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Removal instructions for Mass Sea

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What is Mass Sea?

The Malwarebytes research team has determined that Mass Sea is a browser hijacker. These so-called "hijackers" manipulate your browser(s), for example to change your startpage or searchscopes, so that the affected browser visits their site or one of their choice. This one also displays advertisements.

How do I know if my computer is affected by Mass Sea?

You may see this browser extension:

Firefox disables the unsigned Extension

and this entry in your list of installed programs:


How did Mass Sea get on my computer?

Browser hijackers use different methods for distributing themselves. This particular one was bundled with other software.

How do I remove Mass Sea?

Our program Malwarebytes Anti-Malware can detect and remove this potentially unwanted application.
  • Please download Malwarebytes Anti-Malware to your desktop.
  • Double-click mbam-setup-version.exe and follow the prompts to install the program.
  • At the end, be sure a check-mark is placed next to the following:
    • Enable free trial of Malwarebytes Anti-Malware Premium
    • Launch Malwarebytes Anti-Malware
  • Then click Finish.
  • If an update is found, you will be prompted to download and install the latest version.
  • Once the program has loaded, select Scan Now. Or select the Threat Scan from the Scan menu.
  • When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
  • Restart your computer when prompted to do so.
Is there anything else I need to do to get rid of Mass Sea?
  • No, Malwarebytes Anti-Malware removes Mass Sea completely.
  • If you are using Firefox, you may have to remove the Extension manually under Add-ons > Extensions. Click on the Remove button behind the Mass Sea entry.
How would the full version of Malwarebytes Anti-Malware help protect me?

We hope our application and this guide have helped you eradicate this hijacker.

As you can see below the full version of Malwarebytes Anti-Malware would have protected you against the Mass Sea hijacker. It would have warned you before the application could install itself, giving you a chance to stop it before it became too late.


Technical details for experts

Possible signs in FRST logs:
 FF Extension: Mass Sea - C:\Users\{username}\AppData\Roaming\Mozilla\Firefox\Profiles\{profile}.default\Extensions\firefox@www.masssea.com.xpi [2016-06-30] [not signed]
 C:\Program Files (x86)\Mass Sea

Mass Sea (HKLM-x32\...\Mass Sea) (Version: 2.0.6025.39420 - Mass Sea) <==== ATTENTION
Alterations made by the installer:
File system details [View: All details] (Selection)
    Adds the folder C:\Program Files (x86)\Mass Sea
       Adds the file 7za.exe"="7/1/2016 1:09 AM, 536064 bytes, A
       Adds the file Uninstaller.exe"="7/1/2016 6:54 AM, 386240 bytes, A
    Adds the folder C:\Program Files (x86)\Mass Sea\Extensions
       Adds the file firefox@www.masssea.com.xpi"="6/30/2016 11:01 AM, 9011 bytes, A
    Adds the folder C:\Users\{username}\AppData\Roaming\Mozilla\Firefox\Profiles\{profile}.default\extensions
       Adds the file firefox@www.masssea.com.xpi"="6/30/2016 11:01 AM, 9011 bytes, A

Registry details [View: All details] (Selection)
       "(Default)"="REG_SZ", "1"
       "{99415057-7C50-439D-AA20-02D83C071B61}"="REG_SZ", "{99415057-7C50-439D-AA20-02D83C071B61}"
       "1"="REG_SZ", ""
       "(Default)"="REG_SZ", "288036a4-2ec5-4b65-88ce-395bd04761b2"
       "cg"="REG_SZ", "288036a4-2ec5-4b65-88ce-395bd04761b2"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Mass Sea]
       "DisplayIcon"="REG_SZ", ""C:\Program Files (x86)\Mass Sea\uninstaller.exe""
       "DisplayName"="REG_SZ", "Mass Sea"
       "DisplayVersion"="REG_SZ", "2.0.6025.39420"
       "EstimatedSize"="REG_DWORD", 909
       "HelpLink"="REG_SZ", "mailto:support@masssea.com"
       "InstallDate"="REG_SZ", "20160701"
       "InstallLocation"="REG_SZ", "C:\Program Files (x86)\Mass Sea"
       "NoModify"="REG_DWORD", 1
       "NoRepair"="REG_DWORD", 1
       "Publisher"="REG_SZ", "Mass Sea"
       "QuietUninstallString"="REG_SZ", ""C:\Program Files (x86)\Mass Sea\uninstaller.exe""
       "UninstallString"="REG_SZ", ""C:\Program Files (x86)\Mass Sea\uninstaller.exe""
       "URLInfoAbout"="REG_SZ", "http://www.masssea.com/support"
       "URLUpdateInfo"="REG_SZ", "http://www.masssea.com"
Malwarebytes Anti-Malware log:
Malwarebytes Anti-Malware

Scan Date: 7/1/2016
Scan Time: 9:57 AM
Logfile: mbamMassSea.txt
Administrator: Yes

Malware Database: v2016.07.01.02
Rootkit Database: v2016.05.27.01
License: Premium
Malware Protection: Disabled
Malicious Website Protection: Enabled
Self-protection: Enabled

OS: Windows 7 Service Pack 1
CPU: x64
File System: NTFS
User: {username}

Scan Type: Threat Scan
Result: Completed
Objects Scanned: 314082
Time Elapsed: 9 min, 3 sec

Memory: Enabled
Startup: Enabled
Filesystem: Enabled
Archives: Enabled
Rootkits: Enabled
Heuristics: Enabled
PUP: Enabled
PUM: Enabled

Processes: 0
(No malicious items detected)

Modules: 0
(No malicious items detected)

Registry Keys: 6
PUP.Optional.Yontoo, HKLM\SOFTWARE\WOW6432NODE\CLASSES\CLSID\{99415057-7C50-439D-AA20-02D83C071B61}, Quarantined, [4a8c25f978228da9404b5d14996933cd], 
PUP.Optional.Yontoo, HKLM\SOFTWARE\CLASSES\WOW6432NODE\CLSID\{99415057-7C50-439D-AA20-02D83C071B61}, Quarantined, [4a8c25f978228da9404b5d14996933cd], 
PUP.Optional.Yontoo, HKLM\SOFTWARE\WOW6432NODE\CLASSES\CLSID\{F83D1872-D9FF-47F8-B5A0-49CC51E24EE8}, Quarantined, [09cd899525755bdb4349ed8420e22cd4], 
PUP.Optional.Yontoo, HKLM\SOFTWARE\CLASSES\WOW6432NODE\CLSID\{F83D1872-D9FF-47F8-B5A0-49CC51E24EE8}, Quarantined, [09cd899525755bdb4349ed8420e22cd4], 
PUP.Optional.Yontoo, HKLM\SOFTWARE\WOW6432NODE\MICROSOFT\WINDOWS\CURRENTVERSION\UNINSTALL\Mass Sea, Quarantined, [7f57a5798b0f78be2ce008de966bac54], 
PUP.Optional.Yontoo, HKLM\SOFTWARE\WOW6432NODE\MassSea, Quarantined, [25b198862b6fef477d6acfd68d771fe1], 

Registry Values: 0
(No malicious items detected)

Registry Data: 0
(No malicious items detected)

Folders: 3
PUP.Optional.Yontoo, C:\Program Files (x86)\Mass Sea, Quarantined, [498d3ee00d8d47ef02dad7ced2328f71], 
PUP.Optional.Yontoo, C:\Program Files (x86)\Mass Sea\Extensions, Quarantined, [498d3ee00d8d47ef02dad7ced2328f71], 
PUP.Optional.Yontoo, C:\Users\{username}\AppData\Local\Temp\Mass Sea, Quarantined, [8d4954caabef62d4ae2fb6ef5fa5d32d], 

Files: 4
PUP.Optional.Yontoo, C:\Users\{username}\Desktop\setup.exe, Quarantined, [1bbb5bc38218ba7cbe28a8f9936e718f], 
PUP.Optional.Yontoo, C:\Program Files (x86)\Mass Sea\Uninstaller.exe, Quarantined, [7f57a5798b0f78be2ce008de966bac54], 
PUP.Optional.Yontoo, C:\Program Files (x86)\Mass Sea\7za.exe, Quarantined, [498d3ee00d8d47ef02dad7ced2328f71], 
PUP.Optional.Yontoo, C:\Program Files (x86)\Mass Sea\Extensions\firefox@www.masssea.com.xpi, Quarantined, [498d3ee00d8d47ef02dad7ced2328f71], 

Physical Sectors: 0
(No malicious items detected)

As mentioned before the full version of Malwarebytes Anti-Malware could have protected your computer against this threat.
We use different ways of protecting your computer(s):
  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention
Save yourself the hassle and get protected.
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