How to Remove HostaSieboldiana Extension

Failure to see the attack committed by the HostaSieboldiana hijacker on the browser may lead to further troubles. Sadly, becoming a victim of this search hijacker is accomplished with less effort by attackers; however, it gives users too much difficulty to get rid of the threat. Also known as a successor to PelargoniumHortorum and AltostratusUndulatus, HostaSieboldiana is a traditional example of a present-day browser threat that can execute various payloads once inside the computer. Below are just some of its payloads after infecting the browser:

Homepage Override

HostaSieboldiana is a browser hijacker that operates alongside a malicious browser extension. Users may have installed this browser app accidentally via malicious freeware. Without the user’s consent, it commits unwanted changes to the browser program, and this is very evident on the homepage, which showcases a new layout and an unknown URL of HostaSieboldiana.

Search Hijacking

Another task of HostaSieboldiana is to hijack the online search activities of web users. When performing online searches, it may not be visible, but the search queries of web users are diverted to HostaSieboldiana before they receive the final search result. This was accomplished so that HostaSieboldiana can harvest data from web users like search keywords, the origin of the searcher, browser type and version, and so on.

Personal Data Logging

Aside from search-related information, HostaSieboldiana is able to collect personally identifiable data from the browser, which may include sensitive credentials like usernames, passwords, email addresses, contact numbers, and IP addresses. The amass data from the browser can give HostaSieboldiana makers hints on the basic requirements needed to pull off a high-risk phishing attack on web users.

Excessive Ads

Being stuck in the browser, HostaSieboldiana takes the opportunity to gain revenue for its handlers. It produces different types of advertisements that span through the series of redirects, which aim to divert browser programs to different harmful pages offering unusual products like bogus optimization apps, fake anti-virus software, or phony software updates.

Screenshot of HostaSieboldiana

Where did it come from?

Most browser hijackers, including HostaSieboldiana come from malicious software or trick websites that people accidentally visit. These malicious apps often employ operating system or browser flaws to get illegal access. After installation, they alter browser preferences, sending users to dangerous websites and inserting unsolicited advertisements, jeopardizing their online privacy and maybe raising new security concerns.

What to do with HostaSieboldiana Extension?

Lack of action in removing HostaSieboldiana browser hijackers could eventually lead to a more serious malware or virus infection. As stated, pop-ups and redirects originating from this threat may lead internet programs to malicious pages hosting harmful codes and apps. Thus, immediate computer cleanup is advised to remove HostaSieboldiana from the browser and restore it to its previous safe working condition.

Procedures to Remove HostaSieboldiana 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 HostaSieboldiana. 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 HostaSieboldiana.

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 HostaSieboldiana.

1. Open Google Chrome browser.

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

Chrome URL on Mac

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

If unable to remove HostaSieboldiana 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 HostaSieboldiana.

Step 2 : Delete HostaSieboldiana 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 HostaSieboldiana or any unwanted program.

Delete Unwanted App

4. Drag HostaSieboldiana 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 HostaSieboldiana

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:

- HostaSieboldiana

If you cannot find the specified file, please look for any unfamiliar or suspicious entries. It may be the one causing HostaSieboldiana 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 HostaSieboldiana 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 HostaSieboldiana.

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, HostaSieboldiana 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 HostaSieboldiana 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 HostaSieboldiana. 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.

HostaSieboldiana 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 HostaSieboldiana that is responsible for displaying unknown homepage and pop-ups.

To quickly remove HostaSieboldiana 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 HostaSieboldiana 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 HostaSieboldiana or relevant entry and remove it from Google Chrome.

If you cannot remove HostaSieboldiana 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 HostaSieboldiana.

Step 2 : Scan the computer with Sophos Antivirus

To remove HostaSieboldiana 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 HostaSieboldiana 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 HostaSieboldiana.

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 HostaSieboldiana+ and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

The above procedures should have totally eliminated the HostaSieboldiana 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 HostaSieboldiana 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 HostaSieboldiana.

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 HostaSieboldiana.

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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