http://upx.sourceforge.net

Usando su propio SMTP (Simple Mail Transfer Protocol) se auto-envía a las direcciones de correo contenidas en la Libreta de Direcciones de Windows (WAB) o de archivos con las siguientes extensiones:

• TBB
• tbb
• TBI
• tbi
• DBX
• dbx
• HTM
• htm
• TXT
• txt

Remitente, cualquiera de los extraídos en el sistema infectado.

Asunto, aleatoriamente uno de los siguientes:

• ASAP
• please responce
• Read this
• urgent
• toxic
• contract
• Money
• office
• Have a nice day
• Hello
• Russian's
• Amirecans
• attachments
• attach
• waiting
• best regards
• Administrator
• Warning
• text
• Vasia
• re: Andrey
• re: please
• re: order
• Allert!
• Att

Contenido, uno de los siguientes:

• Hi
  Did you get the previous document I attached for you?
  I resent it in this email just in case, because I
  really need you to check it out asap.
  Best Regards
  
• Hi
  I made a mistake and forgot to click attach
  on the previous email I sent you. Please give me
  your opinion on this opportunity when you get a chance.
  Best Regards
  
• Hi
  I was supposed to send you this document yesterday.
  Sorry for the delay, please forward this to your family if possible.
  It contains important info for both of you.
  
• Hi
  Sorry, I forgot to send an important
  document to you in that last email. I had an important phone call.
  Please checkout attached doc file when you have a moment.
  Best Regards
  
• Hi
  I was in a rush and I forgot to attach an important
  document. Please see attached doc file.
  Best Regards,
  
• Sorry to bother you, but I am having a problem receiving your emails.
  I am responding to your last email in the attached file.
  Please get back to me if there is any problem reading the attachment.
  
• I am responding to your last email in the attached file.
  I had a delivery problem with your inbox, so maybe you'll receive this
  now.
  
• Can you please check out the email I have attached?
  For some reason, I received only part of your last several emails.
  I want to make sure that there are no problems with either of our
  accounts.
  
• This email is being sent as attachment because
  it was previously blocked by your email filters.
  Please view the attachment and respond.
  Thanks
  
• I resent this email as attachment because
  it was previously blocked by your email filters.
  Please read the attachment and respond.
  Thanks
  
• I apologize, but I need you to verify
  that I have the correct contact info for you.
  My system crashed last weekend and
  I lost most of my friends and work contacts.
  Please check the attached (.pdf) and
  please let me know if your info is current.
  
• My last email to you was returned.
  The reason is that I am not currently
  added to your "allowed" contact list.
  Please add my updated contact info
  provided in the attached (.pdf) file
  so I can send you emails in the future.
  Sincerely
  
• I have updated my email address
  See the (.pdf) file attached and
  please respond if you have any questions.
  
• We have made recent updates to our database.
  Please verify your mailing address on file is correct.
  We have attached a (.pdf) sheet for you to use for your response.
  
• Hello
  Our contact information has changed.
  See the attached (.pdf) sheet for details.
  Sincerely,
  
• ***URGENT: SERVICE SHUTDOWN NOTICE***
  Due to your failure to comply with our email
  Rules and Regulations, your email account has been
  temporarily suspended for 24 hours unless we are contacted regarding
  this situation.
  You must read the attached document for further
  instructions. Failure to comply will result in termination of your
  account.
  Regards,
  Net Operator
  ***URGENT: SERVICE SHUTDOWN NOTICE***
  
• ***ATTENTION: YOUR EMAIL IS NOT BEING DELIVERED!***
  You are currently unable to send emails.
  This may be a billing issue.
  Please call the billing center.
  The # for the billing office is located in the attached
  contact list for your convenience.
  ***ATTENTION: YOUR EMAIL IS NOT BEING DELIVERED!***
  
• ***YOUR MESSAGE HAS BEEN RECOGNIZED AS SPAM***
  Hello,
  The previous email you sent has been recognized as spam.
  This means your email was not delivered to your friend or client.
  You must open the attached file to receive more information.
  ***YOUR MESSAGE HAS BEEN RECOGNIZED AS SPAM***
  
• Hello,
  What version of windows you are using?
  This last document I received from you came out weird.
  Please see the attached word file and resend the file to me.
  Many thanks,
  User
  
• Hello,
  My PC crashed while I was sending that last email.
  I have re-attached the document of yours that I discovered.
  Please read attached document and respond ASAP.
  Sincerely,
  User
  
• Hello,
  Your email was sent in an INVALID format.
  To verify this email was sent from you,
  simply open the attached email (.eml) file
  and click yes in the sender options box.
  Thank You,
  User
  
• Hello,
  Your email was received.
  YOUR REPLY IS URGENT!
  Please view the attached text file for instructions.
  Regards,
  User
  
• Hello,
  I was in a hurry and I forgot to attach an important
  document. Please see attached.
  Best Regards,
  User
  
• Hello,
  I resent this email as attachment because
  it was previously blocked by your email filters.
  Please read the attachment and respond.
  Thanks,User
  
• Hello,
  Sorry, I forgot to attach the new contact information.
  Please view the attached (.pdf) contact sheet.
  Sincerely,
  User

Anexado, uno de los siguientes con extensión EXE:

• backup.doc [espacios_en-blanco] .exe
• admin.doc [espacios_en-blanco] .exe
• archivator.doc [espacios_en-blanco] .exe
• about.doc [espacios_en-blanco] .exe
• readme.doc [espacios_en-blanco] .exe
• help.doc [espacios_en-blanco] .exe
• photos.doc [espacios_en-blanco] .exe
• payment.doc [espacios_en-blanco] .exe
• archives.doc [espacios_en-blanco] .exe
• manual.doc [espacios_en-blanco] .exe
• inbox.doc [espacios_en-blanco] .exe
• outbox.doc [espacios_en-blanco] .exe
• save.doc [espacios_en-blanco] .exe
• rar.doc [espacios_en-blanco] .exe
• zip.doc [espacios_en-blanco] .exe
• ataches.doc [espacios_en-blanco] .exe
• documentation.doc [espacios_en-blanco] .exe
• docs.doc [espacios_en-blanco] .exe
• sysboot.doc [espacios_en-blanco] .exe

o con extensión .ZIP:

• backup.zip
• admin.zip
• archivator.zip
• about.zip
• readme.zip
• help.zip
• photos.zip
• payment.zip
• archives.zip
• manual.zip
• inbox.zip
• docs.zip
• outbox.zip
• save.zip
• rar.zip
• zip.zip
• ataches.zip
• documentation.zip

Al activarse el gusano se copia a la carpeta %System% con el nombre del archivo anexado recibido y para ejecutarse la próxima vez que se inicie el sistema genera la siguiente llave de registro:

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
"default" = "%System%\[nombre_de_archivo_anexado]" 

%System% es la variable C:\Windows\System para Windows 95/98/Me, C:\Winnt\System32 para Windows NT/2000 y C:\Windows\System32 para Windows XP y Windows Server 20003.

Al siguiente re-inicio libera los siguientes archivos:

%System%\rpc32.exe 
%System%\run32.exe  
%System%\sysboot.doc [espacios_en_blanco] .EXE 

El archivo rpc32.exe es instalado como un servicio con las propiedades:

Nombre: Network Explorer
Ruta de imagen: %System%\rpc32.exe
Descripción: se ejecuta y configura herramientas de acceso desde una ventana. 

Luego borra los procesos y claves de registro de los siguientes archivos: