W32.Enegg@mm

SUMMARY

W32.Enegg@mm is a mass-mailing worm that attempts to delete security software and system files. The worm is written in Visual Basic and mails itself to contacts in the Microsoft Outlook Address Book, using a variety of Spanish subject lines and message bodies. The attachment will be named Cynthia.exe.

Protection

• Virus Definitions (LiveUpdate™ Weekly) July 23, 2003
• Virus Definitions (Intelligent Updater) July 21, 2003

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium
• Large Scale E-mailing: Mails itself to contacts in the Microsoft Outlook Address Book
• Deletes Files: Deletes security software.
• Compromises Security Settings: Deletion of security software opens the computer to possible attack.

Distribution

• Distribution Level: High
• Subject of Email: Varies
• Name of Attachment: Cynthia.exe
• Size of Attachment: 81,920 bytes

TECHNICAL DETAILS

When W32.Enegg@mm is executed, it performs the following actions:

1. Creates the file: %Windows System%CynthiaCynthia.txt
   
   and opens it in Notepad, displaying the following text:
   
   Cynthia siempre seras el amor de mi vida
   Nunca dejare de amarte ...Princesita
   Te amo mucho y voy a estar cerca a ti muy pronto bebe
   Bebe Como yo nadie te ah amado te amo =)
   Nunca me cansare de decirte q eres la mujer de mi vida
   te amo con todo mi corazon bebe y me gustaria q todo el
   mundo se entere de lo mucho q te amo eres mi vida y nunca
   pero nunca te dejare de amar
   Hola este virus no hace nada no te va a formatear nada ni
   nada ok? tranquilizese q no es nada malo solo
   eh creado este virus para q todo el mundo se entere de lo
   mucho q amo a cynthia la amo con todo mi corazon
   si tiene algun problema tan solo reinstale su windows pero
   le repito no es nada malo =)
   
   
2. Displays a message box with the text:
   
   Nunca me cansare de decirte q eres la mujer de mi vida
   te amo con todo mi corazon bebe y me gustaria q todo el
   mundo se entere de lo mucho q te amo eres mi vida y nunca
   pero nunca te dejare de amar
   
   
3. Copies itself to:
   • %Windows System%Cynthia.exe
   • C:RecycledCynthia.exe
     
     
4. May create the following files, which attempt to display a message box when executed, but may be corrupted:
   • cmd.exe.vbs
   • msconfig.exe.vbs
   • sysedit.exe.vbs
     
     
5. Adds the registry key: HKLMSoftwareCynthia
   
   to track whether the machine has already been infected.
   
   
6. Adds the value: "Windows" = "C:RecycledCynthia.exe"
   
   to the registry key:
   
   HKLMSoftwareMicrosoftWindowsCurrentVersionRun
   
   
7. Attempts to delete all the files in the folders:
   
   • %Program Files%AntiViral Toolkit Pro
   • %Program Files%Command SoftwareF-PROT95
   • %Program Files%McAfeeVirusScan
   • %Program Files%Norton AntiVirus
   • %Program Files%Panda SoftwarePanda Antivirus Titanium
   • %Program Files%Panda SoftwarePanda Antivirus 6.0
   • %Program Files%AnalogXScript Defender
   • %Program Files%Trend MicroPC-cillin 2000
   • %Program Files%Trend MicroPC-cillin 2002
   • %Program Files%AVPersonal
   • %Program Files%Trend PC-cillin 98
   • %Program Files%Perav
   • %Program Files%McAfeeMcAfee VirusScan
   • %Program Files%F-SecureAnti-Virus
   • %Program Files%The Hacker
   • %Program Files%one LabsoneAlarm
   • %Program Files%ESETNOD32
   • %Program Files%McAfee VirusScan Professional Edition 7.0
   • %Program Files%The Hacker 5.5
   • %Program Files%The Hacker
   • C:ToolkitFindVirus
     
     
8. Creates an email with itself attached, using contacts in the Outlook Address Book, and sends itself with the following subject lines and message bodies:
   

Subjects:
• revisalo ok
• Hackea hotmail
• Tutoriales hackers
• Hackear hotmail
• Parches para Norton 2003
• Parches de microsoft
• Parches para kaspersky AVP
• Fotos de Cynthia
• cuidado!!
• Hacker Tutoriales aplicacion
• Fwd: huevos poetas
• Fwd: Msn_Ghost
• Re: MsN 6.5 final
• Re: El archivo...
• mxpx screensaver
• messenger 6.5 v.final
• cynthia fotos
• Norton New Patches
• McAfee VirusScan Patches
• Kaspersky AVP Patches
• Hacking hotmail
• Hackers Tutorials
• nada mas!!!prueba este tutorial
• Parches para McAfee VirusScan 2003
• actualizate de una vez gogoogogogogo
• Alertas de virus!!
• Fwd: msn_ghost
• Re: mxpx_screensaver
• Re: messenger 6.5
• Cynthia_fotos
• mxpx
• screensaver
• tan solo pruebalo
• Parche
• parches
• fuerza_hotmail
• crack
• como estas... te env
• hackear_hotmail
• fotos_De_Cynthia
• Norton_parches
• msn_ghost
• internet_explorer_parche
• parche_Seguridad_explorer
  
  
Message Body:
• mira las fotos de mi flaka jeje.solo para q la conoscas esta compilado ciaoo
• ah salido un nuevo virus q tienes q tener mucho cuidado te adjunto el parche de seguridad adios
• descomprime el exe y ejecutalo en la pc para q te cuides del nuevo virus chao
• aca estan lsoparches para tu antivirus el norton 2003 bueno hablamos adios ;)
• parches para kaperskyusalos ya adios
• oye!! aca esta hackea hotmail de una vez te mando el programa chao
• manual del buen hacker para hotmail recomendado!!!
• Hola!!!, por ah dicen que hay alertas para el virus DeathLetter, as que ejecuta estos parches para que no seas infectado :)
• te mando las fotos de mi novia cynthia para q la conoscas ok? estan comprimidas adios!!
• oye ah salido un nuevo virus asi q aca te mando algo para q te cuides ok?
• Muy buen tutorial para el hack te lo recomiendo
• estos huevos poetas son un mate de risa miralos jajajajja
• conversa con gente q no tengas a agregada a tu msn con el msn_ghost
• bravazo este protector de pantalla
• mira las fotos de mi Cynthia , te las puse en un programa
• lo ultimooo el messenger 6.5 ponle sonido a tusmensajes y manda mensajes con voz olvidate de escribir chaooo
• el mejor grupo de punk MXPX te mando un programa para la pc de este grupazo de punk!!
• Nuevo Virus Alerta!!! Dicen por ahi q ah salido la variante del ultimo virus te mando el parche
• descarga el nuevo parche de Microsoft para 9x/Me/2000/NT/XP espara combatir los nuevos virus
• Descarga el nuevo parche para Norton antivirus 2003 para 9x/Me/2000/NT/XP
• TE MANDO UN PROGRAMA PARA SACAR CONTRASE AS DE HOTMAIL ATRAVEZ DE FUERZA BRUTA ES MEJOR Q EL BRUTUS HoT
• te mando el crack para el Norton Antivirus viene con la nueva herramienta llamada NORTON GHOST funciona bajo win 9x/Me/2000/NT/XP ya no tendras problemas con virus en tu maquina
• Hola aca te mando el archivo q me pedistes esta adjuntado
• o estos tutoriales para que aprendas a hackear a los que te caen mal y est n en hotmail. Diviertete!!!
• DIVIERTETE!!! te mando el programa para q puedas hablar con gente qno tengas agregada al Messenger
• OYE TEN CUIDADO A SALIDO UN VIRUS MUY PELIGROSO Q TE FORMATEA EL DISCO DURO TE MANDO ESTOS PARCHES DE SEGURIDAD DE MICROSOFT
• ve las fotos de mi novia Cynthia para q la conoscas, son solo para t!!! ;)
• hola, como estas? oyep aca te mando el programa para sacar seriales.. de varios programas y haci no tengas q pagar nada :P me lo dio un amigo
• actualizaciond e internet explorer la version 6.5.2 aca esta descargalo bye
• el programa por el que preguntaste te lo mando y actualzate saludos!! =P

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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.

REMOVAL

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 Me/XP).
2. Update the virus definitions.
3. Run a full system scan and delete all the files detected as W32.Enegg@mm.
4. Delete the value that was added to the registry.
   

For specific details on each of these steps, read the following instructions.

1. Disabling System Restore (Windows Me/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:

• "How to disable or enable Windows Me System Restore"
• "How to turn off or turn on Windows XP System Restore"

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. Updating 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. Scanning for and deleting the infected files

1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
   • For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
   • For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan all files."
2. Run a full system scan.
3. If any files are detected as infected with W32.Enegg@mm, click Delete.

4. Deleting the value from 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 and delete the following key:
   
   HKLMSoftwareCynthia
   
   
4. Navigate to the key:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
   
5. In the right pane, delete the value:
   
   "Windows" = "C:RecycledCynthia.exe"
   
   
6. Exit the Registry Editor