Threat Explorer

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Adware.ZeroPopUp

Adware.ZeroPopUp

Updated:
February 13, 2007
Version:
2.0
Risk Impact:
Medium
File Names:
zp.dll
Systems Affected:
Windows

Behavior


Adware.ZeroPopUp is an Internet Explorer Browser Helper Object that installs an Internet Explorer toolbar that has a Search bar and Pop Up stopper. It also takes over the Search settings to point the user to znext.com or searchxl.com.

This adware is related to an earlier version, TellaFriend.Trojan, but it does not have the Outlook Address book-spamming capability.

Symptoms


The files are detected as Adwareware.ZeroPopUp.

Behavior


This file is generally installed through an ActiveX installer.

Antivirus Protection Dates

  • Initial Rapid Release version October 02, 2014 revision 022
  • Latest Rapid Release version July 13, 2017 revision 025
  • Initial Daily Certified version September 18, 2004
  • Latest Daily Certified version July 14, 2017 revision 002
  • Initial Weekly Certified release date September 22, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Adware.ZeroPopUp is run, it does the following:
  1. Creates these files:
    • %InstallFolder%\zp.dll (the toolbar, detected as Adware.ZeroPopUp)
    • %InstallFolder%\spp.reg (registry keys to make it point to searchxl.com)
    • %InstallFolder%\zpp.inf (*.inf setup configuration file)

      Note: %InstallFolder% is a variable that refers to the folder to which these files were downloaded or extracted. It can be any folder.

  2. Modifies these values to:

    "Search Page"="http:/ /www.searchxl.com/ie"
    "Default_Search_URL"="http:/ /www.searchxl.com/ie"

    in the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main

  3. Modifies the value to:

    "Search Page"="http:/ /www.searchxl.com/ie"

    in the registry key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main

  4. Adds the value:

    "SearchAssistant"="http:/ /www.searchxl.com/ie"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Search

  5. Adds these values:

    "Use Search Asst"="no"
    "Use Custom Search URL"=dword:00000001
    "Default_Search_URL"="http:/ /www.searchxl.com/ie"
    "Search Bar"="http:/ /www.searchxl.com/ie"
    "SearchURL"="http:/ /www.searchxl.com/ie"

    to the registry key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main

  6. Adds the value:

    "SearchAssistant"="http:/ /www.searchxl.com/ie"

    to the registry key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Search

  7. Creates these registry keys:

    HKEY_CURRENT_USER\software\zeropopup
    HKEY_CLASSES_ROOT\CLSID\{72A58725-2635-4725-8C53-686DFD1FEB8D}



The following instructions pertain to all Symantec antivirus products that support Security Risk detection.
  1. Update the definitions.
  2. Unregister the zp.dll file.
  3. Run a full system scan.
  4. Reverse the changes that were made to the registry.
  5. Delete the remaining files.
For specific details on each of these steps, read the following instructions.

1. To update the definitions
To obtain the most recent definitions, start your Symantec program and run LiveUpdate.

2. To unregister the zp.dll file
  1. Click Start > Run.
  2. Type, or copy and paste, the following text:

    regsvr32 /u "%InstallFolder%\zp.dll"

    then click OK.

  3. If a dialog box confirming this action appears, click OK.

3. To run the scan
  1. Start your Symantec antivirus program, and then run a full system scan.
  2. If any files are detected as Adware.ZeroPopUp and depending on which software version you are using, you may see one or more of the following options:

    Note: This applies only to versions of Norton AntiVirus that support Security Risk detection. If you are running a version of Symantec AntiVirus Corporate Edition that supports Security Risk detection, and Security Risk detection has been enabled, you will only see a message box that gives the results of the scan. If you have questions in this situation, contact your network administrator.
    • Exclude (Not recommended): If you click this button, it will set the threat so that it is no longer detectable. That is, the antivirus program will keep the security risk on your computer and will no longer detect it to remove from your computer.

    • Ignore or Skip: This option tells the scanner to ignore the threat for this scan only. It will be detected again the next time that you run a scan.

    • Cancel: This option is new to Norton Antivirus 2005. It is used when Norton Antivirus 2005 has determined that it cannot delete a security risk. This Cancel option tells the scanner to ignore the threat for this scan only, and thus, the threat will be detected again the next time that you run a scan.

      To actually delete the security risk:
      • Click its file name (under the Filename column).
      • In the Item Information box that displays, write down the full path and file name.
      • Then use Windows Explorer to locate and delete the file.

        If Windows reports that it cannot delete the file, this indicates that the file is in use. In this situation, complete the rest of the instructions on this page, restart the computer in Safe mode, and then delete the file using Windows Explorer.

    • Delete: This option will attempt to delete the detected files. In some cases, the scanner will not be able to do this.
      • If you see a message, "Delete Failed" (or similar message), manually delete the file.
      • Click the file name of the threat that is under the Filename column.
      • In the Item Information box that displays, write down the full path and file name.
      • Then use Windows Explorer to locate and delete the file.

        If Windows reports that it cannot delete the file, this indicates that the file is in use. In this situation, complete the rest of the instructions on this page, restart the computer in Safe mode, and then delete the file using Windows Explorer.

4. To reverse the changes that were made to the registry

Important:
Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.


Note:
This is done to make sure that all the keys are removed. They may not be there if regsvr32 removed them.

  1. Click Start > Run.

  2. Type regedit

    Then click OK.

  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Search

  4. In the right pane, delete the value:

    "SearchAssistant"="http:/ /www.searchxl.com/ie"

  5. Navigate to the key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main

  6. In the right pane, delete the values:

    "Use Search Asst"="no"
    "Use Custom Search URL"=dword:00000001
    "Default_Search_URL"="http:/ /www.searchxl.com/ie"
    "Search Bar"="http:/ /www.searchxl.com/ie"
    "SearchURL"="http:/ /www.searchxl.com/ie"

  7. Navigate to the key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Search

  8. In the right pane, delete the value:

    "SearchAssistant"="http:/ /www.searchxl.com/ie"

  9. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main

  10. In the right pane, change the values:

    "Search Page"="http:/ /www.searchxl.com/ie"
    "Default_Search_URL"="http:/ /www.searchxl.com/ie"

    to:

    "Search Page"="http:/ /www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"
    "Default_Search_URL"="http:/ /www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"

  11. Navigate to the key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main

  12. In the right pane, change the value:

    "Search Page"="http:/ /www.searchxl.com/ie"

    to:

    "Search Page"="http:/ /www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"

  13. Delete the registry keys:

    HKEY_CURRENT_USER\software\zeropopup

    HKEY_CLASSES_ROOT\CLSID\{72A58725-2635-4725-8C53-686DFD1FEB8D

5. To delete the remaining files (if they exist)
    Using Windows Explorer, delete the following files:
      • %InstallFolder%\zp.dll
      • %InstallFolder%\spp.reg
      • %InstallFolder%\zpp.inf