Author: Patrick Angelo Roderno   
 

Linux.Chikdos.B!gen2 (NORTON); Backdoor:Linux/Setag!rfn (MICROSOFT); HEUR:Backdoor.Linux.Ganiw.d (KASPERSKY)

 PLATFORM:

Linux

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

  • Threat Type:
    Backdoor

  • Destructiveness:
    No

  • Encrypted:
    No

  • 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.

Ejecuta comandos desde un usuario remoto malicioso que pone en peligro el sistema afectado.

Se conecta a determinados sitios Web para enviar y recibir información.

  TECHNICAL DETAILS

File size: 1,223,123 bytes
File type: ELF
Memory resident: No
INITIAL SAMPLES RECEIVED DATE: 01 ноября 2018
PAYLOAD: Drops files, Connects to URLs/IPs, Steals information

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

Crea las siguientes copias de sí mismo en el sistema afectado y las ejecuta:

  • /usr/bin/bsd-port/getty

Crea las carpetas siguientes:

  • /usr/bin/dpkgd
  • /usr/bin/bsd-port

Rutina de puerta trasera

Ejecuta los comandos siguientes desde un usuario remoto malicioso:

  • Initiate DDoS attacks:
    • SYN flood
    • DNS flood
    • ICMP flood
    • UDP flood
    • TCP flood
    • TNS poisoning
    • Challenge Collapsar (CC) attack
  • Stop DDoS attack
  • Execute shell commands

Rutina de infiltración

Infiltra los archivos siguientes:

  • /usr/bin/bsd-port/getty.lock
  • /tmp/gates.lod
  • /tmp/moni.lod
  • /tmp/notify.file

Robo de información

Recopila los siguientes datos:

  • OS name
  • OS version
  • CPU clock rate
  • CPU usage
  • Number of CPU cores
  • Network usage
  • RAM size
  • IP address of infected machine

Otros detalles

Se conecta al sitio Web siguiente para enviar y recibir información:

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  • {BLOCKED}.{BLOCKED}.64.1
  • {BLOCKED}.{BLOCKED}.88.129
  • {BLOCKED}.{BLOCKED}.180.2
  • {BLOCKED}.{BLOCKED}.78.2
  • {BLOCKED}.{BLOCKED}.199.68
  • {BLOCKED}.{BLOCKED}.3.3
  • {BLOCKED}.{BLOCKED}.3.8
  • {BLOCKED}.{BLOCKED}.144.30
  • {BLOCKED}.{BLOCKED}.9.9
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  • {BLOCKED}.{BLOCKED}.160.110
  • {BLOCKED}.{BLOCKED}.7.6
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  • {BLOCKED}.{BLOCKED}.0.20
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  • {BLOCKED}.{BLOCKED}.195.68
  • {BLOCKED}.{BLOCKED}.196.115
  • {BLOCKED}.{BLOCKED}.196.212
  • {BLOCKED}.{BLOCKED}.196.228
  • {BLOCKED}.{BLOCKED}.196.230
  • {BLOCKED}.{BLOCKED}.196.232
  • {BLOCKED}.{BLOCKED}.196.237
  • {BLOCKED}.{BLOCKED}.112.10
  • {BLOCKED}.{BLOCKED}.17.107
  • {BLOCKED}.{BLOCKED}.28.231
  • {BLOCKED}.{BLOCKED}.28.234
  • {BLOCKED}.{BLOCKED}.28.237
  • {BLOCKED}.{BLOCKED}.6.3
  • {BLOCKED}.{BLOCKED}.136.10
  • {BLOCKED}.{BLOCKED}.140.10
  • {BLOCKED}.{BLOCKED}.148.37
  • {BLOCKED}.{BLOCKED}.148.39
  • {BLOCKED}.{BLOCKED}.26.42
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  • {BLOCKED}.{BLOCKED}.32.106
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  • {BLOCKED}.{BLOCKED}.33.60
  • {BLOCKED}.{BLOCKED}.3.70
  • {BLOCKED}.{BLOCKED}.3.73
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  • {BLOCKED}.{BLOCKED}.3.83
  • {BLOCKED}.{BLOCKED}.3.85
  • {BLOCKED}.{BLOCKED}.4.6
  • {BLOCKED}.{BLOCKED}.4.9
  • {BLOCKED}.{BLOCKED}.4.12
  • {BLOCKED}.{BLOCKED}.4.15
  • {BLOCKED}.{BLOCKED}.4.18
  • {BLOCKED}.{BLOCKED}.4.21
  • {BLOCKED}.{BLOCKED}.96.66
  • {BLOCKED}.{BLOCKED}.128.106
  • {BLOCKED}.{BLOCKED}.98.55
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  • {BLOCKED}.{BLOCKED}.156.66
  • {BLOCKED}.{BLOCKED}.152.99
  • {BLOCKED}.{BLOCKED}.157.99
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  • {BLOCKED}.{BLOCKED}3.255.228
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  • {BLOCKED}.{BLOCKED}.2.4
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  • {BLOCKED}.{BLOCKED}.200.68
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  • {BLOCKED}.{BLOCKED}.150.139
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  • {BLOCKED}.{BLOCKED}.25.129
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  • {BLOCKED}.{BLOCKED}.203.86
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  • {BLOCKED}.{BLOCKED}.92.86
  • {BLOCKED}.{BLOCKED}.92.98

Hace lo siguiente:

  • capable of updating itself to its latest version
  • replaces the following files with the copy of the malware and stores the original files in /usr/bin/dpkg/:
    • /bin/netstat
    • /bin/lsof
    • /bin/ps
    • /bin/ss
    • /usr/bin/netstat
    • /usr/bin/lsof
    • /usr/bin/ps
    • /usr/bin/ss
    • /usr/sbin/netstat
    • /usr/sbin/lsof
    • /usr/sbin/ps
    • /usr/sbin/ss
  • It adds the following scripts in /etc/rc{1-5}.d/ and /etc/init.d/ to automatically execute itself when the system starts up:
    • /etc/rc{1-5}.d/S97DbSecuritySpt
    • /etc/rc{1-5}.d/S99selinux
    • /etc/init.d/selinux
    • /etc/init.d/DbSecuritySpt

  SOLUTION

Minimum scan engine: 9.850
First VSAPI Pattern File: 14.568.04
First VSAPI Pattern Release Date: 16 de октября de 2018
VSAPI OPR PATTERN-VERSION: 15.237.00
VSAPI OPR PATTERN DATE: 16 de июля de 2019

Explorar el equipo con su producto de Trend Micro para eliminar los archivos detectados como Backdoor.Linux.SETAG.RPA 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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