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05 September 2014
Risk Impact:
Systems Affected:


Adware.Mezaa is an adware program that displays ads in the computer's browser.

Antivirus Protection Dates

  • Initial Rapid Release version 02 October 2014 revision 022
  • Latest Rapid Release version 21 August 2019 revision 022
  • Initial Daily Certified version 05 September 2014 revision 007
  • Latest Daily Certified version 04 November 2019 revision 050
  • Initial Weekly Certified release date 10 September 2014
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
When the program is executed, it creates the following files:
  • %Temp%\MLSP.ini.log
  • %Temp%\MZAr.log
  • %Temp%\SpOrder.dll
  • %AllUsersProfile%\Application Data\Mezaa\config.mezaa
  • %AllUsersProfile%\Application Data\Mezaa\Logo.ico
  • %AllUsersProfile%\Application Data\Mezaa\mezaa.log
  • %ProgramFiles%\Mezaa\DynLib.dll
  • %ProgramFiles%\Mezaa\install.log
  • %ProgramFiles%\Mezaa\Interop.PCProxyLib.dll
  • %ProgramFiles%\Mezaa\mezaa-win-upgrader.exe
  • %ProgramFiles%\Mezaa\Mezaa.Library.dll
  • %ProgramFiles%\Mezaa\Mezaa.Service.exe
  • %ProgramFiles%\Mezaa\MezaaControl.exe
  • %ProgramFiles%\Mezaa\MezaaSvc.exe
  • %ProgramFiles%\Mezaa\MezaaTray.exe
  • %ProgramFiles%\Mezaa\MezaaUp.exe
  • %ProgramFiles%\Mezaa\MLSP.exe
  • %ProgramFiles%\Mezaa\MLSP.ini
  • %ProgramFiles%\Mezaa\MLSP64.exe
  • %ProgramFiles%\Mezaa\MZA.dll
  • %ProgramFiles%\Mezaa\MZA.exe
  • %ProgramFiles%\Mezaa\MZA64.dll
  • %ProgramFiles%\Mezaa\PAD_FILE.xml
  • %ProgramFiles%\Mezaa\Uninstall.exe
  • %System%\MZA.dll
  • %Temp%\MZA.log
  • %Temp%\MZAr.log

It then creates services with the following properties:

Display Names:

  • MezvcV1
  • MezvcV2
  • MZA

Image Paths:
  • %ProgramFiles%\Mezaa\MezaaSvc.exe
  • %ProgramFiles%\Mezaa\Mezaa.Service.exe
  • %ProgramFiles%\Mezaa\MZA.exe

  • Sets and maintains Mezaa protection on this computer
  • Service Mezaa
  • Sets and maintains MZA LSP protection on this computer

It then creates the following registry subkeys to register itself as services:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1
  • KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA

It also creates the following registry entries:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\Enum\"0" = "Root\LEGACY_MEZVCV1\0000"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\Enum\"Count" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\Enum\"NextInstance" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\Security\"Security" = "[HEXADECIMAL VALUE]"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"Type" = "10"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"Start" = "2"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"ErrorControl" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"ImagePath" = "%ProgramFiles%\Mezaa\MezaaSvc.exe"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"DisplayName" = "MezvcV1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"DependOnService" = "WINMGMT"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"DependOnGroup" = "0"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"ObjectName" = "LocalSystem"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV1\"Description" = "Sets and maintains Mezaa protection on this computer"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\Enum\"0" = "Root\LEGACY_MEZVCV2\0000"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\Enum\"Count" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\Enum\"NextInstance" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\Security\"Security" = "[HEXADECIMAL VALUE]"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"Type" = "10"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"Start" = "2"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"ErrorControl" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"ImagePath" = "%ProgramFiles%\Mezaa\Mezaa.Service.exe"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"DisplayName" = "MezvcV2"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"DependOnService" = "WINMGMT"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"DependOnGroup" = "0"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"ObjectName" = "LocalSystem"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"Description" = "Service Mezaa"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MezvcV2\"FailureActions" = "[HEXADECIMAL VALUE]"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\Enum\"0" = "Root\LEGACY_MZA\0000"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\Enum\"Count" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\Enum\"NextInstance" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\Security\"Security" = "[HEXADECIMAL VALUE]"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"Type" "10"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"Start" = "2"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"ErrorControl" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"ImagePath" = "%ProgramFiles%\Mezaa\MZA.exe"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"DisplayName" = "MZA"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"DependOnService" = "RPCSS"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"DependOnGroup" = "0"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"ObjectName" = "LocalSystem"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MZA\"Description" = "Sets and maintains MZA LSP protection on this computer"

The program highlights specific words in Web pages and displays ads when the user moves the cursor over the words.

You may have arrived at this page either because you have been alerted by your Symantec product about this risk, or you are concerned that your computer has been affected by this risk.

Before proceeding further we recommend that you run a full system scan . If that does not resolve the problem you can try one of the options available below.

If you are a Norton product user, we recommend you try the following resources to remove this risk.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resources provide further information and best practices to help reduce the risk of infection.

If you are a Symantec business product user, we recommend you try the following resources to remove this risk.

Identifying and submitting suspect files
Submitting suspicious files to Symantec allows us to ensure that our protection capabilities keep up with the ever-changing threat landscape. Submitted files are analyzed by Symantec Security Response and, where necessary, updated definitions are immediately distributed through LiveUpdate™ to all Symantec end points. This ensures that other computers nearby are protected from attack. The following resources may help in identifying suspicious files for submission to Symantec.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resource provides further information and best practices to help reduce the risk of infection.
Protecting your business network

The following instructions pertain to all current Symantec antivirus products.

1. Performing a full system scan
How to run a full system scan using your Symantec product

2. Restoring settings in the registry
Many risks make modifications to the registry, which could impact the functionality or performance of the compromised computer. While many of these modifications can be restored through various Windows components, it may be necessary to edit the registry. See in the Technical Details of this writeup for information about which registry keys were created or modified. Delete registry subkeys and entries created by the risk and return all modified registry entries to their previous values.