This program delivers advertising content to the user. It is usually annoying but harmless, unless it is combined with spyware or trackware.


Automatic action

Based on the settings of your F-Secure security product, it may block the file from running, move it to the quarantine where it cannot spread or cause harm, or ask you to select an action.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

Adware:W32/Bestofer is one of the progams associated with "The Best Offer Networks" online advertising. When active, Bestofer contacts one of the "Best Offer Networks" servers to retrieve advertising content to display.&

Here's a sample screenshot of the adware information when it is installed:

Bestofer is distributed bundled together with several freeware applications.

Another adware that is related to this program is Adware:W32/BetterInternet.


During installation, the following files are created:

  • %windir%\tboninst.cfg
  • %windir%\TBONUnst.htm
  • %ProgramFiles%\tboninst.cfg
  • %ProgramFiles%\tbon.exe
  • %ProgramFiles%\Uninstall.exe

Where %WINDIR% refers to the Windows folder and the default installationpath is "C:\windows" (Windows 95/98/Me/XP) or "C:\Winnt" (Windows NT/2000). %ProgramFiles% refers to the program files directory and the default installation path is "c:\Program Files".


During installation, the following registry keys are created:

  • HKEY_CURRENT_USER\Software\tbonac
  • HKEY_CURRENT_USER\Software\Classes\tbonac
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uinstall\TBON
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run& tbon = [adware file]

Date Created: 2009-04-03 03:53:53.0

Date Last Modified: 2009-08-19 09:15:37.0