W32.Narcs

1. Creates a mutex named "W32.Scran-Worm", so that only one instance of the worm is running.
   
   
2. Attempts to download a file from www.freeweb.com, which is saved as c:\botnet.exe and then executed.
   
   Note: This file is detected as W32.Spybot.Worm.
   
   
3. Creates the following copies of itself:
   
   • %Program Files%\sys32i\Age of Empires crack.exe
   • %Program Files%\sys32i\Age of Empires.exe
   • %Program Files%\sys32i\CD Key.exe
   • %Program Files%\sys32i\Counter Strike 6.exe
   • %Program Files%\sys32i\Counter Strike.exe
   • %Program Files%\sys32i\Grand Theft Auto 3 CD2 ISO.exe
   • %Program Files%\sys32i\Half-Life.exe
   • %Program Files%\sys32i\Hotmail Hack.exe
   • %Program Files%\sys32i\Hotmail account cracker.exe
   • %Program Files%\sys32i\KeyGen.exe
   • %Program Files%\sys32i\Microsoft Office.exe
   • %Program Files%\sys32i\Norton Anti Virus 2004.exe
   • %Program Files%\sys32i\Norton Anti Virus 2005.exe
   • %Program Files%\sys32i\Norton Anti Virus Crack.exe
   • %Program Files%\sys32i\Norton Firewall.exe
   • %Program Files%\sys32i\Norton Internet Security 2004.exe
   • %Program Files%\sys32i\Partition Magic 8.exe
   • %Program Files%\sys32i\Playstation 2.exe
   • %Program Files%\sys32i\Resident Evil.exe
   • %Program Files%\sys32i\Scran.cpl
   • %Program Files%\sys32i\Scran.exe
   • %Program Files%\sys32i\Tomb Raider.exe
   • %Program Files%\sys32i\Trojan Remover.exe
   • %Program Files%\sys32i\Windows XP Home.exe
   • %Program Files%\sys32i\Yahoo Hack.exe
   • %Program Files%\sys32i\ZoneAlarm Firewall Pro.exe
     
     Note: %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
     
     
4. Creates and modifies %Program Files%\mIRC\script.ini, which allows the worm to propagate through IRC network.
   
   
5. Adds the value:
   
   "W32.Scran" = "%Program Files%\sys32i\Scran.exe"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   so that the worm runs when every time Windows starts.
   
   
6. Adds the value:
   
   "Dir0" = "012345:%Program Files%\sys32i"
   
   to the registry keys:
   
   HKEY_CURRENT_USER\Software\Imesh\Client\LocalContent
   HKEY_CURRENT_USER\Software\Kazaa\LocalContent
   
   so that %Program Files%\sys32i is set as the default file transfer directory for iMesh and Kazaa.
   
   
7. Adds the value:
   
   "DlDir0" = "%Program Files%\sys32i"
   
   to the registry key:
   
   HKEY_CURRENT_USER\Software\Kazaa\Transfer
   
   so that %Program Files%\sys32i is set as the default file transfer directory for Kazaa.
   
   
8. If the date is January 1st, the worm will display a message box with the following properties:
   
   Ha?
   Happy New Year W32.Scran!!

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.