Avoid downloading dubious applications from Chksumm deceptive sites

Also Known As: Chksumm pop-up
Type: Mac Virus
Distribution: Moderate
Damage level: Medium

How to remove "Chksumm" from Mac?

What is "Chksumm"?

Chksumm is the name of a scam website family. These pages are designed to promote dubious applications, which are typically fake and nonfunctional. This variant promotes the Smart Mac Booster PUA (Potentially Unwanted Application). Said deceptive webpages show alerts of various threats/issues found on visitors' devices and offer software for their elimination. Users should note that no website can detect problems present within operating system; therefore, such claims cannot be trusted. Most visits to Chksumm occur inadvertently, via redirects caused by intrusive advertisements or by PUAs.

Chksumm scam

Once accessed, Chksumm displays a pop-up window. The message therein claims that a website that users visited today has infected their MacOS (Mac Operating System) with a virus. Pressing "OK" will allegedly begin the repair process. When visitors close the pop-up, the site shows them a different page. It repeats the warning from the previous window and adds that a full system scan is required to locate and remove the harmful files/applications. Furthermore, the page lists users' device details, such as brand, OS version, browser, IP address, Internet provider and location. The "Scan Now" button starts a fake scan, which "detects" a high-risk virus called "Bankworm". For the elimination of the threat, Chksumm recommends Advanced Mac Cleaner. Attempting to obtain this applications leads users to the promotional webpage of Smart Mac Booster. Following the instructions in order to download the aforementioned app, results in the download of the maccleaner.pkg file. This file is a known proliferation tool for PUAs. It spreads unwanted applications other than Smart Mac Booster. Such as Advanced Mac TuneupMac Cleanup ProMacKeeper and dozens of others. Software of this type usually requires to be purchased to become operational, however even after payment it tends to remain nonoperational.

In general, PUAs share many similarities in between. They look legitimate and offer a broad array of "useful" features, which are often utterly nonfunctional. As mentioned, these apps generate redirects to untrustworthy, deceptive/scam and malicious sites. They can also deliver intrusive advertisements, by employing tools to enable third party graphical content. These ads not only diminish browsing quality (i.e. overlay pages, hence limiting visibility and browsing speed), but also redirect to dangerous websites and stealthily download/install PUAs. Unwanted applications can hijack browsers as well. Data tracking abilities are a major concern with PUAs. Those with such can record browsing activity (browsing and search engine histories) and gather users' personal information (IP addresses, geolocations and real-life personal details). This collected data is then shared with third parties (potentially, cyber criminals), seeking to misuse it for financial gain. In summary, PUAs can cause various browser/system infiltrations and infections, as well as lead to financial losses, severe privacy issues and even identity theft. To ensure device and user safety - all suspect applications and browser extensions/plug-ins must be removed without delay.

Threat Summary:
Name Chksumm pop-up
Threat Type Phishing, Scam, Mac malware, Mac virus
Fake Claim Chksumm websites claim that visitor's device is infected with a virus and encourage them to download a cleaning software.
Detection Names Kaspersky (Malware), Full List (VirusTotal)
Serving IP Address 193.35.51.7
Related Domains Full list below.
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.
Removal

To eliminate Chksumm pop-up our malware researchers recommend scanning your computer with Combo Cleaner.
▼ Download Combo Cleaner
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.

The Internet is rife with scam websites, which tend to share certain similarities and some are even identical. For example, TrksmmNothsws, Zxcvc are identical to Chksumm. These webpages use scare-tactics, mainly for the purpose of endorsing illegitimate and nonoperational software. They operate by scaring visitors with alarms of detected "threats" and push them into installing and/or purchasing untrustworthy apps. Few users enter deceptive pages intentionally, most get redirected by PUAs or by intrusive adverts.

How did potentially unwanted applications install on my computer?

PUAs can be downloaded/installed together with other software. This false marketing method of pre-packing regular content with these applications is called "bundling". By rushing through download/installation processes (e.g. by skipping steps, using pre-set options, etc.) - users endanger their devices with potential system infiltrations and infections. Some PUAs have "official" download sites, where they are often endorsed as "free" and "handy". When clicked, intrusive advertisements can execute scripts, designed to download/install unwanted content, without user permission.

How to avoid installation of potentially unwanted applications?

It is highly recommended to always research wanted products, before downloading/installing them. Only official and verified download channels should be used. Using Peer-to-Peer sharing networks (BitTorrent, Gnutella, eMule, etc.), free file-hosting websites and other third party downloaders - is ill-advised, as they are considered to be untrustworthy. Download and installation processes should be treated with caution. Therefore, users should read terms, explore all possible options, use the "Custom/Advanced" settings and opt-out from downloading/installing additional apps, tools, functions, etc. Intrusive adverts usually appear ordinary and harmless, however they redirect to questionable webpages (e.g. gambling, adult-dating, pornography and others). Should users encounter ads/redirects of this kind, they are strongly advised to inspect the device and immediately remove all suspicious 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 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 the second page displayed by Chksumm:

chksumm second page

Text presented on this 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 the fake system scan results:

chksumm fake scan

Text presented in this 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 "Chksumm" scam (GIF):

Appearance of Chksumm scam (GIF)

List of domains relating to Chksumm website family:

chksumm55[.]live chksumm62[.]live
chksumm56[.]live chksumm73[.]live

Screenshot of the Smart Mac Booster installation set-up:

chksumm installer

Screenshot of the Smart Mac Booster application:

chksumm app

Instant automatic removal of Chksumm pop-up: 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 Chksumm pop-up. 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. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.

Quick menu:

Video showing how to remove unwanted applications promoted via Chksumm websites 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 chksumm 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.

Chksumm pop-up removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove chksumm 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 chksumm 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 chksumm 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 virus and spyware activity level today:

Medium threat activity
Medium

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

QR Code
Chksumm 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 Chksumm pop-up on your mobile device.
We Recommend:

Get rid of Chksumm pop-up today:

▼ REMOVE IT NOW with Combo Cleaner for Mac

Platform: macOS

Editors' Rating for Combo Cleaner:
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Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.