W32.Refaz

1. Displays a message with the following text:
   
   Title:
   BETA VERSION
   
   Message:
   Version limited time expired.
   
   
   
   
2. Copies itself as the following files:
   
   
   • %Windir%\winshell.exe
   • %Windir%\win_3k.exe
   • %Windir%\Zafer.exe
   • a:\ForYou.pif
   • C:\inetpub\wwwroot\xradiat.exe
     
     Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
     
     
3. Creates the following files:
   
   
   • C:\url.vxd
   • C:\Zafer.scr
     
     
4. Creates further copies of itself. The name of the file is chosen by randomly selecting from the following list and adding an .exe extension:
   
   
   • Ad-Aware 6.0
   • Spybot 1.3
   • Icq 4
   • WinZip 9.
   • Imesh
   • LimeWire
   • Morpheus
   • Avant Browser
   • Icq Pro 003b
   • RealPlayer
   • DivX Player (with DivX Codec)
   • Download Accelerator Plus
   • WinRAR
   • MSN Toolbar
   • Trillian Messenger
   • Warez peer to peer
   • Registry Mechanic
   • Adobe Acrobat Reader
   • Spyware Doctor
   • VirtualLab Data Recovery
   • Ares Galaxy
   • Yahoo Messenger
   • NetPumper
   • ZoneAlarm
   • FlashGet
   • eMule
   • RoboForm
   • SpyHunter
   • BitComet
   • dBpowerAmp Music Converter
   • HijackThis
   • All-in-One Secretmaker
   • JetAudio Basic
   • Nero 6 Ultra Edition Video Ads Blocker
   • Kazaa Download Accelerator Pro
   • AOL Instant Messenger (AIM)
   • MSN Messenger (Windows XP)
   • QuickTime
   • Bazooka Adware and Spyware Scanner
   • Ad-aware 6 Reference File
   • SolSuite 004 - Solitaire Card Games Suite
   • Microsoft Windows Media Player
   • Webroot Spy Sweeper
   • Norton AntiVirus Definitions Update (i3 Package)
   • WS_FTP LE
   • WinPatrol
   • Winamp Pro 004 Edition
   • Avast Home Edition
     
     The files are created in the following folders used by file sharing applications:
     
     
   • %ProgramFiles%\KaZaA\My Shared Folder
   • %ProgramFiles%\edonkey2000\incoming
   • %ProgramFiles%\gnucleus\downloads
   • %ProgramFiles%\icq\shared files
   • %ProgramFiles%\kazaa lite\My Shared Folder
   • %ProgramFiles%\limewire\shared
   • %ProgramFiles%\morpheus\my shared folder
   • %ProgramFiles%\Grokster\My Grokster
   • %ProgramFiles%\WinMX\My Shared Folder
   • %ProgramFiles%\Tesla\Files
   • %ProgramFiles%\Overnet\Incoming
   • %ProgramFiles%\XoloX\Downloads
   • %ProgramFiles%\Rapigator\Share
   • %ProgramFiles%\KMD\My Shared Folder
     
     Note: %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
     
     
5. Modifies the following files:
   
   
   • C:\inetpub\wwwroot\index.htm
   • C:\inetpub\wwwroot\index.html
   • C:\inetpub\wwwroot\index.php
   • C:\inetpub\wwwroot\Default.htm
   • C:\inetpub\wwwroot\Default.html
   • C:\inetpub\wwwroot\Default.php
     
     with the following content:
     
     Title:
     You need Xradiat
     
     Body:
     Welcome to our new website!
     to see our new stuff you need Xradiat plugin!
     http: //www.microsoft.com/downloa25ds/xradiat/
     
     Note: The URL links to a copy of the worm at C:\inetpub\wwwroot\xradiat.exe.
     
     
6. Adds the user Zafer to the administrator group.
   
   
7. Runs the telnet.exe program.
   
   
8. Searches for open network shares on the local network and copies itself as clean_service.cmd to the following folders on the remote computer:
   
   
   • \Documents and Settings\All Users\Start Menu
   • \Programs\Startup\WINDOWS\Start Menu
   • \Programs\Startup\WINDOWS\Meninicio
   • \Programas\Inicio\WINNT\Profiles\All Users\Start Menu
   • \Programs\Startup
   • [file sharing application root directory]
     
     
9. Adds the following line to autoexec.bat on the remote computer, so that it is executed when Windows starts:
   
   @start [path to clean_service.cmd]
   
   
10. Adds the following line to win.ini on the remote computer so that the worm runs when Windows starts:
    
    run=[path to clean_service.cmd]

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.