Chromstera is a potentially unwanted program or PUP. It is also on the list of adware that bombards the Internet browser with intrusive advertisements like pop-up windows and redirection. Chromstera was initially marketed as a browser extension that improved users’ online search capabilities. It asserts that it will deliver precise and recent results. Therefore, after installing the program, web users would see Chromstera’s negative side.
Unwanted installation of Chromstera
The majority of times this PUP is installed, computer users are unaware of it. Software bundling strategies are being used by the actors behind this suspicious program to distribute it to arbitrary computers. Chromstera is typically included in free applications, freeware, or shareware that users of the internet can download from a variety of websites and file-repository places. There is no warning or recommendation regarding the additional installation of Chromstera during the freeware installation. In actuality, relevant adware like SphyrnaMokarran 4.4 and Dark Mode Ext may infiltrate the computer in addition to the PUP described.
In other situations, online users were duped into installing a fake software update. These fake software upgrades frequently carry PUP’s and Adware without the users’ knowledge. The integrated Chromstera easily enters the computer because web users are sure that the program is necessary to enhance online browsing functionality after applying the software update.
Chromstera may show advertisements
When Chromstera is present, numerous advertisements, including pop-ups and redirects, may be displayed. Ads from this malware frequently contain malicious links that can direct browser pages to undesirable landing pages, making them more than simply ordinary annoyances. If accessed, the computer can become infected with more malware or adware.
In addition to the bothersome advertisements, it can also carry out dangerous acts that are not immediately apparent to online users. Chromstera was created with the purpose of gathering browsing data from an internet program. It can record search terms, favored websites, pages visited, IP addresses, and other information. The attackers may utilize the data they have collected in the future for further fraudulent online operations. So, in order to avoid this, online users need to erase Chromstera as soon as it shows up on their browser. Please see the next section for a detailed explanation.
Procedures to Remove Chromstera from Mac
This section contains comprehensive guide for Mac users. It will help you remove malicious browser hijacker from internet application.
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 Chromstera. 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.
4. Open your Launchpad and click on the Combo Cleaner icon.
5. Wait until antivirus downloads it's latest virus definition updates and click on "Start Combo Scan" to start removing Chromstera.
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 in manually removing malicious objects associated with the threat.
Step 1 : Delete Chromstera 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 Chromstera or any unwanted program.
4. Drag Chromstera to Trash Bin to delete the application from Mac.
5. Right-click on Trash icon and click on Empty Trash.
Step 2 : Remove Browser Extensions that belongs to Chromstera
1. Locate the add-on or extension that is relevant to the hijacker. To do this, please follow the following depending on affected browser.
Safari - Choose Preferences from the Safari menu, then click the Extensions icon. This will open a window showing all installed extensions.
Chrome - Select Preferences from the Chrome menu, and then click the Extensions link found on the left pane.
Firefox - Choose Add-ons from the Menu. Look at both the Extensions and Plug-ins lists when it opens a new window.
2. Once you have located Chromstera or any suspicious items, click on Remove or Uninstall, to get rid of it.
3. Close the browser and proceed to the next steps.
Step 3 : Delete Malicious Files that have installed Chromstera
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.
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:
- Chromstera
If you cannot find the specified file, please look for any unfamiliar or suspicious entries. It may be the one causing Chromstera 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.
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.
3. Click on Force Quit button.
4. You may now delete or remove locked files that belongs to Chromstera 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 Chromstera.
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.
5. After the scan, Malwarebytes Anti-malware for Mac will display a list of identified threats, Chromstera 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 Chromstera from Homepage and Search
Safari
- Open your Safari browser.
- Go to Safari Menu located on upper left hand corner, and then select Preferences.
- Under General tab, navigate to Default Search Engine section and select Google or any valid search engine.
- Next, be sure that "New Windows Open With" field is set to Homepage.
- Lastly, remove Chromstera from the Homepage field. Replace it with your preferred URL to be set as your default homepage.
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 Chromstera. 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.
Mozilla Firefox
- Run Mozilla Firefox browser.
- Type the following on the address bar and hit Enter on keyboard : about:preferences
- On Startup area, select 'Show your home page' under 'When Firefox starts' field.
- Under Home Page field, type the desired URL to replace Chromstera settings.
- To configure default search engine, select Search on left sidebar to display settings.
- Under Default Search Engine list, please select one.
- On the same page, you have an option to Remove unwanted search engine.
Step 6 : Delete Chromstera Login Items
Some browser hijacker may also install login item into compromised account under System Preferences. This object automatically runs Chromstera during user log in.
1. Go to Apple menu and choose System Preferences.
2. Select Users & Groups from the preferences window.
3. You may need to Unlock this area in order to make changes. Click on the Lock icon on lower left corner of the window.
4. Next, select user account that runs Chromstera.
5. Click on Login Items tab.
6. Select Chromstera or any suspicious entries from the list and click on the minus [-] button and confirm your actions. Please see image below for reference.
Optional : If unable to change browser settings, execute these steps:
Some user complains that there is no way to change browser settings because it is grayed out by Chromstera. In such situation, it is important to check if there is unwanted profile. Please do the following:
1. Quit any running applications and launch System Preferences from your Dock.
2. Under System Preferences, click Profiles.
3. Select , Chromstera or any relevant profile from the left pane. See image below.
4. At the bottom of this window, click minus [-] button to delete the account. Please refer to image above.
5. Close the Profiles window and open the affected browser to change all settings associated with Chromstera.
Chromstera 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 computer with Sophos Virus Removal Tool
To remove Chromstera automatically, scanning the computer with this powerful malware and virus removal app is recommended. This scanner does not just uncover known threats like viruses or malware, it is also effective in discovering browser hijacker like Chromstera 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.
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.
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 Chromstera.
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 Chromstera and other suspicious entities. Be sure to remove all identified threats.
The above procedures should have totally eliminated the browser hijacker. However, if you still find that there are still remnants of Chromstera on internet application, please proceed to manual removal of associated objects as outlined below.
Step 1 : Delete Browser Extension
Most adware and unwanted programs use an application called a "browser extension" to be able to take over the settings of internet applications. Therefore, we highly recommend checking and removing the extension that is closely related to Chromstera. If it is not present, look for and delete any suspicious browser extension.
Remove the Chromstera Extension from Google Chrome
1. Open your Google Chrome browser.
2. Type chrome://extensions/ in the address bar and press Enter on the keyboard.
3. Find Chromstera or any relevant entry and remove it from the Google Chrome browser.
Uninstall the Chromstera Extension from Mozilla Firefox
1. Open the Mozilla Firefox browser.
2. Type about:addons in the address bar and press Enter on the keyboard.
3. Choose Extensions from the sidebar menu.
4. Look for an object that pertains to Chromstera and remove it from the browser.
After deleting the malicious browser extension, it is expected that pop-ups and other troubles will be gone from the internet browser.
Remove Chromstera from Microsoft Windows and Edge Browser
1. On your keyboard, press Windows Key + R and then, type the appwiz.cpl command.
2. The Program and Features window will open. Arrange the list in a chronological manner, with recently installed applications on top. To do this, click on the 'Installed On' column.
3. Select Chromstera or a recently installed unwanted entry. Then, click on Uninstall to remove it from the Windows system.
If Chromstera is still present on the browser and there are still homepage and pop-ups, another option is to remove the adware from the browser settings.
4. Open the Microsoft Edge program.
5. Input edge://extensions/ in the URL bar and press Enter on the keyboard.
6. Look for and Remove or Disable entries for Chromstera from the Installed Extensions area. Additionally, delete the same object from the Search Providers section by executing the Hijacker Removal Procedure for Edge.
7. Close the window and restart Microsoft Edge.
Step 2 : Scan and Delete Adware with AdwCleaner
In addition to the procedure, we suggest scanning the computer with AdwCleaner tool. Possibly, there are some traces of Chromstera 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 Chromstera.
3. Browse the location of the downloaded file and double-click on adwcleaner_Ver.exe to start running the tool. Then, click on Scan button.
4. AdwCleaner searches the computer for malicious programs, extensions, plug-ins, adware, and any items that may be associated to Chromstera.
5. Clean or Remove all suspicious and harmful items identified after the thorough scan.
6. After the cleanup procedure, rebooting the computer is required to finalize the removal of detected threats.
