Avoid downloading dubious software through Mondaysunday

Also Known As: Mondaysunday pop-up
Type: Mac Virus
Distribution: Low
Damage level: Medium

How to avoid redirects to Mondaysunday

What is Mondaysunday?

Mondaysunday is a deceptive website used to advertise a rogue application called Smart Mac Booster. When opened, it informs visitors that their computers are infected with viruses and encourages them to remove the threats with the aforementioned application. Websites such as Mondaysunday and apps promoted on them should not be trusted. Typically, websites of this type are opened by potentially unwanted applications (PUAs) that are installed on browsers or computers. PUAs are often designed to record various user-system information and display annoying, often deceptive advertisements.

Mondaysunday scam

At first, Mondaysunday displays a pop-up window stating that the visitor's Mac computer is infected with a virus. The Mondaysunday website mentions that this virus infected the computer through a previously visited website. To remove harmful files or applications, visitors can supposedly scan their computers by clicking the "Scan Now" button. This website launches a fake virus scanner, which detects a virus named "Bankworm" and indicates that the name of an infected file is "/os/apps/worm.icv". Visitors can apparently remove this virus by clicking the "REMOVE VIRUS NOW" button, which downloads the maccleaner.pkg file (installer of the Smart Mac Booster application). As we mentioned, Mondaysunday is a deceptive website that cannot be trusted. Therefore, applications that are advertised through it should also not be trusted. It is very likely that this website might be designed to promote different applications at different times.

If your browser opens web pages such as Mondaysunday automatically, it is very likely that there is a PUA installed on it. Apps of this type gather information relating users, which the developers share with third parties (potentially cyber criminals) who misuse private data to generate revenue. Typically, PUAs record users' IP addresses, geolocations, addresses of visited websites, entered search queries, etc., however, they might also target sensitive information. Furthermore, many apps of this type feed users with unwanted advertisements including, for example, banners, coupons, pop-ups, surveys, etc. If clicked, these often redirect people to untrustworthy, potentially malicious web pages or download (or even install) unwanted software.

Threat Summary:
Name Mondaysunday pop-up
Threat Type Mac malware, Mac virus.
Fake Claim Mondaysunday claims that the visitor's Mac is infected with the Bankworm virus.
Detection Names BitDefender (Malware), G-Data (Phishing), Sophos AV (Malicious), Spamhaus (Spam), Full List (VirusTotal).
Serving IP Address 185.89.102.8
Promoted Unwanted Application Smart Mac Booster
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.

There are many other websites similar to Mondaysunday. Some examples are Websitetrafficgo, apple.com-shield-guard[.]live, and Tutonhamon. Typically, they notify visitors that their computers are infected with a virus (or viruses) and encourage to them to remove detected malware with another app immediately. PUAs are generally very similar: most gather data and serve intrusive advertisements. If any PUAs or other unwanted apps are installed on your Mac, they should be removed immediately.

How did potentially unwanted applications install on my computer?

People download generally and install unwanted software (such as PUAs) unintentionally. Typically, this happens when PUAs are included in the set-ups of other programs. In most cases, information about these additionally-included apps is hidden in options such as "Advanced", "Custom", and so on. Unfortunately, many people fail to check and change these settings, and do not dismiss offers to download and/or install additional software. When they leave the settings unchanged, they often allow PUAs to be downloaded or installed with regular software. PUAs can sometimes be downloaded/installed by clicking intrusive, deceptive advertisements. Some ads run scripts that download and/or install unwanted programs.

How to avoid installation of potentially unwanted applications

Download software using official, trustworthy websites and direct download links. Other sources/tools such as third party downloaders, installers, Peer-to-Peer networks (torrent clients, eMule), unofficial websites should not be trusted. They are often used to distribute various PUAs. Check settings such as "Custom" and "Advanced" that are included in download/installation set-ups. Dismiss any offers to download or install additional (unwanted) software before finishing the download/installation. Do not click intrusive advertisements, since they often cause redirects to potentially malicious websites or download/install unwanted applications. Finally, if there are any unwanted extensions, plug-ins, and add-ons installed on the browser or unwanted programs on the computer, we strongly recommend that you remove/uninstall them immediately. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

Text in the pop-up window:

VIRUS FOUND

A website you visited today has infected your Mac with a virus.

Press OK to begin the repair process.

Screenshot of a second Mondaysunday web page:

mondaysunday encourages visitors to scan their computers

Text in this web page:

VIRUS FOUND
A website you have visited today has infected your Mac with a virus. A full system scan is now required to find and remove harmful files or applications from your Mac OS X 10_13_6 device.
DEVICE INFORMATION
Brand: Apple
Device: Mac OS X 10_13_6
Browser: Safari 12.0.1
IP: 85.206.10.62
Provider: Telia Lietuva, AB
Location: - LT
Scan Now

Screenshot of scanning results:

mondaysunday displays fake results

Text in this web page:

DOWNLOAD REQUIRED
Please download the Advanced Mac Cleaner application to remove Bankworm from your Mac.
VIRUS INFORMATION
Virus Name: Bankworm
Risk: HIGH
Infected File: /os/apps/worm.icv
VIRUS REMOVAL
Application: Advanced Mac Cleaner
Rating: 9.9/10
Price: Free
REMOVE VIRUS NOW

Appearance of Mondaysunday scam (GIF):

Appearance of Mondaysunday scam (GIF)

Installer of Smart Mac Booster:

smart mac booster installer

Smart Mac Booster application:

smart mac booster application

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 Mondaysunday pop-up scam 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 mondaysunday 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.

Mondaysunday pop-up removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove mondaysunday 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 mondaysunday 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 mondaysunday 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.

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.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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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
Mondaysunday 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 Mondaysunday pop-up on your mobile device.
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