Spyware.CWSMil

Spyware.CWSMil

Updated:
February 13, 2007
Risk Impact:
High
File Names:
mgs_32.dll
Systems Affected:
Windows

Behavior


Spyware.CWSMil sends information about visited websites to a third party.

Symptoms


Files are detected as Spyware.CWSMil.

Behavior


Spyware.CWSMil can be installed manually or by an ActiveX control on some Web sites (known as a drive-by download).

Antivirus Protection Dates

  • Initial Rapid Release version October 02, 2014 revision 022
  • Latest Rapid Release version March 23, 2017 revision 037
  • Initial Daily Certified version April 13, 2005
  • Latest Daily Certified version March 23, 2017 revision 041
  • Initial Weekly Certified release date April 13, 2005
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When the installer for Spyware.CWSMil is executed, it
  1. Creates the following file:

    • %System%\mgs_32.dll

  2. Registers the dropped dll as a browser help object by creating and populating the following registry keys:

    • HKEY_CLASSES_ROOT\Ml.IEHlprObj.1
    • HKEY_CLASSES_ROOT\Ml.IEHlprObj
    • HKEY_CLASSES_ROOT\CLSID\{150FA160-130D-451F-B863-B655061432BA}
    • HKEY_CLASSES_ROOT\TypeLib\{A65529DD-4833-4784-A594-205F4A50267A}
    • HKEY_CLASSES_ROOT\Interface\{7142C3E1-1FE1-4A2A-B882-681DC7DB0D30}

  3. Every time a web site is visited in Internet Explorer, the browser helper object uses a HTTP query to send data about the visit to a third party.



The following instructions pertain to all Symantec antivirus products that support security risk detection.
    1. Update the definitions.
    2. Close all open Internet Explorer windows
    3. Run a full system scan.
    4. Delete any values added to the registry.
    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 close all open Internet Explorer windows
    Because Spyware.CWSMil functions as a Microsoft Internet Explorer plugin, it is necessary to close all open Internet Explorer windows to remove it. If you are reading this writeup in Internet Explorer, print this writeup using our printer-friendly option at the top of the page, or write down the following instructions, and then close all Internet Explorer windows.


    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 Spyware.CWSMil 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 risk 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 risk 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 risk for this scan only, and thus, the risk 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. Restart the computer in Normal mode.

      • 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. Restart the computer in Normal mode.

    4. To delete the value from 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 subkeys only. Read the document: How to make a backup of the Windows registry, for instructions.

    1. Click Start > Run.

    2. Type regedit

      Then click OK.

    3. Navigate to and delete the following registry keys:

      • HKEY_CLASSES_ROOT\Ml.IEHlprObj.1
      • HKEY_CLASSES_ROOT\Ml.IEHlprObj
      • HKEY_CLASSES_ROOT\CLSID\{150FA160-130D-451F-B863-B655061432BA}
      • HKEY_CLASSES_ROOT\TypeLib\{A65529DD-4833-4784-A594-205F4A50267A}
      • HKEY_CLASSES_ROOT\Interface\{7142C3E1-1FE1-4A2A-B882-681DC7DB0D30}

    4. Exit the Registry Editor.