Discovered: December 11, 2005
Updated: February 13, 2007 12:49:50 PM
Type: Worm
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
When W32.Dinoxi.B is executed, it performs the following actions:
- Displays a message with the following characteristics:
Title: ERROR
Message Body: An unexpected error has occurred on the execution of this file.
- Creates the following files:
- C:\Documents and Settings\All Users\Start Menu\Programs\Startup\WinDash.EXE
- %System%\WinOIE789.exe
- %Windir%\Fonts\FontLoader.exe
- %ProgramFiles%\NetMeeting\NetMeeting.exe
Notes:
- %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
- %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
- %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
- Adds the value:
"ScanRegistry" = ""
to the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
so that the worm runs every time Windows starts.
- Adds the value:
"SchedulingAgent" = ""
to the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
so that the worm runs every time Windows starts.
- Adds the values:
"DisableTaskmgr" = "1"
"DisableRegistryTools" = "1"
to the registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
to disable the Windows Task Manager and the Registry Editor.
- Adds the value:
"Disabled" = "1"
to the registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WinOldApp
to modify settings on the compromised computer and make it difficult to remove the threat.
- Adds the value:
"NoDevMgrPage" = "1"
to the registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
to disable the Device Manager page.
- Adds the value:
"NoRealMode" = "1"
to the registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WinOldApp
to disable real mode DOS.
- Adds the values:
"NoRun" = "hex:01,00,"
"NoFind" = "1"
"NoClose" = "hex:01,00,"
"NoLogOff" = "hex:01,00,"
"NoDrives" = "3FFFFFF"
"NoDesktop" = "1"
"NoSaveSettings" = "hex:00,00,"
"NoViewContextMenu" = "hex:01,00,"
"NoTrayContextMenu" = "hex:01,00,"
"RestrictRun" = "1"
"NoSetFolders" = "F4240"
"NoFavoritesMenu" = "1"
"NoRecentDocsMenu" = "1"
"NoSetTaskbar" = "1"
to the registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
in order to change Windows Explorer settings.
- Adds the value:
"NoBrowserClose" = "1"
to the registry subkey:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Restrictions
to disable the option of closing Internet Explorer.
- Modifies the value:
"Start Page" = "[http:]//www.ud7swe.t35.com/[REMOVED]/3wY26ss.com"
in the registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
in order to change the Internet Explorer start page.
- Modifies the values:
"LegalNoticeCaption" = "??????"
"LegalNoticeText" = "???????????"
in the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Winlogon
to display a message that is all question marks (?) before the user logs on.
- Modifies the value:
"NoDesktop" = "1"
in the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
to hide all the items and programs on the Windows desktop.
- Modifies the value:
"(Default)" = "C:\Windows\System\Browseui.dll-"
in the registry subkey:
HKEY_CLASSES_ROOT\CLSID\{01E04581-4EEE-11d0-BFE9-00AA005B4383}\InProcServer32
to hide Address Bar from Internet Explorer.
- Modifies the value:
"@" = "txtfile"
in the registry subkeys:
HKEY_CLASSES_ROOT\.inf
HKEY_CLASSES_ROOT\.reg
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.inf
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.reg
- Modifies the value:
"@" ="rem [ViewFolder(%l, %I, %S)]"
in the registry subkeys:
HKEY_CLASSES_ROOT\Folder\shell\explore\ddeexec
HKEY_CLASSES_ROOT\Folder\shell\open\ddeexec
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\explore\ddeexec
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\open\ddeexec
- Modifies the values:
"s1159" = "??????"
"s2359" = "??????"
"STimeFormat" = "HH:mm:ss tt"
in the registry subkey:
HKEY_CURRENT_USER\Control Panel\International
to change the time format settings.
- Modifies the value:
"KeyboardDelay" = "9"
in the registry subkey:
HKEY_CURRENT_USER\Control Panel\Keyboard
to delay a character from repeating when the key for that character is held down.
- Modifies the values:
"D2oubleClickSpeed" = "100"
"MouseSensitivity" = "5"
"MouseSpeed" = "0"
"SwapMouseButtons" = "1"
in the registry subkey:
HKEY_CURRENT_USER\Control Panel\Mouse
to change the mouse settings.
- Sends an instant message to all the AOL Instant Messenger contacts on the compromised computer.
This message contains one of the following strings:
- LMAO OMG THIS IS HILARIOUS!
- INFINITE FREE PICS OF ASIAN HOTTIES!
- Lol OMG! Someone posted your picture here!
- Cool hacking programs!
- Play the new Aim Online game!
- Click to join! Better then myspace and xanga!
- Wanna See My Profile!
- Download My Profile.
- LOL Check these Pics out.
- Have you see this!
- Take my Quiz!
- Download my mp3 i made.
- Check out my music!
- Funniest Clip Ever!
- Download Dead Aim (5.9+)- NEW!
- Check out my webcam.
- See my Beach pictures!!
- Make your own Profile!
- THE KEY TO HAPPINESS IS LAUGHTER!
- Join this free music site!
- View My BuddyProfile
- My Xanga!
- LOL Watch this clip!
- LOLOL WTF IS THIS?!
- Free Aim Password Cracker. Use it to hack your friends.
- This game is badass! Play now!
- Email Hacker Pro 1.5 This is awsome! :)
- Game Hacker program download here.
- Aim Hacker 1.3 FREE!
- ate32class
- Better then limewire and kazaa put together!
- Get X-im Chat! Better then AIM!
- Best Aim Password Cracker written by ZeX.
- Download Aim Optimized 4.9!
- Hack Webcams and Aim accounts with O-Hax! This is the last day it will be out for free!
These messages will contain the following link, which will download a copy of itself, if clicked:
[http:]//www.yu9.us/[REMOVED]o.exe
- Spreads through peer-to-peer file sharing applications by dropping copies of itself into the following folders:
- C:\Program Files\Morpheus\My Shared Folder
- C:\Program Files\Blubster\My Shared Folder
- C:\Program Files\Ares\My Shared Folder
- C:\Program Files\iMesh\iMesh5\Data\Playlists
- C:\Program Files\Grokster\My Shared Folder
- C:\Program Files\gnucleus\downloads
- C:\Program Files\Kazaa\My Shared Folder
- C:\Program Files\limeWire\Shared
- C:\My Shared Folder
- C:\Program Files\KMD\My Shared Folder
- C:\Program Files\ICQ\shared files
- C:\Program Files\Shareaza\Downloads
- C:\Program Files\Edonkey2000\incoming
- C:\Program Files\overnet\incoming
- C:\Program Files\winmx\shared
- C:\Program Files\XoloX\Downloads
- C:\Program Files\Tesla\Files
- C:\Program Files\Warez P2P Client\My Shared Folder
- C:\program files\rapigator\share
- C:\Program Files\Files\Kazaa Lite\My Shared Folder
- D:\My Downloads
- D:\Program Files\Files\Kazaa Lite\My Shared Folder
- D:\Program Files\Files\Kazaa\My Shared Folder
- D:\Program Files\Shareaza\Downloads
- D:\Program Files\Morpheus\My Shared Folder
- D:\My Shared Folder
- D:\Program Files\limewire\shared
- D:\Program Files\winmx\shared
- D:\Program Files\Warez P2P Client\My Shared Folder
- D:\Program Files\Edonkey2000\incoming
- D:\Program Files\overnet\incoming
- D:\Program Files\bearshare\shared
- D:\Program Files\iMesh\iMesh5\Data\Playlists
- E:\My Downloads
- E:\Program Files\Files\Kazaa Lite\My Shared Folder
- E:\Program Files\Files\Kazaa\My Shared Folder
- E:\Program Files\Shareaza\Downloads
- E:\Program Files\Morpheus\My Shared Folder
- E:\My Shared Folder
- E:\Program Files\limewire\shared
- E:\Program Files\winmx\shared
- E:\Program Files\Warez P2P Client\My Shared Folder
- E:\Program Files\Edonkey2000\incoming
- E:\Program Files\overnet\incoming
- E:\Program Files\bearshare\shared
- E:\Program Files\iMesh\iMesh5\Data\Playlists
- Copies itself into shared folders, or the folder where the worm was executed, using any of the following file names:
- PS2 Emulator
- PS2 Emulator by Zim
- PS2 Rom Extractor
- XBOX Rom Extractor
- XBOX Emulator
- XBOX Emulator by zim
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- Opens a back door by connecting to a predetermined location, using a random port, and listening for commands. These commands allow a remote attacker to perform various actions on the compromised computer, including downloading and executing remote files.
Recommendations
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
- Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
- Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
- Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
- Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
- Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
- Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
- If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
- Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
- Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
- Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
- Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
- If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
- For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Kaoru Hayashi
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