Author: Melvin Jhun Palbusa   
 

Win32:BackdoorX-gen [Trj] (AVAST)

 PLATFORM:

Windows

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

  • Threat Type:
    Backdoor

  • Destructiveness:
    No

  • Encrypted:
     

  • In the wild::
    Yes

  OVERVIEW

INFECTION CHANNEL: Descargado de Internet, Eliminado por otro tipo de malware

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: 291,328 bytes
File type: DLL
Memory resident: No
INITIAL SAMPLES RECEIVED DATE: 30 de июня de 2023

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.

Otros detalles

Hace lo siguiente:

  • It modifies responses to HTTP requests from selected search engine web crawlers to serve a malicious JavaScript file, potentially redirect code that would force the search engine to follow the redirect and index the content of the attacker’s choice
    • It requires the following parameters of the handled requests:
      • Content-Type header is set to text/html
      • The relative URL of the request contains one of the following substrings:
        • index.php
      • User-Agent header contains one of the following substrings:
        • baidu
        • sogou
        • yisou
        • baidu.com
        • sogou.com
        • so.com
        • sm.cn
  • It replaces responses to HTTP requests from web crawlers with attacker-controlled content.
    • Search engine crawler requests are recognized when the following two conditions matched:
      • The request URL contains one of these substrings:
        • .php
        • .asp
        • .aspx
        • .jsp
        • .html
        • .htm
      • The User-Agent header contains one of these substrings:
        • baidu.com
        • sogou.com
        • so.com
        • sm.cn
        • bing.com
        • google
        • coccoc
  • It replaces responses to HTTP requests from selected visitors with malicious/unwanted content.

  SOLUTION

Minimum scan engine: 9.800
First VSAPI Pattern File: 18.540.05
First VSAPI Pattern Release Date: 30 de июня de 2023
VSAPI OPR PATTERN-VERSION: 18.541.00
VSAPI OPR PATTERN DATE: 01 de июля de 2023

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

Explorar el equipo con su producto de Trend Micro para eliminar los archivos detectados como Backdoor.Win32.BADIIS.A 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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