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Discovered: July 10, 2002
Updated: February 13, 2007 11:54:15 AM
Also Known As: W32.Kitty.Worm
Type: Worm
Systems Affected: Windows

W32.Supova.Worm comes disguised as a popular software file. It spreads across KaZaA file-sharing networks by tricking KaZaA users into downloading and running the program.

NOTE: Definitions prior to June 12, 2002 will detect this threat as W32.Kitty.Worm

Antivirus Protection Dates

  • Initial Rapid Release version July 11, 2002
  • Latest Rapid Release version November 12, 2017 revision 052
  • Initial Daily Certified version July 11, 2002
  • Latest Daily Certified version November 13, 2017 revision 038
  • Initial Weekly Certified release date July 17, 2002

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Gor Nazaryan

Discovered: July 10, 2002
Updated: February 13, 2007 11:54:15 AM
Also Known As: W32.Kitty.Worm
Type: Worm
Systems Affected: Windows

When this worm runs, it does the following:

It copies itself to the C:\Windows\Media folder as the following files:

  • Britney spears nude.exe
  • Quake 4 BETA.exe
  • Windows XP key generator.exe
  • Windows XP serial generator.exe
  • Xbox.info.exe
  • DivX.exe
  • GTA3 crack.exe
  • Battle.net key generator (WORKS!!).exe
  • Warcraft 3 battle.net serial generator.exe
  • Half-life WON key generator.exe
  • Star wars episode 2 downloader.exe
  • Winzip 8.0 + serial.exe
  • Winrar + crack.exe
  • Key generator for all windows XP versions.exe
  • Warcraft 3 ONLINE key generator.exe
  • Half-life ONLINE key generator.exe
  • Grand theft auto 3 CD1 crack.exe
  • Macromedia key generator (all products).exe
  • KaZaA media desktop v2.0 UNOFFICIAL.exe
  • Microsoft key generator, works for ALL microsoft products!!.exe
  • Microsoft Windows XP crack pack.exe
  • Hack into any computer!!.exe
  • DivX codec v6.0.exe
  • DivX newest version.exe
  • DivX pro key generator.exe
  • Key generator for over 1,000 applications (really!).exe
  • DivX patch - Increases quality.exe
  • KaZaA spyware remover.exe
  • Age of empires 2 crack.exe
  • Norton antivirus 2002.exe
  • Macromedia dreamweaver MX (crack).exe
  • Microsoft Office XP (english) key generator.exe
  • Microsoft Office XP.iso.exe
  • CloneCD + crack.exe
  • CloneCD all-versions key generator.exe
  • XBOX emulator (WORKS!!).exe
  • Gamecube Emulator (WORKS!!).exe

The worm changes the KaZaA download folder settings so that the media folder is accessible to other KazaA network users. This allows other KaZaA users to download files from that location.

NOTE: For W32.Supova.Worm to spread, the KaZaA program must be installed on the computer.

The worm also copies itself into the \Windows folder using different names that it chooses randomly from the following list:
  • Alles-ist-vorbei.exe
  • Desktop-shooting.exe
  • Hello-Kitty.exe
  • BigMac.exe
  • Hellokitty.exe
  • Cheese-Burger.exe
  • .exe

Here are some text messages that the worm might send:
  • Hehe, check this out :-)
  • Funny, check it out (h)
  • LOL!! See this :D
  • LOL!! Check this out :)

The worm then displays this fake error message:

Application attempted to read memory at 0xFFFFFFFFh
Terminating application

The worm appears to be designed to add the value

Supernova  C:\Windows\<random name from the list>.exe

to the registry key


However, Symantec Security Response has been unable to reproduce this action under laboratory conditions.

NOTE: This worm sometimes crashes when it runs.


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: Gor Nazaryan

Discovered: July 10, 2002
Updated: February 13, 2007 11:54:15 AM
Also Known As: W32.Kitty.Worm
Type: Worm
Systems Affected: Windows

NOTE: These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Update the virus definitions, and then restart the computer in Safe mode. Run a full system scan, and delete all files that are detected as W32.Supova.Worm.
  2. If it exists, delete the value


    from the registry key

For details on how to do this, read the following instructions.

To scan for and delete the infected files:
  1. Obtain the most recent virus definitions. There are two ways to do this:
    • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
    • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.

      Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.
  2. Restart the computer in Safe mode. All Windows 32-bit operating systems except Windows NT can be restarted in Safe mode. For instructions on how to do this, read the document How to start the computer in Safe Mode.
  3. Start your Symantec antivirus software and make sure that it is configured to scan all files.
  4. Run a full system scan. If any files are detected as infected by W32.Supova.Worm, click Delete.

To remove the value from the registry:

CAUTION : Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to make a backup of the Windows registry for instructions.
  1. Click Start, and click Run. The Run dialog box appears.
  2. Type regedit and then click OK. The Registry Editor opens.
  3. Navigate to the following key:

  4. In the right pane, delete the following value:

  5. Click Registry, and click Exit.

Writeup By: Gor Nazaryan