Virus.X97M.LAROUX.A

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Este malware no tiene ninguna rutina de propagación.

Este malware no tiene ninguna rutina de puerta trasera.

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.

Propagación

Este malware no tiene ninguna rutina de propagación.

Rutina de puerta trasera

Este malware no tiene ninguna rutina de puerta trasera.

Otros detalles

Hace lo siguiente:

• It will remain active every time Excel is launched, infecting any new workbooks created and previously saved workbooks when they are opened.
• It checks for a file named "PERSONAL.XLS" in the Excel startup path and if the currently active workbook contains any VBA modules.
  • If PERSONAL.XLS exists and the currently active workbook does not contain any VBA modules:
    • It copies a sheet named "laroux" from "PERSONAL.XLS" and paste it as the first sheet in the currently active Excel workbook.
    • It sets the copied sheet to hidden.
    • It assigns a macro from "PERSONAL.XLS" in the currently active Excel workbook for persistence
  • If PERSONAL.XLS doesn't exist and the currently active workbook contains any VBA modules:
    • It unhides a sheet named "laroux" in the currently active workbook
    • It copies the "laroux" sheet into a new workbook.
    • It sets the copied sheet to hidden.
    • It sets the following file attributes to null:
      • Title
      • Author
      • Subject
      • Keywords
      • Comments
    • It saves the new workbook as:
      • %Application Data%\Microsoft\Excel\XLSTART\PERSONAL.XLS
    • It assigns a macro from "PERSONAL.XLS" in the currently active Excel workbook for persistence

(Nota: %Application Data% es la carpeta Application Data del usuario activo, que en el caso de Windows 98 y ME suele estar ubicada en C:\Windows\Profiles\{nombre de usuario}\Application Data, en el caso de Windows NT en C:\WINNT\Profiles\{nombre de usuario}\Application Data, en el caso de Windows 2000(32-bit), XP y Server 2003(32-bit) en C:\Documents and Settings\{nombre de usuario}\Local Settings\Application Data y en el caso de Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) y 10(64-bit) en C:\Users\{nombre de usuario}\AppData\Roaming.).