Analysis by: Wilbert Luy
ALIASES:

HEUR:Backdoor.Linux.Mirai.h (Kaspersky), Backdoor:Linux/DemonBot.YA!MTB (Microsoft)

 PLATFORM:

Linux

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Canal de infección Dropped by other malware, Downloaded from the Internet

This backdoor is seen propagating via CVE-2018-18636, a cross-site scripting vulnerability affecting the wireless router D-Link DSL-2640T. This malware is capable of receiving commands to flood other systems.

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

Tamaño del archivo 62,028 bytes
Tipo de archivo ELF
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 19 Aug 2019
Carga útil Connects to URLs/IPs, Collects system information, Others

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • UDP - UDP flood
  • TCP - TCP flood
  • HEX - UDP HEX flood
  • STOP - STOP bot operation

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • 5.{BLOCKED}.{BLOCKED}.216:41061

Other Details

This Backdoor does the following:

  • Checks for the following folder to know architecture:
    • /usr/bin/apt-get - Ubuntu
    • /usr/lib/portage - Gentoo
    • /usr/bin/yum - CentOS
    • /usr/share/YaST2 - OpenSUSE
    • /usr/local/etc/pkg - FreeBSD
    • /etc/dropbear/ - Dropbear
    • /etc/opkg - OpenWRT

  SOLUTION

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 14.880.05
Primera fecha de publicación de patrones de VSAPI 19 Mar 2019
Versión de patrones OPR de VSAPI 14.881.00
Fecha de publicación de patrones OPR de VSAPI 20 Mar 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.BASHLITE.SMJC2. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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