Análisis realizado por : Oscar Celestino Angelo Abendan ll   
 Alias

Delf, Emerleox, Logsnif, Graybird, Pcclient

 Plataforma:

Windows 2000, Windows XP, Windows Server 2003

 Riesgo general:
 Potencial de destrucción:
 Potencial de distribución:
 Infección divulgada:
Bajo
Medio
High
Crítico

  • Tipo de malware
    Backdoor

  • Destructivo?
    No

  • Cifrado
     

  • In the Wild:
    Sí

  Resumen y descripción

Canal de infección Descargado de Internet, Eliminado por otro tipo de malware


  Detalles técnicos

Residente en memoria Sí
Carga útil Connects to URLs/IPs

Instalación

Infiltra los archivos siguientes:

  • %System%\IEXPL0RER.bat
  • %System%\pchsvc.dll
  • %System%\Sysclt.dll
  • %System%\Systen.dll
  • %Windows%\{random}.dat
  • %Windows%\{random}.dll

(Nota: %System% es la carpeta del sistema de Windows, que en el caso de Windows 98 y ME suele estar en C:\Windows\System, en el caso de Windows NT y 2000 en C:\WINNT\System32 y en el caso de Windows XP y Server 2003 en C:\Windows\System32).

. %Windows% es la carpeta de Windows, que suele estar en C:\Windows o C:\WINNT).

)

Crea las siguientes copias de sí mismo en el sistema afectado:

  • %System%\pchsvc.dll
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Stemp.exe
  • %System%\IEXPL0RER.EXE
  • %Windows%\Hacker.com.cn.ini

Otras modificaciones del sistema

Agrega las siguientes entradas de registro:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\BITS
Asynchronous = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\BITS
Impersonate = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\BITS
DllName = "%System%\Systen.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\BITS
Startup = "ServiceMain"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\winlogon.exe = "%System%\winlogon.exe:*:Enabled:Thunder"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
Asynchronous = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
Impersonate = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
DllName = "%System%\Sysclt.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
Startup = "ServiceMain"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension
ImagePath = ""%System%\IEXPL0RER.EXE " /service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension
Type = "110"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension
DisplayName = "NTDISK Instrumentation Driver Extensions"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension
Description = "BlackHole Remote Control Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Oogical Kisk Manager Administrative Service
ImagePath = "%Program Files%\Common Files\Microsoft Shared\MSInfo\Stemp.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Oogical Kisk Manager Administrative Service
Type = "110"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Oogical Kisk Manager Administrative Service
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Oogical Kisk Manager Administrative Service
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Oogical Kisk Manager Administrative Service
DisplayName = "Oogical Kisk Manager Administrative Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Oogical Kisk Manager Administrative Service
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows XP Vista
ImagePath = "%Windows%\Hacker.com.cn.ini"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows XP Vista
Type = "110"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows XP Vista
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows XP Vista
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows XP Vista
DisplayName = "Windows XP Vista"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows XP Vista
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\helpsvc\Parameters
ServiceMain = "ServiceMain"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\svchost.exe = "%System%\svchost.exe:*:Enabled:Thunder"

Agrega las siguientes claves de registro como parte de la rutina de instalación:

HKEY_LOCAL_MACHINE\SOFTWARE\Tencent\
QQ

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\BITS

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\NTDISK Driver Extension

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Oogical Kisk Manager Administrative Service

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows XP Vista

Modifica las siguientes entradas de registro:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\helpsvc\Parameters
ServiceDll = "%System%\pchsvc.dll"

(Note: The default value data of the said registry entry is %Windows%\PCHealth\HelpCtr\Binaries\pchsvc.dll.)