MusiCalm ads: what it is and how to remove it
MusiCalm is a potentially unwanted program that users typically download in a bundle from third-party sites. As a result, they do not notice the entry point, so many even aren't aware that they have the program installed in the first place.
Facts checked October 6, 2026. Removal steps tested on Windows 11 (26H2) and checked against Microsoft's and the browser makers' current documentation. Sections marked as our earlier report are the original text: they describe the threat as it was then and have not been reviewed since. The 2026 status, the removal steps and the questions are current.
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MusiCalm ads: summary
| Damage | Installation of other potentially unwanted programs or malware, loss of personal information, financial losses, identity theft |
|---|---|
| Name | MusiCalm |
| Type | Adware, potentially unwanted program |
| Alleged functionality | Music player |
| Infiltration | Pirated software installers, software cracks, freeware bundles, fake updates, and other shady methods |
| Symptoms | Intrusive advertisements show up on all websites that you visit, web browser settings altered, unknown browser extensions or apps installed without permissions, redirects bring to insecure sites, etc. |
| Removal | Scan the PC with security software to find and remove the malware and anything installed with it. Fortect scans Windows for malware and repairs the system files and settings it damaged. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 11 more facts
| Executable names | SmoothVideo Project (SVP) Pro 4.3.0.182 Crack Registration Key [Latest].exe, MusiCalm.exe, Setup_Video_Codecs.exe |
|---|---|
| System fix | Malware can sometimes damage system files, making the computer crash, lag, or suffer from other stability issues |
| Detection names | No Microsoft detection name is known |
| Distribution | Not recorded in the old report |
| Evidence | 4 write-ups by security sites; details still limited |
| Domains | lesvirus.fr |
| Ads shown as | Redirects through ad pages |
| Browsers | Chrome, Edge and Firefox |
| First seen | 22 April 2020 |
| Microsoft Defender name | Trojan:MSIL/Skeeyah!MTB |
| Facts checked | 6 October 2026 |
Is MusiCalm ads dangerous?
From our report of Apr 2020 · not reviewed since
MusiCalm - a music player that will flood your browsers with ads
MusiCalm is a potentially unwanted program that users typically download in a bundle from third-party sites.
As a result, they do not notice the entry point, so many even aren't aware that they have the program installed in the first place. What is depicted as a useful media player is actually an intrusive adware application that will display pop-ups, deals, offers, coupons, and another type of advertisement on Google Chrome, Mozilla Firefox, MS Edge, Safari, or another web browser.
Additionally, users might hind that their web browser settings, such as the new tab URL, homepage, and the search engine, were altered by the MusiCalm virus.
Besides the intrusive commercial content, adware is also often used to track users' web browsing activities and, in some cases, even record personal information like email for marketing purposes. If you want to get rid of MusiCalm ads, you have to uninstall the app from your system.
While most users download MusiCalm adware from legitimate third-party software distribution sites, some versions of the virus were also observed being spread via illegal cracking tool installers, such as SmoothVideo Project (SVP) Pro 4.3.0.182 Crack Registration Key .exe.
Downloading software cracks is a huge security risk, and you should not engage in such activities in order to avoid the MusiCalm virus, as well as much more devastating computer infections such as ransomware or remote access trojan (RAT).
Also, there are several reputable anti-malware programs that could prevent the infiltration of MusiCalm and other infections. One of the application samples is recognized as follows on Virus Total:
Judging by the definitions of anti-malware detection, some versions of the MusiCalm virus can be classified as Trojans. Such infections are particularly dangerous, as they operate silently in the background, and are typically performing data-harvesting operations. As a result, users might get their sensitive information compromised, such as credit card details or social security numbers.
If you have been infected with a similar malware, you should hurry MusiCalm removal, as otherwise, you might suffer from financial losses or even identity theft. For that, you should use reputable anti-malware software such as or - download the latest version and initiate a full system scan. This will remove MusiCalm and all its components from your machine in just a few minutes.
Unfortunately, those who download MusiCalm and are unaware of its presence might only notice the symptoms of infection when bowing the web. As previously mentioned, several browser settings might be altered without permission, and users might see changes within search results already - they might be littered with ads and sponsored links.
While most of these links are relatively safe, some MusiCalm ads and redirects can bring users to far more nefarious places on the internet. Those infected with adware are prone to be redirected to tech support scams, spoofing, fake update, or similar malicious websites.
It is important not to download and install anything at this point, as the computer might suffer from further infections. Additionally, the infected users might also notice ads marked as "Ads by MusiCalm," "Powered by MusiCalm," or similar.
Thus, MusiCalm virus infection will not only serve intrusive ads during your web browsing sessions, alter search results, and otherwise disturb online activities, but might also compromise your security.
Note: there is another application for iOS devices that is also called MusiCalm. However, please take note that it is not the same as MusiCalm adware, and the former is legitimate and safe, developed by Improve Yazılım Hizmetleri Sanayi ve Ticaret Limited Şirketi (can be downloaded from the official Apple's App Store).
- Win32:AdwareSig
- Gen:Variant.MSILPerseus.213713
- Generic PUA NO (PUA)
- Trojan:MSIL/Skeeyah!MTB
- Trojan.Gen.MBT
- Artemis!PUP
- Trojan.Win32.Generic.pak!cobra
From our report of Apr 2020 · not reviewed since
Be careful when you download and install new apps to avoid unwanted software
While adware is generally considered more of a nuisance than a security threat, some potentially unwanted programs are borderline malware and should be looked at seriously.
Since most of the PUPs are delivered via deceptive methods, users might not even be aware that their computers and personal safety are exposed to risks. On the other hand, many adware apps that require installation can be eliminated easily manually; in other cases, browser extensions can also make browsers show ads and expose them to unneeded risks, although they can be eliminated very easily.
Since there are thousands of apps created regularly, it is difficult to track which ones are secure and which are not - especially from regular users. The best way to get around this is to ensure that PUPs are not installed on the computer in the first place - and it is relatively easy to do. Here's what experts from lesvirus.fr advise:
- If possible, always download applications from official sources, such as Google Web Store, Microsoft Store, etc.;
- If you choose to download programs from third-parties, always opt for Advanced/Custom settings when prompted;
- Read the fine print, as it can provide important information about the installation;
- Watch out for misleading deals/offers and misplaced buttons during the installation process;
- Remove all ticks next to add-ons, media players, PDF converters, system optimizers, and other offered software;
- Employ anti-malware software that can detect PUPs.
From our report of Apr 2020 · not reviewed since
More from our earlier report on MusiCalm
- If you found the app on your system unexpectedly or you downloaded a software crack, you should immediately scan the machine with anti-malware software.
Check your browser and PC
Which name will your scanner show?
Microsoft's name for MusiCalm is Trojan:MSIL/Skeeyah!MTB.
Defender sorts threats by category first, so the word before the colon tells you what kind of program was found, even if the family name means nothing to you.
Do not search for a removal tool by the detection name alone; fake "removal tools" use the same keywords. How the naming works is explained in our guide to antivirus detection names.
- Address:
lesvirus.fr
How to remove MusiCalm ads
How to remove the MusiCalm extension
Do the browser steps in every browser and profile on the PC, then check Windows for the program that installed the extension.
Step 1: Remove extensions you did not add
In Chrome open
chrome://extensions, in Edgeedge://extensions, and in Firefox the menu > Extensions and themes.Remove every extension you do not remember adding, especially search, new tab, coupon, PDF, weather or video downloader add-ons. Check every browser and every profile, because each keeps its own list.
If an extension has no Remove button or comes back, a browser policy holds it (see "Managed by your organization" in the procedure below). The pages are the same on Windows 11 and Windows 10.
Chrome on Windows 11: More > Extensions > Manage extensions. Full procedure with screenshots: Remove a browser extension
Step 2: Uninstall programs you did not mean to install
MusiCalm rarely comes alone: it is usually installed by, or together with, a free program. In Windows 11 open Settings > Apps > Installed apps, in Windows 10 Settings > Apps > Apps & features, and sort by install date.
Uninstall every entry from the day the trouble began that you did not install on purpose, for example a download manager, a converter or a browser you never chose.
Keep drivers and entries from Microsoft, Intel, AMD, NVIDIA or your PC's maker unless you are sure.
Full procedure with screenshots: Uninstall a program or app in Windows On uGetFix
Step 3: Reset the browser
A reset removes what the steps above could miss:
- changed start pages
- site permissions
- hidden settings
In Chrome open Settings > Reset settings > Restore settings to their original defaults; in Edge Settings > Reset settings; in Firefox Help > More troubleshooting information > Refresh Firefox.
Tip: Bookmarks and saved passwords stay, while extensions are turned off and the search engine and start page return to the defaults.
Reset every browser on the PC, including Edge, which Windows 11 and Windows 10 always have.
Chrome on Windows 11: Settings > Reset settings. Full procedure with screenshots: Reset a browser and fix a hijacked search engine
Step 4: Scan the PC, then run the offline scan
A scan finds the parts of MusiCalm that the manual steps cannot see. In Windows Security > Virus & threat protection > Scan options, start a Full scan and quarantine what it reports.
Follow it with Microsoft Defender Antivirus (offline scan) > Scan now, which restarts the PC and checks the disk while Windows and the malware are not running.
It takes about 15 minutes and works the same in Windows 11 and Windows 10. If either scan finds something, run the full scan again after removal until it comes back clean.
Windows 11: Windows Security > Virus & threat protection > Scan options. Full procedure with screenshots: Run a Microsoft Defender Offline scan
Instructions for each browser and system
The detailed steps for every browser and system this guide covers. Open the one you use.
Uninstall from Windows
Top get rid of MusiCalm via Control Panel, follow these steps:
Uninstall from Windows 10/8:
- Type Control Panel into the Windows search box and open the result.
- Under Programs, select Uninstall a program.
Uninstall from Windows 7/XP:
- Click on Windows Start > Control Panel (Windows XP users should click on Add/Remove Programs).
- In Control Panel, select Programs > Uninstall a program.
Remove the unwanted program:
- In the Programs and Features window, look for any recently installed suspicious entries, select them, and click Uninstall.
- If User Account Control appears, click Yes to confirm, then complete the removal.
Remove from Google Chrome
Reset Google Chrome to eliminate settings that were set by the PUP:
Delete malicious extensions from Google Chrome:
- Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
- In the newly opened window, you will see all the installed extensions. Uninstall all suspicious extensions related to the unwanted program by clicking Remove.
Clear cache and web data from Chrome:
- Click on Menu and pick Settings.
- Under Privacy and security, select Clear browsing data.
- Select Browsing history, Cookies and other site data, as well as Cached images and files.
- Click Clear data.
Change your homepage:
- Click menu and choose Settings.
- Look for a suspicious site in the On startup section.
- Click on Open a specific or set of pages and click on three dots to find the Remove option.
Reset Google Chrome:
If the previous methods did not help you, reset Google Chrome to eliminate all the unwanted components:
- Click on Menu and select Settings.
- In the Settings, scroll down and click Advanced.
- Scroll down and locate Reset and clean up section.
- Now click Restore settings to their original defaults.
- Confirm with Reset settings.
Remove from Microsoft Edge
Delete unwanted extensions from MS Edge:
- Select Menu (three horizontal dots at the top-right of the browser window) and pick Extensions.
- From the list, pick the extension and click on the Gear icon.
- Click Remove.
Clear cookies and other browser data:
- Click on the Menu (three horizontal dots at the top-right of the browser window) and select Settings > Privacy, search, and services..
- Under Clear browsing data, pick Choose what to clear.
- Select Cookies and other site data and Cached images and files. (apart from passwords, although you might want to include Media licenses as well, if applicable) and click on Clear.
Restore new tab and homepage settings:
- Click the menu icon and choose Settings.
- Then find On startup section.
- Click Remove next to any suspicious startup page.
Reset MS Edge if the above steps did not work:
- Press on Ctrl + Shift + Esc to open Task Manager.
- Click on More details arrow at the bottom of the window.
- Select Details tab.
- Now scroll down and locate every entry with Microsoft Edge name in it. Right-click on each of them and select End Task to stop MS Edge from running.
Delete extensions from MS Edge (Chromium):
- Open Edge and click select Settings > Extensions.
- Delete unwanted extensions by clicking Remove.
Clear cache and site data:
- Click on Menu and go to Settings.
- Select Privacy, search and services.
- Under Clear browsing data, pick Choose what to clear.
- Under Time range, pick All time.
- Select Clear now.
Reset Chromium-based MS Edge:
- Click on Menu and select Settings.
- On the left side, pick Reset settings.
- Select Restore settings to their default values.
- Confirm with Reset.
- This will disable extensions and reset startup pages but will not delete bookmarks, saved passwords, or browsing history.
Remove from Mozilla Firefox (FF)
Remove dangerous extensions:
- Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
- Select Add-ons.
- In here, select the unwanted extension and click Remove.
Reset the homepage:
- Click three horizontal lines at the top right corner to open the menu.
- Choose Settings.
- Under Home, set your preferred homepage and new tab settings.
Clear cookies and site data:
- Click Menu and pick Settings.
- Go to Privacy & Security section.
- Scroll down to locate Cookies and Site Data.
- Click on Clear Data...
- Select Cookies and Site Data and Temporary cached files and pages, then click Clear.
Reset Mozilla Firefox
If clearing the browser as explained above did not help, reset Mozilla Firefox:
- Open Mozilla Firefox browser and click the Menu.
- Go to Help and then choose Troubleshooting Information.
- Under Give Firefox a tune up section, click on Refresh Firefox...
- Once the pop-up shows up, confirm the action by pressing on Refresh Firefox.
Delete from Safari
Remove dangerous extensions:
- Open Safari, click Safari in the menu at the top-left of the screen, and select Preferences.
- Go to the Extensions tab, look for any suspicious entries, and click Uninstall to remove them.
Clear history and website data:
- Click Safari in the menu and pick Clear History.
- Set Clear to all history and confirm with Clear History.
Reset Safari:
- Click Safari in the menu and select Preferences > Advanced.
- Enable Show Develop menu in menu bar.
- From the menu bar, click Develop and select Empty Caches.
Delete from macOS
Remove the unwanted application:
- From the menu bar, select Go > Applications.
- In the Applications folder, look for any suspicious entries, then drag them to Trash (or right-click and pick Move to Trash).
Delete leftover files and folders:
- Select Go > Go to Folder.
- Enter /Library/Application Support and remove any suspicious folders related to the unwanted program.
- Repeat the same check in the /Library/LaunchAgents and /Library/LaunchDaemons folders, deleting any suspicious entries.
- Finally, empty the Trash to permanently remove the leftovers.
Reset Internet Explorer
Remove dangerous add-ons:
- Open Internet Explorer, click on the Gear icon (IE menu) on the top-right corner of the browser
- Pick Manage Add-ons.
- You will see a Manage Add-ons window. Here, look for suspicious plugins. Click on these entries and select Disable.
Change your homepage if it was altered:
- Open IE and click on the Gear icon.
- Select Internet Options.
- In the General tab, delete the Home page address and replace it by your preferred one (for example, Google.com).
- Click Apply and then select OK.
Delete temporary files:
- Press on the Gear icon and select Internet Options.
- Under Browsing history, click Delete...
- Select relevant fields and press Delete.
Reset Internet Explorer:
- Click on Gear icon > Internet options and select Advanced tab.
- Select Reset.
- In the new window, check Delete personal settings and select Reset.
Choose a proper web browser and improve your safety with a VPN tool
Online spying has got momentum in recent years and people are getting more and more interested in how to protect their privacy online.
One of the basic means to add a layer of security - choose the most private and secure web browser. Although web browsers can't grant full privacy protection and security, some of them are much better at sandboxing, HTTPS upgrading, active content blocking, tracking blocking, phishing protection, and similar privacy-oriented features.
However, if you want true anonymity, we suggest you employ a powerful VPN - it can encrypt all the traffic that comes and goes out of your computer, preventing tracking completely.
Lost your files? Use data recovery software
While some files located on any computer are replaceable or useless, others can be extremely valuable.
Family photos, work documents, school projects - these are types of files that we don't want to lose. Unfortunately, there are many ways how unexpected data loss can occur:
- power cuts
- Blue Screen of Death errors
- hardware failures
- crypto-malware attack
- even accidental deletion
To ensure that all the files remain intact, you should prepare regular data backups. You can choose cloud-based or physical copies you could restore from later in case of a disaster. If your backups were lost as well or you never bothered to prepare any, can be your only hope to retrieve your invaluable files.
From our report of Apr 2020 · not reviewed since
Eliminate MusiCalm from your system
MusiCalm removal highly depends on your system configuration, installed apps, and many other features.
Since rogue apps are often delivered in bundles, it is highly likely that, in case your device was infected with one of such unwanted programs, there are more. If you simply notice an increased amount of advertisements and web browser changes, you can try to remove MusiCalm manually by following the detailed guide below and resetting all the installed browsers.
Nonetheless, the MusiCalm virus might not be the only infection on your system, so the best way to handle this is to perform a full system scan with reputable anti-malware software that can recognize potentially unwanted programs.
Besides, if you downloaded software cracks or similar illegal tools, your system might be infected with trojans, data-stealers, crypto-miners, and other malicious software. Security programs can check your system thoroughly and eliminate all the found malicious components. Besides, anti-malware can also keep you safe from future adware/malware infections as long as you keep it up to date.
Questions about MusiCalm ads
lesvirus.fr opens when I click links. What causes it?
When every click leads to lesvirus.fr first, an extension or a script on the page is rewriting the links. If it happens only on one site, that site uses aggressive ads; close it and use another source. If it happens everywhere, open the browser in a private window, where extensions are normally off, and try again.
No redirect in the private window means one of your extensions is responsible: remove the ones you do not know. A redirect in the private window too means the cause is outside the extensions, such as a notification permission, a changed search setting or a program installed on the PC. The removal steps in this guide cover each of those.
Is it safe that my browser was redirected to lesvirus.fr?
Landing on lesvirus.fr does not infect the PC by itself. A browser does not run programs from a page without your action. The danger is in the pages that come next:
- some ask you to allow notifications
- some show fake virus warnings
- some offer downloads
- ask for card details
If you only saw those pages and closed them, nothing more is needed than removing whatever caused the redirect. If you allowed notifications, remove that permission.
If you downloaded a file, delete it unopened, or uninstall it if you ran it. If you typed a password or card number on one of the pages, change the password and call your bank.
Why does MusiCalm show me ads?
Because that is its whole purpose. MusiCalm is an adware extension, and its operators are paid for every ad it displays and every click it gets. In this case the ads take the form of redirects through ad pages.
They are chosen by ad networks that accept almost any advertiser, which is why so many look like warnings or prizes. The ads are not a sign that your PC is broken or infected with something worse; they are a sign that something on it, or in the browser, has permission to advertise. Removing that permission or program stops them.
Is MusiCalm a virus?
Not in the strict sense. A virus copies itself into other files; MusiCalm does not. Security companies classify it as adware or a potentially unwanted program, and Microsoft Defender reports it as Trojan:MSIL/Skeeyah!MTB.
The label "not a virus" does not mean safe, though. MusiCalm changes what you see in the browser, collects browsing data and sends you to pages that sometimes carry real malware or scams. Treat it as something to remove rather than something to live with, and follow the plan above for each browser you use.
Do I have to clean every browser?
Yes, if you use more than one. We saw MusiCalm in Chrome, Edge and Firefox, and each browser keeps its own extensions, notification permissions and settings. Chrome and Edge share the same extension format, so one installer can add the same adware to both, while Firefox has its own add-ons.
Check every browser on the PC, including ones you rarely open. If you sync a browser with an account, clean it while signed in, so that the removal reaches your other computers rather than the adware returning from them.
How do I know the ads come from MusiCalm?
Look for redirects to lesvirus.fr. That is the trace MusiCalm leaves, and it shows up as redirects through ad pages. Ads that appear on every site, including ones that never carried ads before, point to something on your PC or in the browser rather than to the sites themselves.
A quick test is a private window, where extensions are off by default: if the ads disappear there, an extension is responsible. If they appear even with the browser closed, the source is a notification permission or a program in Windows.
An ad showed a phone number and I called it. What now?
The number belongs to scammers, not to Microsoft or an antivirus company. If you only talked, hang up and do not call back. If you let them connect to the PC, disconnect it from the internet, uninstall the remote access program they used, such as AnyDesk, TeamViewer, ScreenConnect or UltraViewer, and run a full and offline scan.
If you paid or gave bank details, call your bank at once on the number printed on your card. Change any passwords you typed while they were connected, and report the call.
I clicked on one of the ads. Am I infected?
Probably not. Clicking an ad usually only opens a page, and a page cannot install programs on an up-to-date Windows PC without your help.
You are at risk only if you then downloaded and ran a file, allowed notifications, entered card or login details, or called a phone number shown on the page. Delete any download and run a full and offline scan.
Change passwords you typed, from a clean device. Call your bank if you gave card details. If you called a number or allowed remote access, see the next question.
Does adware steal passwords?
Ordinary adware is built to show ads, not to steal logins, and most of it never touches saved passwords. The line is blurry, though. Extensions that can read every page could capture what you type, and adware ads sometimes lead to phishing pages that ask for passwords directly.
If you entered credentials on a page reached through an ad, change that password from a clean device and turn on two-step verification. Otherwise, removing adware extension and clearing cookies is usually enough.
Will Fortect remove MusiCalm?
Fortect scans Windows for malware and unwanted programs and repairs the system files and settings they change, and its free scan shows what it finds on your PC before you decide anything.
For MusiCalm, follow the plan above as well: the browser steps take back permissions and settings that no scanner treats as a threat, and uninstalling the program that brought it removes the source.
Run Microsoft Defender's full scan and, if anything was found, its offline scan as a second opinion. If the symptoms are gone after the plan and both scans are clean, there is nothing more to do.
Sources
- How-To Geek: What is RATMalware, and Why Is It So Dangerous? (read October 6, 2026)
- Virus Total: 73edf63760603270ab67613d7f369139c592be857128c9f2779aa79a029209fd (read October 6, 2026)
- Lesvirus: Lesvirus (read October 6, 2026)
- Google Chrome Help: Use notifications to get alerts (no longer online) (read October 6, 2026)
- FTC: How to recognize, remove and avoid malware (read October 6, 2026)