W32.Kibuv.Worm

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Discovered: May 14, 2004
Updated: February 13, 2007 12:23:07 PM
Also Known As: BloodHound.Packed
Type: Worm
Systems Affected: Windows
CVE References: CAN-2003-0533 CAN-2003-0352


W32.Kibuv.Worm is a worm that exploits the LSASS vulnerability (described in Microsoft Security Bulletin MS04-011 ) and the DCOM RPC vulnerability described in (Microsoft Security Bulletin MS03-026 ).

It spreads by scanning randomly selected IP addresses for vulnerable computers.

Antivirus Protection Dates

  • Initial Rapid Release version May 14, 2004
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version May 14, 2004
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date May 14, 2004

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

Writeup By: Scott Gettis

Discovered: May 14, 2004
Updated: February 13, 2007 12:23:07 PM
Also Known As: BloodHound.Packed
Type: Worm
Systems Affected: Windows
CVE References: CAN-2003-0533 CAN-2003-0352


When W32.Kibuv.Worm is executed, it does the following:

  1. Checks to see whether a computer is already infected and the worm is running. If so, the worm will not infect the computer a second time.

  2. Adds the value:

    "Vote For Kerry" = "KillBush.exe"

    to the registry keys:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

      so that the worm runs when you start Windows.


      Note: The file name of the executable may vary.

  3. Starts an FTP server on TCP port 9604. This server is used to spread the worm to other hosts.

  4. Starts another thread that will listen on TCP port 420. This thread contains code to:
    • Send itself to a remote computer as KillBush.exe and then execute the file.
    • Download files and execute them. The files have with random, six-character names, with an .exe extension.

  5. Generates random IP addresses.

  6. Attempts to infect the computer at the random IP address by exploiting the DCOM RPC vulnerability on TCP port 135. If successful, it will do the following:
    1. Create a hidden remote shell process that will listen on a random TCP port. (This will allow an attacker to issue remote commands on an infected computer.)
    2. Use the shell on the remote computer to reconnect to the infected computer's FTP server.
    3. Retrieve a copy of the worm and then execute it.

  7. Attempts to infect the computer at the random IP address using the LSASS vulnerability. If a connection is made to a remote computer, the worm will:
    1. Send shell code to the remote computer, which may cause it to open a remote shell on TCP port 5300.
    2. Use the shell on the remote computer to reconnect to the infected computer's FTP server.
    3. Retrieve a copy of the worm and then execute it.


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.

Writeup By: Scott Gettis

Discovered: May 14, 2004
Updated: February 13, 2007 12:23:07 PM
Also Known As: BloodHound.Packed
Type: Worm
Systems Affected: Windows
CVE References: CAN-2003-0533 CAN-2003-0352


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Disable System Restore (Windows XP).
  2. Update the virus definitions.
  3. Restart the computer in Safe mode or VGA mode.
  4. Run a full system scan and delete all the files detected as W32.Kibuv.Worm.
  5. Reverse the changes that the worm made to the registry.
For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected Files in the _Restore Folder ," Article ID: Q263455.

2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

3. To restart the computer in Safe mode or VGA mode
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
  • For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
  • For Windows NT 4 users, restart the computer in VGA mode.
4. To scan for and delete the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.Kibuv.Worm, click Delete.

5. To reverse the changes made to the registry


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

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the keys:
    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\SYSTEM\Microsoft\Windows\CurrentVersion\RunServices
  4. In the right pane, delete the value:

    "Vote For Kerry" = "KillBush.exe"

  5. Exit the Registry Editor.


Writeup By: Scott Gettis