How to Remove Nimbostratus

In order to be able to hijack a browser, there has to be a program to introduce it, and most of the time, it has been completed by installing unwanted browser extensions. Apart from hijacking, the app that is causing this has also been designated to do other wicked stuff, including tracking data and redirecting pages to other malicious sites. An example of this undesirable browser extension is called Nimbostratus.

Further information on Nimbostratus

Looking at NeophocaCinerea, Suidae, and PythonRegius, we can clearly see that Nimbostratus looks like the mentioned browser hijacker variants. They belong virtually to the same block of adware families, and in reality, there were already a hundred duplicates of this doubtful application. Only the title or name given to the extension is changeable, and everything else remains as-is. Nimbostratus propagates in the same manner as its predecessors, and as usual, it uses the following tactics:

Malicious software bundles

Freeware downloads, shareware, and unreliable third-party programs are strongly opposed by IT security experts, specifically those that come from suspicious sites. In their opinion, they are common sources of adware or malware infections. To support this, they assert that most of the suspicious freeware sites embed the adware into their programs. Hence, downloading and installing them opens the path for the unwanted program to enter the computer.

Aggressive advertisements

Pop-ups that are overly convincing are another method by which we plotted the massive distribution of Nimbostratus. The pop-up promotes Nimbostratus as a valuable app that enhances the online search and navigation experience for online users. Additionally, this tool claims to provide quick links to web sites and online file conversion resources. However, what happened after the installation of Nimbostratus was, in fact, the opposite. The browser will suffer from decreased performance and the annoying display of a large number of commercials. Internet programs will suffer from decreased performance and the annoying display of a large number of commercials.

Bogus software update

As with obtrusive ads, the regimen for this technique also uses the online advertising campaign to dispense Nimbostratus. However, this approach is evasive and requires an immeasurable amount of deceitful visuals, including page design, content, graphics, and attractive links. The page intends to defraud the web user by proclaiming that the system alert, which has recognized software conflicts and software upgrade downloads, must be conducted as soon as possible. However, rather than the update, the ads will install Nimbostratus into the Internet browser application.

Screenshot of Nimbostratus

What can be done with Nimbostratus?

Knowing that this browser extension provides no benefit and all it can bear are inconveniences and disorder to the web user’s browsing experience, there is no other option but to obliterate it from the computer. In the succeeding section, we provide easy steps with a virus and malware scanner to carefully check for malevolent entry on the computer.

Procedures to Remove Nimbostratus from Mac

This section contains comprehensive guide for Mac users. It will help you remove malicious browser hijacker from Google Chrome browser. Procedures on this page are written in a manner that can be easily understand and execute by Mac users.

Quick Fix - Scan the System with Combo Cleaner

Combo Cleaner is a trusted Mac utility application with complete antivirus and optimization features. It is useful in dealing with adware, malware, and PUP's. Moreover, it can get rid of malicious browser hijacker like Nimbostratus. You may need to purchase full version if you require to maximize its premium features.

1. Download the tool from the following page:

2. Double-click the downloaded file and proceed with the installation.

3. In the opened window, drag and drop the Combo Cleaner icon onto your Applications folder icon.

Install Combo Cleaner

4. Open your Launchpad and click on the Combo Cleaner icon.

5. Wait until antivirus downloads its latest virus definition updates and click on "Start Combo Scan" to start removing Nimbostratus.

Combo Cleaner Scanner

6. Free features of Combo Cleaner include Disk Cleaner, Big Files finder, Duplicate files finder, and Uninstaller. To use antivirus and privacy scanner, users have to upgrade to a premium version.

Proceed with the rest of the removal steps if you are comfortable manually removing malicious objects associated with the threat.

Step 1 : Delete Suspicious Google Chrome Extension on Mac

Most adware and unwanted programs are using a program called browser extension to be able to take over the settings of internet applications. Therefore, we highly recommend to check and remove the extension that is closely related to Nimbostratus.

1. Open Google Chrome browser.

2. Type chrome://extensions/ in the address bar and press Enter on keyboard.

Chrome URL on Mac

3. Find Nimbostratus or relevant entry and remove it from Google Chrome.

If unable to remove Nimbostratus because browser is "Managed by your Organization", follow these steps:

1. Activate the Developer mode on Extensions window by using the slider.

2. Then, copy or take note of the browser Extension ID.

Screenshot of Chrome Manage ID

3. Open Finder on your Mac and go to the following directory:

~/Library/Application Support/Google/Chrome/Default/Extensions

4. Once you opened the directory, find the folder that matches the Extension ID and delete it.

5. Please restart your Google Chrome browser.

Aside from this straightforward workaround, we have a separate comprehensive guide to fix the Managed by Organization issue. You can also execute that guide if the steps on this page are not enough to delete Nimbostratus.

Step 2 : Delete Nimbostratus from Mac Applications

1. Go to Finder.

2. On the menu, click Go and then, select Applications from the list to open Applications Folder.

3. Find Nimbostratus or any unwanted program.

Delete Unwanted App

4. Drag Nimbostratus to Trash Bin to delete the application from Mac.

5. Right-click on Trash icon and click on Empty Trash.

Step 3 : Delete Malicious Files that have installed Nimbostratus

1. Select and copy the string below to your Clipboard by pressing Command + C on your keyboard.

~/Library/LaunchAgents

2. Go to your Finder. From the menu bar please select Go > Go to Folder...

3. Press Command + V on your keyboard to paste the copied string. Press Return to go to the said folder.

Command + V

4. You will now see a folder named LaunchAgents. Take note of the following files inside the folder:

  • unknown.download.plist
  • unknown.ltvbit.plist
  • unknown.update.plist
  • com.unknown

The term unknown is just a representation of the actual malware name. It is normally an unfamiliar file name such as the following:

- Nimbostratus

If you cannot find the specified file, please look for any unfamiliar or suspicious entries. It may be the one causing Nimbostratus to be present on your Mac. Arranging all items to see the most latest ones may also help you identify recently installed unfamiliar files. Please press Option + Command + 4 on your keyboard to arrange the application list in chronological order.

Option+Command+4

Important: Take note of all the suspicious files as you may also delete the same item on another folder as we go on.

5. Drag all suspicious files that you may find to Trash.

6. Please restart the computer.

7. Open another folder using the same method as above. Copy and Paste the following string to easily locate the folder.

~/Library/Application Support

8. Look for any suspicious items that are similar to the ones in Step 4. Drag them to the Trash.

9. Repeat the process on the following non-hidden folders (without ~):

/Library/LaunchAgents
/Library/LaunchDaemons
/Library/Application Support
/Library/Preferences

Optional : For locked files that cannot be removed, do the following:

1. Go to Launchpad, Utilities folder, open Activity Monitor.

2. Select the process you want to quit.

Force Quit Apps

3. Click on Force Quit button.

4. You may now delete or remove locked files that belongs to Nimbostratus homepage hijacker.

Step 4 : Double-check with MBAM Tool for Mac

1. Download Malwarebytes Anti-malware for Mac from the link below.

2. Run Malwarebytes Anti-malware for Mac. It will check for updates and download if most recent version is available. This is necessary in finding recent malware threats including Nimbostratus.

3. If it prompts to close all running web browser, please do so. Thus, we advise you to PRINT this guide for your reference before going offline.

4. Once it opens the user interface, please click on Scan button to start scanning your Mac computer.

MBAM for Mac

5. After the scan, Malwarebytes Anti-malware for Mac will display a list of identified threats, Nimbostratus is surely part of it. Be sure to select all items in the list. Then, click Remove button to clean the computer.

Step 5 : Remove Nimbostratus from Homepage and Search

Google Chrome

- Open Chrome browser.
- Type the following on the address bar and press Enter on keyboard : chrome://settings/
- Look for 'On Startup' area.
- Select 'Open a specific page or set of pages'.
- Click on More Actions and select Edit.
- Enter the desired web address as your home page, replacing Nimbostratus. Click Save.
- To set default search engine, go to Search Engine area.
- Click on 'Manage search engines...' button.
- Go to questionable Search Engine. Click on More Actions and Click 'Remove from list'.
- Go back to Search Engine area and choose valid entry from Search engine used in the address bar.

Nimbostratus Removal Procedure for PC

Below is a systematic instruction that is very useful in getting rid of the potentially unwanted program (PUP) from compromised computer. In order to totally eliminate the threat, it is vital to follow the process in exact manner.

Quick Fix - Scan the PC with Combo Cleaner

Combo Cleaner is a trusted PC utility application with complete antivirus and optimization features. It is useful in dealing with adware, malware, and PUP's. Moreover, it can get rid of malicious browser extension like Nimbostratus that is responsible for displaying unknown homepage and pop-ups.

To quickly remove Nimbostratus without going through the complicated process, please click on the button to download the removal tool. You may need to purchase full version if you require to maximize its premium features.

Proceed with the rest of the removal steps if you are comfortable manually removing malicious objects associated with the threat. The following guides are also vital in deleting malicious items from the browser configuration.

Step 1 : Get Rid of Unwanted Google Chrome Extension

The above procedures should have totally eliminated the browser hijacker. However, if you still find that there are still remnants of Nimbostratus on internet application, please proceed to manual removal of associated objects as outlined below.

1. Open Google Chrome browser.

2. Type chrome://extensions/ in the address bar and press Enter on keyboard.

Chrome URL

3. Find Nimbostratus or relevant entry and remove it from Google Chrome.

If you cannot remove Nimbostratus because "Your Browser is Managed by your Organization", do the following:

1. Activate the Developer mode on Extensions window by using the slider.

2. Then, copy or take note of the browser Extension ID.

Chrome Manage ID on PC

3. Open Windows Explorer and locate the following folder:

C:\Users\(Your Username)\AppData\Local\Google\Chrome\User Data\Default\Extensions

4. After opening the Folder, find the item that matches the Extension ID and delete it.

5. Please restart your Google Chrome browser.

Aside from this straightforward workaround, we have a separate comprehensive guide to fix the Managed by Organization issue. You can also execute that guide if the steps on this page are not enough to delete Nimbostratus.

Step 2 : Scan the computer with Sophos Antivirus

To remove Nimbostratus automatically, scanning the computer with this powerful anti-virus tool is recommended. This scanner does not just uncover known threats like viruses or malware, it is also effective in discovering browser hijacker like Nimbostratus that slows down online browsing activities.

1. Download Sophos Virus Removal Tool from the link below. Save the file on your computer where you can easily access it.

2. Once the download completes, browse the location of the file. Double-click to run the program and begin the install process.

Screenshot of Sophos Installer

3. On first windows of installation wizard, click Next to continue. Then, it will display the program’s License Agreement. You need to Accept the terms in order to proceed. If Windows prompts for User Account Control, please click Yes to proceed.

Screenshot of Sophos EULA Page

4. On succeeding windows, click Next or Continue to carry on with the installation. After completing the installation process, Launch Sophos Virus Removal Tool.

5. Internet connection is required when running this scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove malicious program like Nimbostratus.

6. Click the  button to  carry out the Scan. This will check the system for presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Nimbostratus+ and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

The above procedures should have totally eliminated the Nimbostratus browser hijacker. However, if you found that there are still remnants of the threat, please proceed to manual removal of associated objects as outlined below.

Step 3 : Scan with AdwCleaner and Reset Chrome Policies

In addition to the procedure, we suggest scanning the computer with AdwCleaner tool. Possibly, there are some traces of Nimbostratus on the browser that was not deleted during the preceding steps. This tool will scan the computer and check for presence of malicious applications.

1. Follow the link below to download the tool called AdwCleaner.

2. When the download has completed, please close all running programs on the computer, especially browsers affected by Nimbostratus.

3. Browse the location of the downloaded file and double-click on adwcleaner_Ver.exe to start running the tool. Then, click on the scan button.

4. On the AdwCleaner Dashboard, click on Settings.

Image of AdwCleaner Dashboard

5. While in the Settings window, please turn On the Reset Chrome Policies option.

Image of AdwCleaner Settings for Chrome

6. Go back to the Dashboard and click the Scan button.

7. AdwCleaner searches the computer for malicious programs, extensions, plug-ins, adware, and any items that may be associated with Nimbostratus.

8. Clean or Remove all suspicious and harmful items identified after the thorough scan.

9. After the cleanup procedure, rebooting the computer is required to finalize the removal of detected threats.

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