes to browsers and limit/deny access to settings. Most unwanted applications (regardless of specific capabilities) can track data. They monitor users' browsing activity (browsing and search engine histories) and collect personal information (IP addresses, geolocations and other details). This sensitive data can then be shared with third parties (often, cyber criminals) intent on misusing it for profit. To summarize, PUAs can cause browser/system infiltration and infections, lead to financial loss, serious privacy issues and even identity theft. Therefore, you are strongly advised to remove all suspicious applications and/or browser extensions immediately upon detection.

Threat Summary:
Name mainsiteofupgradenow.best pop-up
Threat Type Phishing, Scam, Mac malware, Mac virus.
Fake Claim Website claims the visitors' Flash Players are out of date.
Detection Names (fake updater)
Avast (Other:Malware-gen [Trj]), BitDefender (Adware.MAC.Bundlore.DPS), ClamAV (Osx.Trojan.SHLayer-6992220-1), Kaspersky (HEUR:Trojan-Downloader.OSX.Shlayer.a), Full List (VirusTotal)
Promoted Unwanted Application Website promotes fake software updaters.
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.

The internet is rife with deceptive/scam websites and they tend to use various techniques to achieve their goals. Primarily, social engineering and scare tactics are employed to encourage users' into performing specific actions. For example, these pages can claim that a crucial piece of software is outdated, the device has been infected, the visitors have won 'amazing' prizes, and so on. The purpose might be to trick users into downloading/installing or purchasing dubious/malicious content, revealing their personal and banking information, etc. Note that mainsiteofupdatenow[.]best, centersourceoffreeupgrade[.]best, and mainsourceofupdate[.]best are a few examples of scams similar to mainsiteofupgradenow[.]best. You are expressly advised against visiting or trusting such sites.

How did potentially unwanted applications install on my computer?

PUAs can infiltrate devices disguised as different products (e.g. software updaters), however, they can also be downloaded/installed together with normal content. This deceptive marketing method of pre-packing regular programs with unwanted or malicious software is called "bundling". Rushing download/installation processes (e.g. ignoring terms, skipping steps, etc.) increases the risk of potential system infiltration and infections. Some PUAs have "official" promotional web pages, where then are often endorsed as "useful" and "free". When clicked, intrusive advertisements can execute scripts to download/install PUAs without users' consent.

How to avoid installation of potentially unwanted applications

It is important to research all content, prior to downloading/installing. Use only official and verified download sources. The same applies to software activation and update - this should only be done with tools/functions provided by legitimate developers. Untrustworthy download channels such as P2P sharing networks (BitTorrent, Gnutella, eMule, etc.), free file-hosting websites and other third party downloaders are more likely to offer deceptive and/or bundled products, and should not be used. When downloading/installing, read the terms, explore all possible options, use the "Custom/Advanced" settings and opt-out of additional apps, tools, features and so on. Intrusive ads usually seem normal and innocuous, however, they can redirect to highly dubious sites (e.g. gambling, pornography, adult-dating, etc.). If you encounter these advertisements/redirects, inspect the device and immediately remove all dubious applications and/or browser extensions/plug-ins. 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 mainsiteofupgradenow[.]best center pop-up window:

Software update

"Adobe Flash Player" is out-of-date

The version of this plug-in on your computer doesn't include the latest security updates. Flash cannot be used until yu download an update from Adobe.

Update Download Flash...

Screenshot of mainsiteofupgradenow[.]best background page:

mainsiteofupgradenow[.]best scam background page

Text presented in the background page:

Software update

Update your Adobe Flash Player

Install the latest Flash Player for better performances.

Update Now

"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.

The version of this plug-in on your computer doesn't include the latest security updates. Flash cannot be used until you download an update from Adobe.

Click "Download Flash"

Install updates and enjoy performances

Text presented in the bottom-right pop-up:

Flash Player Update REQUIRED

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

Download

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

Appearance of mainsiteofupgradenow[.]best scam (GIF)

Screenshot of the fake Flash Player updater:

mainsiteofupgradenow[.]best scam fake updater 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 adware and browser hijackers from a Mac computer:

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 mainsiteofupgradenow.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.

mainsiteofupgradenow.best pop-up removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove mainsiteofupgradenow.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 mainsiteofupgradenow.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 mainsiteofupgradenow.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
mainsiteofupgradenow.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 mainsiteofupgradenow.best pop-up on your mobile device.
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