Discovered: April 5, 2005
Updated: February 13, 2007 12:36:28 PM
Type: Trojan Horse
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
When the Trojan is executed, it performs the following actions:
- Creates the following file:
%System%\smp.dll
Note: %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
- Adds the value:
"(Default)" = "%System%\smp.dll"
to the registry subkey:
HKEY_CURRENT_USER\SOFTWARE\Classes\CLSID\{0211C4D9-BC71-8916-38AD-9DEA5D213614}\InProcServer32
so that Trojan.Spbot is loaded into Windows Explorer every time Windows starts.
- Adds the value:
"{0211C4D9-BC71-8916-38AD-9DEA5D213614}" = "OLE Module"
to the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler
so that Trojan.Spbot is loaded into Windows Explorer every time Windows starts.
- Modifies the value:
"DoNotAllowXPSP2" = "1"
in the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
to lower security settings.
- Modifies the values:
"AntiVirusDisableNotify" = "1"
"FirewallDisableNotify" = "1"
"AntiVirusOverride" = "1"
"FirewallOverride" = "1"
"UpdatesDisableNotify" = "1"
in the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
to lower security settings.
- Modifies the value:
"AUOptions" = "1"
in the registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update
to lower security settings.
- Modifies the value:
"EnableFirewall" = "0x0"
in the registry subkeys:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile
to disable the Microsoft firewall.
- Modifies the value:
"Start" = "4"
in the registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
to disable the Microsoft Security Center.
- Modifies the values:
"1001" = "1"
"1004" = "1"
"1200" = "0"
"1809" = "3"
in the registry subkeys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones
to lower security settings.
- Sends notifications of its status via the following URLs:
- rsp.btthost.com/alive.php
- rsp.btthost.com/inst.php
- rsp.btthost.com/report.php
- rsp.btthost.com/num.php
- rsp.btthost.com/resend.php
- rsp.btthost.com/task.php
- Opens a back door on UDP port 256.
- Works as an email relay for SPAM.
- Uses a randomly created sender address from one of the following domains:
- @yyhmail.com
- @wongfaye.com
- @wartaponsel.com
- @ultrapostman.com
- @u2club.com
- @tlcfan.com
- @tenchiclub.com
- @surfy.net
- @southparkmail.com
- @shaniastuff.com
- @sammimail.com
- @roxette.org
- @rickymail.com
- @ranmamail.com
- @qdice.com
- @purinmail.com
- @otakumail.com
- @norikomail.com
- @nctta.org
- @myfunnymail.com
- @malaysia.net
- @lovecat.com
- @lopezclub.com
- @lissamail.com
- @leonlai.net
- @kichimail.com
- @kellychen.com
- @jpopmail.com
- @hingismartina.net
- @grungecafe.com
- @fffan.com
- @dogmail.org
- @chocofan.com
- @celineclub.com
- @britneyclub.com
- @boyzoneclub.com
- @badtzmail.com
- @backstreetboysclub.com
- @amuromail.com
- @amuro.net
- @amrer.net
- @allsaintsfan.com
- @aaronkwok.net
- @168city.com
- @zipolite.com
- @zapopan.com
- @veracruz-llave.com
- @ustedopina.com
- @universo.com
- @tuxtla.com
- @tlaxcala.com
- @tepasasdeveras.com
- @tegucigalpa.com
- @tamaulipas.com
- @surrealismo.com
- @surfeador.com
- @supersonicos.com
- @superdirectorio.com
- @sexxxo.com
- @sanluis.com
- @saladeprensa.com
- @rotario.com
- @regiomontano.com
- @rdominicana.com
- @radiomexico.com
- @radioactivo.com
- @quintanaroo.com
- @queretaro.com
- @puertorrico.com
- @puebla.com
- @programador.com
- @postaldigital.com
- @pormexico.com
- @picanteperosabroso.com
- @osopanda.com
- @ondagrupera.com
- @oficinadecorreo.com
- @nuevoleon.com
- @notimexico.com
- @nayarit.com
- @mundoanimal.com
- @morelos.com
- @michoacan.com
- @mexxxico.com
- @mejico.com
- @m3xico.com
- @lujuria.com
- @lapalabra.com
- @jerusalen.com
- @islasmarias.com
- @infantil.com
- @ilusionista.com
- @horafeliz.com
- @guanajuato.com
- @guadalupano.com
- @grandesligas.com
- @gobiernofederal.com
- @garzagarcia.com
- @futbolsoccer.com
- @futbolamericano.com
- @fumador.com
- @filantropia.com
- @fiestabrava.com
- @femenino.com
- @exalumnos.com
- @esoterico.com
- @elturista.com
- @elchavo.com
- @ejecutivo.com
- @edomex.com
- @derechoshumanos.com
- @deportista.com
- @depelicula.com
- @cuernavaca.com
- @costarrica.com
- @correo1.com
- @comidamexicana.com
- @colima.com
- @coahuila.com
- @cinemexicano.com
- @cienciaficcion.com
- @chihuahua.com
- @chido.com
- @cartonista.com
- @capitalino.com
- @busquedas.com
- @buenhumor.com
- @billonario.com
- @belice.com
- @barriolatino.com
- @bajacalifornianorte.com
- @asistencia.org
- @artesmarciales.com
- @ardiente.com
- @anuncia.com
- @antronomia.com
- @altacocina.com
- @alcoholicosanonimos.com
- @albur.com
- @alacarta.com
- @aguascalientes.com
- @acuario.com
- @juno.com
- @pacific.net.hk
- @worldnet.att.net
- @mcimail.com
- @263.net
- @163.net
- @libero.it
- @hot.ee
- @gmx.de
- @geocities.com
- @gateway.net
- @ns.sympatico.ca
- @mindspring.com
- @atlanta.com
- @cs.com
- @erols.com
- @webtv.net
- @t-online.de
- @pacbell.net
- @earthlink.net
- @usa.net
- @server.com
- @server.n@arkansas.net
- @softhome.net
- @zzn.com
- @home.com
- @compuserve.com
- Uses an X-Mailer randomly choosen from the following:
- Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.0.0) Gecko/20020623 Debian/1.0.0-0.woody.1
- Mutt/1.5.1i
- Sylpheed version 0.8.2 (GTK+ 1.2.10; i586-alt-linux)
- Pegasus Mail for Win32 (v2.53/R1)
- SmartMailer Version 1.56 -German Privat License-
- MIME-tools 4.104 (Entity 4.116)
- Calypso Version 3.20.01.01 (4)
- Mozilla 4.61 [en]C-CCK-MCD C-UDP; (Win98; I)
- QUALCOMM Windows Eudora Pro Version 4.0
- The Bat! (v1.51) Educational
- AOL 6.0 for Windows US sub 10551
- AOL 7.0 for Windows UK sub 52
- The Bat! (v1.53d)
- Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0rc2) Gecko/20020513 Netscape/7.0b1
- MailGate v3.0
- The Bat! (v1.60q)
- Microsoft Internet Mail 4.70.1155
- Mozilla 4.7 [en] (X11; I; FreeBSD 4.0-20000103-CURRENT i386)
- Microsoft Outlook Express 4.72.3110.5
- The Bat! (v1.61)
- Calypso Version 3.30.00.00
- PObox II beta1.0
- AOL 7.0 for Windows US sub 118
- eGroups Message Poster
- Microsoft Outlook Express 5.50.4133.2400
- Microsoft Outlook Express 5.00.2919.6700
- Internet Mail Service (5.5.2650.21)
- QUALCOMM Windows Eudora Version 5.1
- Microsoft Outlook, Build 10.0.2627
- Microsoft Outlook, Build 10.0.2616
- Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0)
- Microsoft Outlook Express 6.00.2462.0000
- MIME-tools 5.503 (Entity 5.501)
- Microsoft Outlook Express 5.00.2615.200
- Microsoft Outlook Express 6.00.2600.0000
- The Bat! (v1.52f) Business
- Microsoft Outlook Express 5.50.4522.1200
- Creates the following files from data downloaded from rsp.btthost.com domain:
- %temp%\url.sys
- %temp%\mailz.dat
- %temp%\tsk.sys
- %temp%\body.dat
Note: %Temp% is a variable that refers to the Windows temporary folder. By default, this is C:\Windows\TEMP (Windows 95/98/Me/XP) or C:\WINNT\Temp (Windows NT/2000).
- Uses those files to send spam e-mail then deletes the files.
- Attempts to download an additional file from rsp.btthost.com domain to %temp%\file.exe and runs 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: Ka Chun Leung
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