VBS/Small.Sasan.A - VBS script virus

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Resumen

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Estadísticas

Nombre:	VBS/Small.Sasan.A
Descubierto:	08/11/2007
Tipo:	Gusano
En circulación (ITW):	No
Número de infecciones comunicadas:	Bajo
Potencial de propagación:	Medio-bajo
Potencial dañino:	Medio-bajo
Fichero estático:	Sí
Tamaño:	10.164 Bytes
Suma de control MD5:	efe528483fd3c6ed75a8c1e016026e10
Versión del VDF:	7.00.00.185
Versión del IVDF:	7.00.00.192 - Thu, 08 Nov 2007 22:23 (GMT+1)

General Método de propagación:
   • Unidades de red mapeadas

Alias:
   • Sophos: VBS/Sasan-Fam
   • Grisoft: VBS/LoveLetter

Plataformas / Sistemas operativos:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Efectos secundarios:
   • Desactiva los programas de seguridad
   • Suelta un fichero
   • Modificaciones en el registro

Inmediatamente después de ejecutarse, inicia una aplicación de Windows que muestra la siguiente ventana:

   Merlin: Huh..Banjarbaru makin panas aja ya
   Merlin: It's now time to work. Jangan ngerumpi mulu..
   Merlin: Hope you enjoy today.
   Merlin: Komputernya ta dinginin dulu OK
   Merlin: Cape dech, Bye Bye Ahh!

Ficheros Se copia a sí mismo en las siguientes ubicaciones:
   • %sysdir%\ctfmon.exe.vbe
   • \Thumbs.db.vbe
   • \%fichero detectado%.vbe

El directorio siguiente es buscado:
   • \

Se presta atención a los siguientes tipos de fichero:
   • .doc
   • .docx
   • .xls
   • .ppt
   • .jpg
   • .bmp
   • .3gp
   • .rm

El fichero original se borra después.

Crea el siguiente fichero:

– \autorun.inf Este es un fichero de texto que no presenta riesgo alguno e incluye el siguiente contenido:
   • [autorun]
     shellexecute=wscript.exe Thumbs.db.vbe

Intenta ejecutar el siguiente fichero:

– Ejecuta uno de los ficheros siguientes:
   • %sysdir%\cmd.exe
Ejecuta el fichero con los parámetros siguientes: shutdown -s -t 00 -f -m

Registro Añade la siguiente clave del registro para ejecutar el proceso al iniciar el sistema:

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   • CTFMon="%sysdir%\ctfmon.exe.vbe"

Añade las siguientes claves al registro:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   Advanced]
   • Hidden=dword:00000002

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\cmd.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\install.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\msconfig.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\regedit.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\AVG Free.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\regedt32.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\RegistryEditor.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\setup.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\setup32.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\AVG 7.5.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\rstrui.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\PCMAV.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\PCMAV-CLN.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\PCMAV-RTP.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\ANSAV.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\AVG.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\run.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avgw.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\AVG Free Edition.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\AVG Free Edition Test Centre.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Avg Free Control Center.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\vbren.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Kaspersky.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Kaspersky 6.0.2.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\PC Tools.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\AVAST.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\CAV.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\McAfee.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\McAfee VirusScan.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Symantec.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Norman.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\TuneUp Utilities.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\TuneUp Utilities 2006.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\TuneUp Utilities 2007.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Stars TuneUp Utilities.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Fix the BRONTOK.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\NOD32.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\HijackThis.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\hijack.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\navw32.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\griso.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\procexp.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avp.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\samdAV 3.3.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\samdAV 3.2.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\smadAV.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\
   Avira Antivir PersonalEdition Classic.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avcenter.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\AntiVir.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Avira.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\procmon.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\filemon.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\DiskCleaner.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\RegistryCleaner.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\StarUpManager.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\TuneUp RescueCenter.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\RescueCenter.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\TuneUp RegistryEditor.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avgcc.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\VPTray.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\VPDN_LU.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\VPC32.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\TweakUI for Windows XP.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\TweakUI.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\MSConfig CleanUp.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\CCleaner.exe]
   • Debugger="notepad.exe"

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\Itegrator.exe]
   • Debugger="notepad.exe"

Modifica las siguientes claves del registro:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   Nuevo valor:
   • NoDriveTypeAutoRun=dword:00000000
   • NoFind=dword:00000001
   • NoFolderOptions=dword:00000001
   • NoRun=dword:00000001
   • NoViewContextMenu=dword:00000001

– [HKCR\VBEFile\DefaultIcon]
   Nuevo valor:
   • (Default)=shell32.dll,-50

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   Valor anterior:
   • Hidden= %configuración definida por el usuario%
     HideFileExt= %configuración definida por el usuario%
     SuperHidden= %configuración definida por el usuario%
   Nuevo valor:
   • Hidden=dword:00000000
     HideFileExt=dword:00000001
     SuperHidden=dword:00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   Valor anterior:
   • DisableRegistryTools= %configuración definida por el usuario%
     DisableTaskMgr= %configuración definida por el usuario%
   Nuevo valor:
   • DisableRegistryTools=dword:00000001
     DisableTaskMgr=dword:00000001

Datos del fichero Lenguaje de programación:
El programa de malware ha sido escrito en Visual Basic.

Programa de compresión de ejecutables:
Para agravar la detección y reducir el tamaño del fichero, emplea un programa de compresión de ejecutables.

Para una breve descripción vea el resumen aquí.

Descripción insertada por Monica Ghitun el Fri, 09 Nov 2007 13:29 (GMT+1)
Descripción actualizada por Monica Ghitun el Fri, 09 Nov 2007 16:03 (GMT+1)

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