W32.Kitro.C.Worm

W32.Kitro.C.Worm arrives by email as an attachment with the .cpl (Control Panel Applet) extension. When executed, it does the following:

It copies itself to the root of the hard drive and to the windows folder (the windows folder is usually c:\windows or c:\winnt). The file name that it uses is a random number with the .cpl extension, for example 1708.cpl.

In order to run each time the machine is rebooted, it adds a value to the key

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

The value refers to the file that it copied previously, for example

1708     rundll32.exe shell32.dll,Control_RunDLL C:\WINDOWS\1708.cpl

W32.Kitro.C.Worm collects email addresses of the user's MSN messenger contacts from the registry key

HKEY_CURRENT_USER\Software\Microsoft\MessengerService\ListCache\.NET Messenger Service

and attempts to send itself through the SMTP server mail.hotmail.com. The characteristics of the email message are described below. After successfully sending itself, W32.Kitro.C.Worm creates a copy of itself under the name zero.exe in the windows directory.

W32.Kitro.C.Worm uses temporary files named commfig.sys and k32.vxd and located in the windows directory during the manipulation of email addresses lists.

W32.Kitro.C.Worm also attempts to spread through the Kazaa peer-to-peer network. It tries to read the registry value

HKEY_CURRENT_USER\Software\Kazaa\Transfer\DlDir0

and if it can do so, it copies itself to the Kazaa share under one of the following names, thus making itself available for other Kazaa users to download.

• DivResidentEvil.ZIP.cpl
• SpidermanDesktop.cpl
• AVP_KeyActualization2002.ZIP .cpl
• Messenger_skins.ZIP .cpl
• Porno_sTar.cpl
• CannibalCorpse.MP3 .cpl
• ASickofitall.Zip .cpl
• AXEbahia.cpl
• NuevosVideosProfesorRossa.cpl
• NewVideo_Blink182.cpl
• LagWagon&Blink182.cpl
• Hacking.cpl
• AllMcAfeeCrack.Cpl
• Britney_spearsVSDavidBeckham_AnalPasions.cpl
• Crack.PerAntivirus.Zip .cpl
• JamieThomasVSrodneyMullen.cpl
• MariguanaDesktop.cpl
• AgeOfEmpires2_Crack.cpl
• PSX2_Emulation.Zip .cpl
• GameCube.Zip .cpl
• Mames.Zip.cpl
• Crack_Delphi5and6.Zip .cpl
• terminator2.cpl
• BinladenF*ckinBillGates.cpl
• AnalPasswords.cpl
• ElvisDesktop.cpl
• B.cpl
• Z.cpl
• AVP_Spanish.cpl
• ZoneAlarmCrack.cpl
• HardXCore.cpl
• PhotoShop6.xCrack.cpl
• BioHazard.cpl
• VisualBasic.Net.cpl
• Zidane.Taliban.cpl
• VideoPortoSeguro.cpl
• PSX2EmulatorFree.Zip .cpl
• sexo_en_la_calle.cpl
• sexo_anal_full_video.cpl
• sexo_oriental_full_video.cpl
• muertes_videos.cpl
• fullvideo_anal_action.zip .cpl

In order to evade detection by some antivirus products, W32.Kitro.C.Worm manipulates data files and registry information. It modifies the registry value

HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\SharedFiles\Folder

to point to the windows directory and alters the value

PAV.EXE     C:\WINDOWS
in
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

probably in an attempt to prevent an antivirus program from running on startup.

In addition it deletes the following files if they are present on the system:

C:\archiv~1\perav\pav.dll
C:\archiv~1\perav\per.dll
C:\program files\perav\pav.dll
C:\program files\perav\per.dll

and also the following files from the windows folder:

PAV.EXE
\bases\avp.set
\system\vshield.vxd
\system32\vshield.vxd
\vshield.vxd

W32.Kitro.C.Worm contains several possible email formats, using various subject lines and file attachments.

Possible Subjects lines:

• Esta si que es zorra!!!
• Fotos de asesinatos, Jack el Destripador, Charles Manson, y muchos mas para decorar tu escritorio.
• Yeahhh Mutha Facka... NY Brookling in your NET.
• Genera passwords para poder entrar a las webs mas putonas de la red, y gratis, incluso podras bajar peliculas porno.
• Para los verdaderos amigos...
• Test de amor.
• 30 pregutas para saber si tu pareja te enga
• !La imagen de cristo en un bosque.
• mira como seria un mundial en la antigua mesopotamia.
• Fotos de Cristo para decorar tu escritorio.
• Te han enviado una postal.
• Te acuerdas de mi?
• Asi se hace el amor...
• Asi me gusta a mi...
• Esto doleria mucho, mucho :-).
• Si esto no me lo regresas me sentire mal.
• La vida despues de la muerte.
• Me cambie de correo, aver si ahora me escribes...
• Leelo y reenvialo a quienes mas amas.
• Cancion de amor, para ti.
• Paulina Rubio y su zorrita cosmica...
• No todo lo que uno lea sobre el servicio de webmail de Microsoft es cierto.
• !Ver el listado de falsas alarmas.
• !ja, la han cagado con este video.
• Bin Laden DT de la seleccion de arabia...
• Bin Laden nuevo goliador de Arabia saudita , jaaaaaaa.
• Bin Laden presidente de la FIFA.
• Dime que te parece esta animacion.
• Una broma para las secretarias, ja ja.
• Test para secretarias, para saber que tan tontas son.
• 41 preguntas para saber si alguien es sicopata.
• mira esto es mas ordinario que gato con hanta, juaaaaaaaaaaaa.
• listado de ultimas mentiras que circulan por los mails.
• Last hoaxes list.
• Hola
• como te gustarian este par de tetitas.
• Leelo y reenvialo a quienes mas amas.
• mira esto es mas ordinario que gato con hanta, juaaaaaaaaaaaa.
• listado de ultimas mentiras que circulan por los mails.
• Bin Laden killing muthaFaka bill gates.
• mira como seria un mundial en la antigua mesopotamia

Possible corresponding attachments:

• zorrita.cpl
• jack.cpl
• sickofitall.cpl
• analpasswords.cpl
• poema_angelical.cpl
• testdeamor.cpl
• Adulterio_en_tus_narices.cpl
• Cristo.cpl
• mundial.cpl
• cristo2002.cpl
• postal_de_mi_alma.cpl
• estesoyyo.cpl
• milposiciones.cpl
• como_como.cpl
• por_ahi_noooooo.cpl
• lomasimportante.cpl
• vidaymuerte.cpl
• siemprevivir@setnet.cpl
• milvidas.cpl
• comoolvidarte.cpl
• paulinasex.cpl
• mentiras_en_hotmail.cpl
• listado_de_hoaxes.cpl
• zapato_en_el_culo.cpl
• binladenDT.cpl
• gooooooool.cpl
• Fifaladen.cpl
• 788782.cpl
• secretarias.cpl
• test_secretontas.cpl
• sere_yo_uno_de_esos.cpl
• scarycrai.cpl
• mentiras_mails.cpl
• mcaffehoaxlist.cpl
• tetris2002.cpl
• zandias_meloones.cpl
• quien_como_tu.cpl
• portymore.cpl
• listado_de_porquerias.cpl
• billgatesscream.cpl

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.

Summary