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Undefined.com virus. How to remove? (Uninstall guide)

removal by Gabriel E. Hall - - | Type: Browser hijacker
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If you see Undefined.com page when you open your Internet browser, it is not a good sign. Actually, it means that your computer was infected with a low-level computer threat, which belongs to the category called ‘browser hijackers.’ We have prepared this report on this PC intruder to spread the knowledge about it and how to avoid being infected with this threat. If you want to gain this knowledge, proceed to the next paragraph.

What happens when Undefined.com hijacks computer?

Once Undefined.com hijacker enters the computer system, it immediately places its files on the system. It also attaches some extensions to every Internet browser that you have on your computer. Then this potentially unwanted program (PUP) starts to track your activity. It monitors everything that you do on the Internet – what websites do you visit, what terms do you enter to boxes on search pages, and so on. Take note that Undefined.com PUP can also obtain data like geolocation of your PC and IP address. Warning! Some security vendors claim that this dubious browser hijacker can track personal information, for instance, credit card numbers, logins, passwords, and other sensitive data. Be careful! However, this is not the worst thing what Undefined.com hijacker does.

Undefined.com hijack

Another suspicious fact is that this page can perform some arbitrary changes on your computer – it can change your web browser’s homepage to Undefined.com search page without your permission asked. It might also display super intrusive ads that pop-up on the screen randomly. Moreover, this dangerous computer parasite can cause Undefined.com redirects to related third-party sites. Such redirects can occur unexpectedly because this rogue page tends to modify its search results, reroute you to its own search page when you try to use a different search engine, and so on. These vague redirects generate pay-per-click profit for Undefined.com developers because they create a web traffic to particular websites. Be very attentive, because some of these websites may be malicious, and you might download a hazardous program to your computer with no intention to do that. To avoid such risks and to clean your computer from this threat, we suggest using anti-malware software, for example, Reimage. It can find all components of this program and successfully remove them.

How did I get infected with Undefined.com hijacker?

The developers of PUPs are not very creative these days – they use one and most popular method to spread their doubtful apps in an indirect way. This bogus distribution technique is called bundling, and it allows to pack several apps into one software package. However, such pack looks like an individual program, so users can hardly recognize that it holds questionable attachments. To avoid installing them unwillingly, you have to:

  1. Do not rush when you install new programs.
  2. Read Terms of Use document. Look for information that discloses the existence of optional apps attached to your preferred program.
  3. Set safe installation settings. Avoid choosing Default/Standard/Basic options; instead, opt for Advanced or Custom one.
  4. Deselect suggestions to install sponsored third-party apps.

To find out how to remove Undefined.com virus, go to page 2 and read the removal instructions that our research team has prepared for you.

How to remove this dangerous browser hijacker?

You can remove Undefined.com virus manually (instructions, how to do it, are provided below the text), but we do not recommend doing so. This parasite might have hidden its files deeply in your system, and you might not be able to find all of them on your own. That is why we recommend installing a reputable anti-malware software that can detect and eliminate this rogue program automatically. If you have any questions regarding this virus, please leave a comment below or send us a question via ‘Ask us’ section. Good luck!

You can remove Undefined.com automatically with a help of one of these programs: Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus, Malwarebytes Anti Malware. We recommend these applications because they can easily delete potentially unwanted programs and viruses with all their files and registry entries that are related to them.

We might be affiliated with any product we recommend on the site. Full disclosure in our Agreement of Use. By Downloading any provided Anti-spyware software to remove Undefined.com virus you agree to our privacy policy and agreement of use.
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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall Undefined.com virus. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

More information about this program can be found in Reimage review.

More information about this program can be found in Reimage review.

Manual Undefined.com virus Removal Guide:

WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove Undefined.com from Windows systems

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Click Start Control Panel Programs and Features (if you are Windows XP user, click on Add/Remove Programs).Click 'Start -> Control Panel -> Programs and Features' (if you are 'Windows XP' user, click on 'Add/Remove Programs').
  2. If you are Windows 10 / Windows 8 user, then right-click in the lower left corner of the screen. Once Quick Access Menu shows up, select Control Panel and Uninstall a Program. If you are 'Windows 10 / Windows 8' user, then right-click in the lower left corner of the screen. Once 'Quick Access Menu' shows up, select 'Control Panel' and 'Uninstall a Program'.
  3. Uninstall Undefined.com and related programs
    Here, look for Undefined.com or any other recently installed suspicious programs.
  4. Uninstall them and click OK to save these changes. Right click on each of suspicious entries and select 'Uninstall'
  5. Remove Undefined.com from Windows shortcuts
    Right click on the shortcut of Mozilla Firefox and select Properties. Right click on browsers' icon and select 'Properties'
  6. Go to Shortcut tab and look at the Target field. Delete malicious URL that is related to your virus. Select 'Shortcut' tab and delete 'http://isearch.babylon.com...' or other suspicious URL

Repeat steps that are given above with all browsers' shortcuts, including Internet Explorer and Google Chrome. Make sure you check all locations of these shortcuts, including Desktop, Start Menu and taskbar.

WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove Undefined.com from Mac OS X system

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. If you are using OS X, click Go button at the top left of the screen and select Applications. Cick 'Go' and select 'Applications'
  2. Wait until you see Applications folder and look for Undefined.com or any other suspicious programs on it. Now right click on every of such entries and select Move to Trash.Click on every malicious entry and select 'Move to Trash'
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove Undefined.com from Internet Explorer (IE)

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Remove dangerous add-ons
    Open Internet Explorer, click on the Gear icon (IE menu) on the top right corner of the browser and choose Manage Add-ons. Click on menu icon and select 'Manage add-ons'
  2. You will see a Manage Add-ons window. Here, look for Undefined.com and other suspicious plugins. Disable these entries by clicking Disable: Right click on each of malicious entries and select 'Disable'
  3. Change your homepage if it was altered by virus:
    Click on the gear icon (menu) on the top right corner of the browser and select Internet Options. Stay in General tab.
  4. Here, remove malicious URL and enter preferable domain name. Click Apply to save changes. Delete malicious URL, enter your desired domain name and click 'Apply' to save changes
  5. Reset Internet Explorer
    Click on the gear icon (menu) again and select Internet options. Go to Advanced tab.
  6. Here, select Reset.
  7. When in the new window, check Delete personal settings and select Reset again to complete Undefined.com removal. Go to 'Advanced' tab and click on 'Reset' button. Now select 'Delete personal settings' and click on 'Reset' button again
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove Undefined.com virus from Microsoft Edge

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

Reset Microsoft Edge settings (Method 1):

  1. Launch Microsoft Edge app and click More (three dots at the top right corner of the screen).
  2. Click Settings to open more options.
  3. Once Settings window shows up, click Choose what to clear button under Clear browsing data option. Go to Settings and select 'Choose what to clear'
  4. Here, select all what you want to remove and click Clear. Select 'Clear' button
  5. Now you should right-click on the Start button (Windows logo). Here, select Task Manager. Open the start menu and select 'Task Manager'
  6. When in Processes tab, search for Microsoft Edge.
  7. Right-click on it and choose Go to details option. If can’t see Go to details option, click More details and repeat previous steps. Right-click 'Microsoft Edge' and select 'Go to details' Select 'More details' if 'Go to details' option fails to show up
  8. When Details tab shows up, find every entry with Microsoft Edge name in it. Right click on each of them and select End Task to end these entries. Find Microsoft Edge entries and select 'End Task'

Resetting Microsoft Edge browser (Method 2):

If Method 1 failed to help you, you need to use an advanced Edge reset method.

  1. Note: you need to backup your data before using this method.
  2. Find this folder on your computer: C:\Users\%username%\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe.
  3. Select every entry which is saved on it and right click with your mouse. Then Delete option. Go to Microsoft Edge folder on your computer, right-click every entry and click 'Delete'
  4. Click the Start button (Windows logo) and type in window power in Search my stuff line.
  5. Right-click the Windows PowerShell entry and choose Run as administrator. Find Windows PowerShell, right-click it and select 'Run as administrator'
  6. Once Administrator: Windows PowerShell window shows up, paste this command line after PS C:\WINDOWS\system32> and press Enter:
    Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register $($_.InstallLocation)\AppXManifest.xml -Verbose}
    Copy and paste a required command and press 'Enter'

Once these steps are finished, Undefined.com should be removed from your Microsoft Edge browser.

WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove Undefined.com from Mozilla Firefox (FF)

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Remove dangerous extensions
    Open Mozilla Firefox, click on the menu icon (top right corner) and select Add-ons Extensions. Click on menu icon and select 'Add-ons'
  2. Here, select Undefined.com and other questionable plugins. Click Remove to delete these entries. Select 'Extensions' and look for malicious entries. Click 'Remove' to get rid of each of them
  3. Change your homepage if it was altered by virus:
    Click on the menu (top right corner), choose Options General.
  4. Here, delete malicious URL and enter preferable website or click Restore to default.
  5. Click OK to save these changes. When in 'General' tab, delete malicious URL from 'Home Page' section or click on 'Restore to Default' button. Click 'OK' to save changes
  6. Reset Mozilla Firefox
    Click on the Firefox menu on the top left and click on the question mark. Here, choose Troubleshooting Information. Click on menu icon and then on '?'. Select 'Troubleshooting Information'
  7. Now you will see Reset Firefox to its default state message with Reset Firefox button. Click this button for several times and complete Undefined.com removal. Click on 'Reset Firefox' button for a couple of times
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove Undefined.com from Google Chrome

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Delete malicious plugins
    Open Google Chrome, click on the menu icon (top right corner) and select Tools Extensions. Click on menu icon. Select 'Tools' and 'Extensions'
  2. Here, select Undefined.com and other malicious plugins and select trash icon to delete these entries. Look for malicious entries and delete each of them by clicking on the Trash bin icon
  3. Change your homepage and default search engine if it was altered by your virus
    Click on menu icon and choose Settings.
  4. Here, look for the Open a specific page or set of pages under On startup option and click on Set pages. After clicking on menu and 'Settings', select 'Set pages'
  5. Now you should see another window. Here, delete malicious search sites and enter the one that you want to use as your homepage. Click 'X' to remove malicious URLs
  6. Click on menu icon again and choose Settings Manage Search engines under the Search section. When in 'Settings', select 'Manage search engines...'
  7. When in Search Engines..., remove malicious search sites. You should leave only Google or your preferred domain name. Click 'X' to remove malicious URLs
  8. Reset Google Chrome
    Click on menu icon on the top right of your Google Chrome and select Settings.
  9. Scroll down to the end of the page and click on Reset browser settings. When in 'Settings', scroll down to 'Reset browser settings' button and click on it
  10. Click Reset to confirm this action and complete Undefined.com removal. Click on 'Reset' button to complete your removal
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove Undefined.com from Safari

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Remove dangerous extensions
    Open Safari web browser and click on Safari in menu at the top left of the screen. Once you do this, select Preferences. Click on 'Safari' and select 'Preferences'
  2. Here, select Extensions and look for Undefined.com or other suspicious entries. Click on the Uninstall button to get rid each of them. Go to 'Extensions' and uninstall malicious add-ons
  3. Change your homepage if it was altered by virus:
    Open your Safari web browser and click on Safari in menu section. Here, select Preferences as it was displayed previously and select General.
  4. Here, look at the Homepage field. If it was altered by Undefined.com, remove unwanted link and enter the one that you want to use for your searches. Remember to include the "http://" before typing in the address of the page. When in 'General', delete malicious URL and enter your desired domain name
  5. Reset Safari
    Open Safari browser and click on Safari in menu section at the top left of the screen. Here, select Reset Safari.... Click on 'Safari' and select 'Reset Safari...'
  6. Now you will see a detailed dialog window filled with reset options. All of those options are usually checked, but you can specify which of them you want to reset. Click the Reset button to complete Undefined.com removal process. Select all options and click on 'Reset' button
After uninstalling this potentially unwanted program (PUP) and fixing each of your web browsers, we recommend you to scan your PC system with a reputable anti-spyware. This will help you to get rid of Undefined.com registry traces and will also identify related parasites or possible malware infections on your computer. For that you can use our top-rated malware remover: Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware.

About the author

Gabriel E. Hall
Gabriel E. Hall - Passionate web researcher

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  • rickrooss

    it collects banking information?!!! im removing it ASAP!! i was using its search site for a while! jesus

  • steffanella

    I have got infected with this nasty thing as well. Now its gone, but I will definitely install an anti-malware program to keep my PC safe.

  • 0832

    scary hijacker, I thought they collect non-identifiable information only for web traffic analysis purposes?