Análisis realizado por : Patrick Angelo Roderno   
 Alias

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

 Plataforma:

Linux

 Riesgo general:
 Potencial de destrucción:
 Potencial de distribución:
 Infección divulgada:
 Revelación de la información:
Bajo
Medio
High
Crítico

  • Tipo de malware
    Backdoor

  • Destructivo?
    No

  • Cifrado
    No

  • In the Wild:
    Sí

  Resumen y descripción

Canal de infección 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.

  Detalles técnicos

Tamaño del archivo 1,223,123 bytes
Tipo de archivo ELF
Residente en memoria No
Fecha de recepción de las muestras iniciales 01 noviembre 2018
Carga útil 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:

  • {BLOCKED}.{BLOCKED}.163.68
  • {BLOCKED}.{BLOCKED}.192.68
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  • {BLOCKED}.{BLOCKED}.2.2
  • {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
  • {BLOCKED}.{BLOCKED}.46.151
  • {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}.32.103
  • {BLOCKED}.{BLOCKED}.32.106
  • {BLOCKED}.{BLOCKED}.32.109
  • {BLOCKED}.{BLOCKED}.33.52
  • {BLOCKED}.{BLOCKED}.33.60
  • {BLOCKED}.{BLOCKED}.3.70
  • {BLOCKED}.{BLOCKED}.3.73
  • {BLOCKED}.{BLOCKED}.3.76
  • {BLOCKED}.{BLOCKED}.3.79
  • {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
  • {BLOCKED}.{BLOCKED}.145.194
  • {BLOCKED}.{BLOCKED}.151.161
  • {BLOCKED}.{BLOCKED}.156.66
  • {BLOCKED}.{BLOCKED}.152.99
  • {BLOCKED}.{BLOCKED}.157.99
  • {BLOCKED}.{BLOCKED}.29.93
  • {BLOCKED}.{BLOCKED}.107.85
  • {BLOCKED}.{BLOCKED}3.255.228
  • {BLOCKED}.{BLOCKED}.62.142
  • {BLOCKED}.{BLOCKED}.33.240
  • {BLOCKED}.{BLOCKED}.121.27
  • {BLOCKED}.{BLOCKED}.160.194
  • {BLOCKED}.{BLOCKED}4.10
  • {BLOCKED}.{BLOCKED}.70.98
  • {BLOCKED}.{BLOCKED}.211.22
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.128.86
  • {BLOCKED}.{BLOCKED}.128.166
  • {BLOCKED}.{BLOCKED}.3.140
  • {BLOCKED}.{BLOCKED}.4.130
  • {BLOCKED}.{BLOCKED}.193.97
  • {BLOCKED}.{BLOCKED}.2.4
  • {BLOCKED}.{BLOCKED}.4.1
  • {BLOCKED}.{BLOCKED}.61.225
  • {BLOCKED}.{BLOCKED}.61.235
  • {BLOCKED}.{BLOCKED}.61.255
  • {BLOCKED}.{BLOCKED}.62.1
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  • {BLOCKED}.{BLOCKED}.66.66
  • {BLOCKED}.{BLOCKED}.176.22
  • {BLOCKED}.{BLOCKED}.144.47
  • {BLOCKED}.{BLOCKED}.192.33
  • {BLOCKED}.{BLOCKED}.134.33
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  • {BLOCKED}.{BLOCKED}.154.15
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  • {BLOCKED}.{BLOCKED}.88.88
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  • {BLOCKED}.{BLOCKED}.64.33
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  • {BLOCKED}.{BLOCKED}.242.18
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  • {BLOCKED}.{BLOCKED}.192.67
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  • {BLOCKED}.{BLOCKED}.2.18
  • {BLOCKED}.{BLOCKED}.192.68
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  • {BLOCKED}.{BLOCKED}.168.8
  • {BLOCKED}.{BLOCKED}.222.222
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.227.68
  • {BLOCKED}.{BLOCKED}.85.85
  • {BLOCKED}.{BLOCKED}.88.88
  • {BLOCKED}.{BLOCKED}.241.1
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  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.127.1
  • {BLOCKED}.{BLOCKED}.93.33
  • {BLOCKED}.{BLOCKED}.24.129
  • {BLOCKED}.{BLOCKED}.241.34
  • {BLOCKED}.{BLOCKED}.198.230
  • {BLOCKED}.{BLOCKED}.0.68
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  • {BLOCKED}.{BLOCKED}.0.242
  • {BLOCKED}.{BLOCKED}.240.6
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  • {BLOCKED}.{BLOCKED}.127.122
  • {BLOCKED}.{BLOCKED}.129.30
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  • {BLOCKED}.{BLOCKED}.64.68
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  • {BLOCKED}.{BLOCKED}.255.1
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  • {BLOCKED}.{BLOCKED}.224.68
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  • {BLOCKED}.{BLOCKED}.96.68
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  • {BLOCKED}.{BLOCKED}.96.68
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  • {BLOCKED}.{BLOCKED}.252.8
  • {BLOCKED}.{BLOCKED}.128.32
  • {BLOCKED}.{BLOCKED}.96.9
  • {BLOCKED}.{BLOCKED}.100.18
  • {BLOCKED}.{BLOCKED}.100.21
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  • {BLOCKED}.{BLOCKED}.94.241
  • {BLOCKED}.{BLOCKED}.1.20
  • {BLOCKED}.{BLOCKED}.114.133
  • {BLOCKED}.{BLOCKED}.114.166
  • {BLOCKED}.{BLOCKED}.152.130
  • {BLOCKED}.{BLOCKED}.150.123
  • {BLOCKED}.{BLOCKED}.128.33
  • {BLOCKED}.{BLOCKED}.72.7
  • {BLOCKED}.{BLOCKED}.29.68
  • {BLOCKED}.{BLOCKED}.29.150
  • {BLOCKED}.{BLOCKED}.29.170
  • {BLOCKED}.{BLOCKED}.131.11
  • {BLOCKED}.{BLOCKED}.200.68
  • {BLOCKED}.{BLOCKED}.150.101
  • {BLOCKED}.{BLOCKED}.150.139
  • {BLOCKED}.{BLOCKED}.144.33
  • {BLOCKED}.{BLOCKED}.160.33
  • {BLOCKED}.{BLOCKED}.192.33
  • {BLOCKED}.{BLOCKED}.208.33
  • {BLOCKED}.{BLOCKED}.224.33
  • {BLOCKED}.{BLOCKED}.144.161
  • {BLOCKED}.{BLOCKED}.5.240
  • {BLOCKED}.{BLOCKED}.25.129
  • {BLOCKED}.{BLOCKED}.103.36
  • {BLOCKED}.{BLOCKED}.1.227
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  • {BLOCKED}.{BLOCKED}.120.5
  • {BLOCKED}.{BLOCKED}.96.68
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  • {BLOCKED}.{BLOCKED}.248.245
  • {BLOCKED}.{BLOCKED}.254.34
  • {BLOCKED}.{BLOCKED}.244.5
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  • {BLOCKED}.{BLOCKED}.104.26
  • {BLOCKED}.{BLOCKED}.33.227
  • {BLOCKED}.{BLOCKED}.107.27
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.17.2
  • {BLOCKED}.{BLOCKED}.203.86
  • {BLOCKED}.{BLOCKED}.203.90
  • {BLOCKED}.{BLOCKED}.203.98
  • {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

  Soluciones

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 14.568.04
Primera fecha de publicación de patrones de VSAPI 16 de octubre de 2018
Versión de patrones OPR de VSAPI 15.237.00
Fecha de publicación de patrones OPR de VSAPI 16 de julio 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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