W32.Antinny.Q

1. Launches Windows Media player, attempting to play a file. However, it displays an error message stating that the file cannot be executed.
   
   
2. Creates a copy of itself. The file name is derived by randomly choosing the name of a file in the Program Files folder and one of the following strings:
   
   • _cfg
   • _config
   • _start
   • _login
   • _setup
   • _env
   • _loader
   • _autorun
     
     
     The file is created within a folder under Program Files with a name based on the randomly chosen filename:
     
     Program Files\<RANDOMLY CHOSEN FILENAME>\<RANDOMLY CHOSEN FILENAME><RANDOM STRING FROM ABOVE>.exe
     
     
3. Adds the value:
   
   "<RANDOMLY CREATED FILENAME>"="<PATH TO WORM> /startup"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   so that the worm runs whenever Windows is started.
   
   
4. Adds the following to the WIN.INI file:
   
   [hoge]
   hugo=<PATH OF WINNY APPLICATION>
   
   
5. Creates a copy of itself in the Winny upload folder, selecting one of several predetermined, Japanese character strings as its filename.
   
   
6. Creates a copy of itself in the %Temp% folder, selecting one of several predetermined, Japanese character strings as its filename.
   
   

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   Note:
   • %Temp% is a variable. The worm locates the current user's temporary folder and copies itself to that location. By default, this is C:\Documents and Settings\<current user>\Local Settings\Temp in Windows NT/2000/XP.
   • This file is copied to this folder on Windows NT/2000/XP operating systems only.

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7. Attempts to randomly delete files on the root of the C: drive.
   
   
8. It creates a copy of itself, named using the following characteristics:
   
   
   1. One of the following strings:
      
      • Track
      • track
        
        
   2. Followed by a 3 digit number ranging from 000 to 016.
      
      
   3. Followed by one of the following strings:
      
      • .mpg
      • .mp3
      • .mpeg
      • .wav
        
        
   4. Followed by a long series of space characters and an .exe file extension.
      
      
      The file is created in a subdirectory within the %Temp% folder. The name of the subdirectory is made up of five random digits followed by ".tmp".
      
      For example:
      
      Documents and Settings\<USER NAME>\Local Settings\Temp\18706.tmp\track000.mpg<SPACES>.exe
      
      
      
      

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      Note: A long series of space characters in the filename is a method for obscuring the true extension of a file. If Explorer is configured to show all file extensions and details, you can easily spot the tell tale signs. Look out for the three dots on the right hand side of the Name column, this indicates that the filename extends beyond the column width. Make sure that the Type displayed matches that of the displayed file name. For example if the displayed filename is "XYZ.JPG" the corresponding entry in the Type column should be "JPEG Image" and not "Application".

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9. Attempts to access the Web site http:/ /www.accsjp.or.jp and uploads personal information, if the system date is April or later and the day matches the number of the month. For example, April 4, May 5, June 6, etc.

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.