Help to Get Rid of PUP.Optional.Cassiopessa

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PUP.Optional.Cassiopessa is kind of Trojan in the Internet world and it is more harmful than users expected. When PUP.Optional.Cassiopessa enters on your PC, it is indicative of that you will encounter endless troubles from then on and it can’t be removed easily. PUP.Optional.Cassiopessa is able to open the entry for virus infection and it will incapacitate the protecting function of your security software. And when virus enter, you feel nothing and don’t know what is going on until your PC becomes vulnerable and frequently stops working.

Besides, PUP.Optional.Cassiopessa can add password on your documents if you don’t allow it. It can still do it without your consent, and most of time you will be not aware of this. When you try to open this documents, you begins to notice something wrong. And it will show you how to solve it if you make some payment. Then, you have to either give up the documents or give it money to exchange the documents back.

PUP.Optional.Cassiopessa will enter into your PC through several things. Normally they are spam email, porn sites, or fake updated links, and so forth. And it always attaches itself on these things and get into your PC without consent.

If you have already decided to removed PUP.Optional.Cassiopessa, it would encounter problems when you installed it since you could not even detect it. therefore, we provide some removal guides for your reference. Please refer to it.

The harms of PUP.Optional.Cassiopessa:

1.It can bring more virus and malware to your PC without any notifications;
2.It installs malicious extensions to bombard you with annoying ads on all web browsers;
3.It is able to make change on your crucial system settings to make your machine vulnerable;
4.It completely takes over your browsers by altering their settings;
5.It may help scammers record your browsing activities and collect your personal data;
6.It triggers various system errors and malfunctions.

PUP.Optional.Cassiopessa Removal Tutorial for PC Users and Mac OS Users

Note: Windows PC users should read the Part 1; Mac OS Users should read Part 2

Part 1 – Remove PUP.Optional.Cassiopessa from Windows PCs

First Method – Manually Remove PUP.Optional.Cassiopessa (For Users with Expert Skills)

Second Method – Automatically Remove PUP.Optional.Cassiopessa Quickly and Safely (Easy For All Computer Users)

First Method – PUP.Optional.Cassiopessa Manual Removal

Step 1 – End PUP.Optional.Cassiopessa process in Task Manager.

1. Press “Ctrl+ Shift + Esc” keys to call out Windows Task Manager
2. Click Processes > find PUP.Optional.Cassiopessa process or suspicious processes and select End process.

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Step 2 – Uninstall PUP.Optional.Cassiopessa and suspicious programs from Control Panel.

Windows 10 : Click Start Menu >> Click All Apps >> Find out PUP.Optional.Cassiopessa and other unwanted programs, then right-click on it and select Uninstall:

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Windows 8
– Move the mouse to the lower-left corner of the screen and clicking the Start button;
– Type “control panel” in search box and then click Control Panel.
– Find PUP.Optional.Cassiopessa and unwanted programs >> click Uninstall

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Win 7 / Vista / XP
– Click Start button >> click Control Panel in Start Menu
– Click Uninstall a program to open Programs and Features
– Find PUP.Optional.Cassiopessa and unwanted programs >> click Uninstall

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Step 3 Remove PUP.Optional.Cassiopessa and related extensions / add-on on web browser.

Google Chrome:
Click the Chrome menu on the browser toolbar >> click Tools >> click Extensions >> Click the trash can icon to remove PUP.Optional.Cassiopessa and unwanted extensions

Internet Explorer:
Open Internet Explorer >> click Tools button >> click Manage add-ons >> Remove or Disable the PUP.Optional.Cassiopessa and related add-on

Mozilla Firefox:
Click the menu button on firefox >> click Add-ons >> select the Extensions or Appearance panel >> remove PUP.Optional.Cassiopessa and unwanted or unknown extensions

Microsoft Edge:

This browser do not have extensions or add-on sections, you just need to reset homepage and search engine to remove hijacker installed by PUP.Optional.Cassiopessa :

1. Set your homepage page on Microsoft Edge to remove hijacker virus.

  • Select More (…) on the address bar, then Settings
  • Under Open with, select A specific page or pages
  • select Custom to enter the URL of page you want to set as homepage

2 . Set your default search engine to remove search redirect virus.

  • Select More (…) on the address bar, then Settings
  • Click View advanced settings
  • Click <Add new> under “Search in the address bar with”, then input the search engine you like
  • Now select the search engine you like and click Add as default

Step 4 Remove PUP.Optional.Cassiopessa related registry files in Registry.

– Press Win + R keys together to open Run window
– Type “regedit” and click OK
– Find out all related registry files of PUP.Optional.Cassiopessa:

HKEY_CURRENT_USERSoftwareMicrosoftInternet ExplorerMain “Default_Page_URL”
HKEY_LOCAL_Machine\Software\Classes\[adware name]
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run “.exe”
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\random
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings “CertificateRevocation” = ’0

Second Method – PUP.Optional.Cassiopessa Automatic Removal

Step 1 – Scan your computer with SpyHuner Malware Scanner and remove PUP.Optional.Cassiopessa and other threats:

If you are not a advanced PC users with rich experience and knowledge on handling PC virus, we highly recommend you to use SpyHunter Malware Scanner to get rid of PUP.Optional.Cassiopessa with ease and without risk.

– Click the button below to Download SpyHuner Malware Scanner safely:





*Free version of SpyHunter will help you detect unsafe items for free. After it detects dangerous items, you can locate their paths and manually get rid of them on your own if you have rich experience on manual virus removal; In case manual removal is too difficult for you, you have choice to purchase its full version to remove the virus automatically. Meanwhile, the full version of SpyHunter will offers you unlimited one-on-one professional help for any malware related issue by its official PC expert. If you want to uninstall it, follow steps on this guide: Guide to Uninstall SpyHunter / RegHunter. )


– Now double-click SpyHunter-Installer.exe to install it:

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Now click Star New Scan and click Scan Computer Now to detect PUP.Optional.Cassiopessa and related viruses.

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Once it completes the scan, click Fix Threats to remove PUP.Optional.Cassiopessa and other viruses.

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Step 2 Run RegHunter to Fix Registry Error and Security Bugs Caused by PUP.Optional.Cassiopessa.

To prevent PUP.Optional.Cassiopessa coming back after system restart, you need to recover your Registry to healthy status and fix all the security bugs / exploits caused by PUP.Optional.Cassiopessa. But please note that Registry is one of the most complicated and import section to a system, we should always be carefully while having any operations in it. Therefore, if you are not a computer expert, it’s wise to use a reliable tool to help you fix the Registry and security bugs automatically. Our tech team has tested different Registry fixer and system optimizer, and ranked RegHunter as the best tool which can help users fix all the system errors including Registry error, BSOD error and system crash. Download it to recover your PC to the best status with top performance.


– Click the button below to donwload RegHunter System Optimizer:

* If you want to remove it, follow steps in this guide: Guide to Uninstall SpyHunter / RegHunter. Free version of RegHunter provides unlimited free scans and detection. After it detects corrupted registry files and system errors files, you can follow the scan results to manually replace them with healthy files copied from healthy PC on your own; or to purchase its full version to automatically fix the Registry and errors with ease. Meanwhile, the full version of RegHunter will offers you great features to optimize your system performance.

Now double-click RegHunter-Installer.exe to install it
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– Click “Scan for Registry Errors Now” to detect corrupted files and fix all errors caused by PUP.Optional.Cassiopessa:

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– Click “Repair All Errors” to fix Registry and optimize system performance:

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Step 3 (Optional) Run Avast Internet Security (100% Free Version) to re-check your PC and protect your privacy:


Part 2 – Remove PUP.Optional.Cassiopessa from Mac OS

Step 1 – Disable or Remove nasty extensions installed by PUP.Optional.Cassiopessa from Safari, Firefox and Chrome.


– Choose Safari > Preferences.
– Click the Security pane.
– Click Manage Website Settings to see plug-in details for a particular website.
– Internet plug-ins installed on your computer appear on the left side of the plug-ins sheet. Select a plug-in to configure its website settings.
– Websites that are currently open in Safari appear on the right side of the plug-ins sheet. Websites that you have already configured by clicking “Trust” or “Cancel” also appear here.
– You can select Ask, Block, Allow, Allow Always and Runs in Unsafe Mode under “When visiting other websites:”. Select Block to disable plugin and Allow or Allow Always to enable.

Mozilla Firefox:

– Click the orange “Firefox” button in the top left-hand corner of the browser window and choose “Add-ons” from the right column of the menu to open an Add-ons Manager tab in the active browser window.
– If you are using Windows XP, click on “Tools” from the menu bar near the top of the browser window and choose “Add-ons.”
– Click “Extensions” to view the installed extensions that add features to Firefox, or click “Plugins” to view plugins that add compatibility and functionality.
– Find the add-on you want to disable and click its “Disable” button.
– If you want to delete an extension entirely, click “Remove.”

Google Chrome:

– Click the menu icon “” at the top right of the browser window, choose “Tools” and choose “Extensions” to open a new “Options” tab.
– Uncheck “Enabled” to disable an extension, or click “Remove” to delete it completely.
– Enter “chrome://plugins/” in Chrome’s address bar to view plugins that add compatibility and functionality, such as Apple QuickTime or Adobe Flash,
– Click the “Disable” link under the plugin you want to disable.

Step 2 – Install Professional PUP.Optional.Cassiopessa Removal Tool – MacBooster Lite to detect and remove all infections connected with PUP.Optional.Cassiopessa and speed up your Mac.

MacBooster Lite is one of the most powerful and popular anti-malware and optimization app designed for Mac OS. It is developed to help Mac users clean, speed up and optimizing Mac machines. With the greats features such as Internet Security, System Cleanup, System Optimization and Disk Clean, you can keep your Mac away from virus and malware attack and avoid online spam and phishing websites and protect your privacy and files well. Our lab has tested it and confirmed that MacBooster can help you get rid of PUP.Optional.Cassiopessa and other threats completely and easily. Now install it and let it serves you now:

1. Click “Free Download” button here to download and install MacBooster quickly:

2. Once installed, MacBooster will diagnose System Status of your Mac and then you can fix all errors and remove all detected infections completely:

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Why Thousands of Mac Users Recommend MacBooster:

MacBooster can assist you to solve all kind of issues with just one click. It clears out junk files to speed up your Mac, detects and removes various infections, identifies big or duplicated files that take up large portion of hard disk, and helps you uninstall unwanted apps that won’t easily go away. It is the ultimate tool you will need to keep your Mac machines running fast and safely. Here are the useful functions you can get from MacBooster:

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Tips on Prevent Virus and Malware Such as PUP.Optional.Cassiopessa

If you want to keep your PC from all kinds viruses and malware active online, you need to always follow these rules while using your PC:1. Always choose Custom Installation while installing freeware so that you can deselect unwanted options or cancel unauthorized change;2. Always scan attachments in emails before you open it; never open any attachment or click links on emails which you do not know if it is safe;3. Do not visit any porn website because most of porn websites embedded with malicious codes from cyber criminal;4. Always scan torrent files and other files downloaded from third party website before you open them;5. Never update any of your software from third party website; make sure the software update alert appearing on your screen is from official website;6. Do not click ads (e.g. “Ads by “, “Ads brought by “, “Ads powered by “, etc. ) which do not belong to the websites you visit.