W32.Gavgent.A

1. Creates the following files:
   
   
   • C:\Windows\java\[User Name].exe
   • C:\Windows\pif\CVT32.pif
   • %Windir%\Tasks\At1.job
   • %UserProfile%\[User Name]\Templates\winword.sys
   • %UserProfile%\[User Name]\Local Settings\Application Data\[User Name].exe
   • %UserProfile%\[User Name]\Local Settings\Application Data\ntsvc.exe
   • %UserProfile%\[User Name]\Local Settings\Application Data\INDONESIA-RAYA-INDONESIA-MERDEKA-17-AGUSTUS-1945.INF
     
     Note:
   • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).
   • %UserProfile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\[CURRENT USER] (Windows NT/2000/XP).
     
     
2. Adds the value:
   
   "Vaganza-XPloit-[User Name]" = "%Windir%\java\[User Name].exe"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   so that it runs every time Windows starts.
   
   
3. Adds the value:
   
   "Local-Settings-of-[User Name]" = "%UserProfile%\[User Name]Local Settings\Application Data\[User Name].exe"
   
   to the registry subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
   
   so that it runs every time Windows starts.
   
   
4. Modifies the Internet Explorer start page:
   
   HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Search Page = "[http://]www.indonesia.go.id/[REMOVED]?Vaganza=Dirgahayu-Indonesia-17-Agustus-MERDEKA!!!"
   
   
5. Downloads an updated version of itself from following Web site and executes it:
   
   [http://]merdeka.t35.com/[REMOVED]MasterVaganza.doc
   
   
6. Adds the following text to C:\autoexec.bat:
   
   pause
   
   
7. Adds a task to scheduler. The task attempts to run the worm at 19:00 every day.
   
   
8. Attempts to modify the following registry entries to disable system tools:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions = "1"
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr = "1"
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"
   
   
9. Ends processes, some of which may be security-related, that contain any of the following text:
   
   
   • NORTON
   • AVG
   • CILLIN
   • PANDA
   • NAV
   • MCAF
   • SCAN
   • VIRUS
   • PERSKY
   • VAKSIN
   • REGISTRY
   • TASK
   • JAVA
   • CONFIGURATION
   • COMMAND
   • CMD
   • CONTROL
   • SEARCH
   • BAT
   • INI
   • SYS
     
     
10. Gathers email addresses from the Windows Address Book, Outlook, and the following registry entries:
    
    HKEY_CURRENT_USER\Software\Microsoft\internet Account Manager\Default Mail Account
    HKEY_CURRENT_USER\Software\Microsoft\internet Account Manager\Accounts\[Random Number]\SMTP Email Address
    
    
11. May send the email addresses that it gathers to the following web site:
    
    [http://]merdeka.t35.com/[REMOVED]VagMail.php
    
    
12. May also create the following files:
    
    C:\Vaganza_ox1da_Lewati_CopyMassal.txt
    C:\Vaganza_ox1da.txt
    
    
13. May copy the following files to network shares:
    
    
    • PHOTO FROM [User Name].G-F.scr
    • System.sys
      
      
14. Opens Microsoft Paint (mspaint.exe) in an attempt to hide its presence.
    
    
15. Frequently restarts the compromised computer.
    

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.