Adware:W32/DuDu

Classification

Category :

Spyware

Type :

Adware

Summary

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

Removal

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.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

The online installer for the DuDu Accelerator is a downloader agent, retrieving its setup binary installer from a remote site. An adware program may be bundled with the DuDu accelerator installer. Alternatively, some installers retrieve a second installer, which delivers the adware program to the system.

The adware program may be known by a variety of names, such as Desktop-Media and IE-Bar.

Installation

When the retrieved DUDU Accelerator installer is dropped onto the system and executed by a freeware or shareware application, the following files are dropped:

  • \%UserProfile%\Local Settings\Temp\remotesetup.exe& - DuDu Accelerator downloader installer
  • \%UserProfile%\Local Settings\Temp\dddsetup.exe - destination file of the binary to be downloaded
  • \%UserProfile%\Local Settings\Temp\dddsetup.ini - initialization file
  • \%AllUsersProfile%\Application Data\DuDu
  • \%AllUsersProfile%\Application Data\DuDu\DddOEM
  • \%AllUsersProfile%\Application Data\DuDu\DddOEM\OemData.dat - data file

Where %UserProfile% refers to the current user's profile folder, the default installation pathway being "C:\Documents and Settings\[CURRENT USER]" (Windows NT/2000/XP).

In addition, the following file is dropped:

  • \%WINDIR%\Tasks\DDD_Install_Program.job& - Windows task job that launches every hour

Where %WINDIR%refers to the Windows folder, the default installation pathway being "C:\Windows" (Windows 95/98/Me/XP) or "C:\Winnt" (Windows NT/2000).

This installer will then install the DuDu Accelerator program, with the extra adware program, by dropping the following files:

  • \%Program Files%\%AdwareProgramFolder%
  • \%Program Files%\%AdwareProgramFolder%\Cast
  • \%Program Files%\%AdwareProgramFolder%\Cast\%Version%
  • \%Program Files%\%AdwareProgramFolder%\Cast\%Version%\dmbar.dll
  • \%Program Files%\%AdwareProgramFolder%\Cast\%Version%
  • \%Program Files%\%AdwareProgramFolder%\Cast\%Version%\dmplayer.dll
  • \%Program Files%\%AdwareProgramFolder%\Cast\dmbar.dll
  • \%Program Files%\%AdwareProgramFolder%\Cast\dmipn.dll
  • \%Program Files%\%AdwareProgramFolder%\Cast\dmsched.exe
  • \%Program Files%\%AdwareProgramFolder%\Cast\dmshell.dll
  • \%Program Files%\%AdwareProgramFolder%\Cast\license.txt
  • \%Program Files%\%AdwareProgramFolder%\Cast\UnInstall.exe

Where %ProgramFiles% refers to the program files directory, the default installation pathway being "c:\Program Files";&%AdwareProgramFolder% refers to the program folder used by the adware; and %Version% refers to the folder where it signifies the program version (usually in a 4 digit, 1.2.3.4 format)&

Some of these binary files are also being detected as Adware.Win32.Dm

  • \%AllUsersProfile%\Application Data\Share Helper
  • \%AllUsersProfile%\Application Data\Share Helper\Cast
  • \%AllUsersProfile%\Application Data\Share Helper\Cast\GGS
  • \%AllUsersProfile%\Application Data\Share Helper\Cast\yxssj_2140.inf
  • \%AllUsersProfile%\Start Menu\Programs\Startup\IE-BAR.lnk - autorun

Where %AllUsersProfile% refers to the all user's profile folder, the default installation pathway being "C:\Documents and Settings\All Users" (Windows NT/2000/XP).

Registry

During installation, the program creates the following key:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SharedDlls\%ProgramFiles%\[adware program folder]\Cast\dmshell.dll = 1

Notes

The adware program may contact to the remote site dmcast.com to retrieve a random advertisement. It may also checkyahoo.com.cn to confirm if it is connected to the internet.

Registry Modifications

Creates these keys:

  • HKEY_LOCAL_MACHINE\SOFTWARE\sharehelper
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Dmbar.dmbar
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Dmbar.dmbar.1
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{16358834-52FC-4981-9A79-BFECE7C08CD3}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1FCA37BA-7259-4BF1-878B-A39FA83BFBBB}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6A2FF9B4-C31C-4BE8-86D4-4443B7411FE5}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Features\71C455D361DEA8443BECF6CB15FF7B50
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\UpgradeCodes\5DB62E375A896F6408081040C15B769B
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{8C9377D3-D823-46A6-A8AC-B3913F9B6CA2}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{25649A6A-637D-4416-9D03-98146330492A}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Explorer Bars\{1FCA37BA-7259-4BF1-878B-A39FA83BFBBB}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UpgradeCodes\5DB62E375A896F6408081040C15B769B
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{3D554C17-ED16-448A-B3CE-6FBC51FFB705}