SecurityRisk.BrosExt

SecurityRisk.BrosExt

Updated:
13 February 2007
Risk Impact:
High
Systems Affected:
Windows

Behavior


SecurityRisk.BrosExt is a program that modifies some registry entries.

Symptoms


The file is detected as SecurityRisk.BrosExt.

Behavior


SecurityRisk.BrosExt must be intentionally installed on the computer.

Antivirus Protection Dates

  • Initial Rapid Release version 02 October 2014 revision 022
  • Latest Rapid Release version 01 February 2015 revision 020
  • Initial Daily Certified version 03 September 2004
  • Latest Daily Certified version 17 January 2008 revision 033
  • Initial Weekly Certified release date 08 September 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When SecurityRisk.BrosExt is executed, it performs the following actions:

  1. Adds the value:

    "pnpsvc_lock" = "[FILE NAME]"

    in the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that it runs each time that you start Windows.

  2. Modifies or adds the value to:

    "Enable Browser Extensions" = "yes"

    in the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main

  3. Modifies or adds the value to:

    "PendingFileRenameOperations" = "\??\[FILE NAME]"

    in the registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager

    which will delete the file at next system startup.

  4. Deletes the values in the following registry entries:

    HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\DNSCache
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pnpsvc
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pnpsvc\Enum
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Application\pnpsvc
    HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\pnpsvc
    HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\pnpsvc\Enum
    HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\pnpsvc\Parameters
    HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\pnpsvc



The following instructions pertain to all Symantec antivirus products that support Security Risk detection.
  1. Update the definitions.
  2. Run a full system scan.
  3. Delete the value that was 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 run the scan
  1. Start your Symantec antivirus program, and then run a full system scan.
  2. If any files are detected as SecurityRisk.BrosExt 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.


3. 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 keys 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 the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "pnpsvc_lock"= "[FILE NAME]"

  5. Exit the Registry Editor.