W32.HLLW.Lama

When W32.HLLW.Lama is executed, it does the following,

It copies itself to many locations. Here are some examples,

• C:\%windir%\Alma.exe
• C:\Test Sexi.exe
• C:\Norton Antivirus Gold Edition 2002.exe
• C:\Parche.exe
• C:\Trampa Do Brasil.exe
• C:\Cplremove.exe

NOTE: %windir% is a variable. The worm locates the \Windows folder (by default this is C:\Windows C:\Winnt) and copies itself to that location.

It may also delete the following files:

• C:\Archiv~1\Perav\Pav.Dll
• C:\Program Files\Perav\Per.Dll
• C:\Bases\Avp.Set
• C:\System32\Vshield.Vxd
• C:\Archivos De Programas\Norton Antivirus\Navdx.exe

It creates one of the following Visual Basic Script (VBS) files:

• C:\Mi Alma Al Aire.vbs
• C:\ErGrone.vbs

NOTE: Symantec antivirus products detect these .vbs files as Bloodhound.VBS.Worm.

The worm may display the following messages:





The created .vbs files use Microsoft Outlook to email the worm to all contacts in Outlook address book. The email has the following characteristics:

Subject: Limpia Tu Alma!
Message:
Hola! Limpia Tu Alma Con Este Nuevo Programa!
****** Limpia Tu Alma Con: Alma Star jajaja a mi si me funsiono pruebalo tu!!
Attachment: Alma.exe

Subject: Un Test Muy Sexi!!
Message:
Prueba Este Test Sexi jajajaja
Cuidado Y Te Exitas
Attachment: Test Sexi.exe

Subject: Yo Te Amo Pero...
Message:
Yo Te Amo Pero Yu No Me Comprendes!!
Mi Amor Por Ti Es Icreible Pero Tu No Lo Ves...(Mira El Archivo Y Te Daras Cuenta)
Attachment: Lo Que Siento.exe

Subject: Shakira Y Cristina Aguilera Desnudas!!
Message:
Hola, jejejjeje Mira Este Programita
jajjaja Ta Bien Bueno ;)
Attachment: Porn Stars.exe

Subject: Nuevo Antivirus!
Message:Hola Al Fin Y Consigo Un Buen Antivirus Aqui Te lo paso!
Attachment: Norton Antivirus Gold Edition 2002.exe

Subject: Alerta!!
Message:
A Qui Te Mando Un Parche De Windows Para Internet Explorer, El Parche Es Para El IFrame En Este Sitio Encontraras Mas Informasion
http:/ /msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/objects/IFRAME.asp
Attachment: Parche.exe

Subject: !!Kamasutra El Arte Del Sexo!! ;)
Message: jejejeje Mira Este Chiquito Pero Efectivo Manual Sobre Como Hacer El AMor ;)
Attachment: Kamasutra.exe

Subject: Borracho!! jajaja
Message: Mira Como Se Siente Estar Borracho jajajja, Es Verdadero :)
Attachment: Cerveza.exe

Subject: SeX Player 2
Message: Este Es EL Mejor Programa Del mundo Puras Putas Y Putos Y Hacen Lo Que Les Digas!
Attachment: Sex Player 2.exe

Subject: COMO ES UNA PUTA :)
Message: jejejeje Mira Como Se Siente Ser Puta! ;)
Attachment: Soy Puta.exe

Subject: El Culito...
Message: jajaja Mira El Culito De Mi Prima Y Dime Que Te Parese!! ;) www.megaculos.com
Attachment: Culo.exe

Subject: Msturbate!
Message: Este Es El Mejor Programa Para Masturbarte ;)
Attachment: Masturbate.exe

Subject: Mi Mejor Follada!
Message: Haller Tuve Mi Mejor Follada Y La E Grabado En Un Programa Mirala Y Dime Si Te Gusta ;)
Attachment: Mi Follada.exe

Subject: Miss Universo 2002 Desnuda!!
Message: Con Este Programa Puedes Ver A Miss Universo 2002 Desnuda totalmente!!
Attachment: Miss Universe Nude.exe

Subject: Brasil Iso Trampa En El Mundial!!
Message: Con Este Programa Podras Ver Como Brasil Iso Trampa En El Mundial Korea Japan 2002!
Attachment: TRAMPA DO BRASIL.exe

Subject: Cura Para Dadinu El Virus CPL!
Message: Hola Aqui Te Mando La Cura Para Dadinu El Virus CPL!
Attachment: CPLREMOVE.exe

The worm adds the value

ErGrone_sent yea

to the registry key

HKEY_CORRENT_USER\Software

This is used as a marker so that the worm does not email itself again.

So that it runs when you start Windows, the worm may add a value

Alma C:\%windir%\Alma.exe

to the registry key,

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

It also creates the file C:\Alma Destructora.bat that contains this text:

@cls
@Format C:\autotest
@Format A:\autotest

The worm attempts to copy itself to the folder C:\Program Files\KaZaA\My Shared Folder. Here are some samples of the file names that are used by the worm:

• Norton Antivirus 2002.exe
• Hotmail Crack Tools.exe
• Madonna All Videos.exe
• Fifa World Cup Kora Japan 2002.exe
• Gamecube All Tricks.exe
• The Sexy Nigths Show.exe
• C:\Osama Bin Ladem Game.exe
• Kaspersky Lab.exe
• Playstation 2 All Tricks.exe

Other KaZaA users may then download the worm from this KaZaA shared folder.

The worm also can send itself through mIRC.

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