Analysis by: Karen Ivy Titiwa
ALIASES:

Gen:Variant.Trojan.Linux.Mirai.3(BITDEFENDER); Trojan.Linux.Mirai(IKARUS)

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Canal de infección Downloaded from the Internet

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 connects to a website to send and receive information.

It downloads a file from a certain URL then renames it before storing it in the affected system.

  TECHNICAL DETAILS

Tamaño del archivo 137,980 bytes
Tipo de archivo ELF
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 21 Jul 2020
Carga útil Connects to URLs/IPs, Downloads files, Compromises system security

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.

Installation

This Backdoor adds the following processes:

  • ./zyxel zyxel.exploit
  • ./FuckinToaster.mpsl asus.exploit
  • ./FuckinToaster.mpsl linksys.exploit

Backdoor Routine

This Backdoor connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.53.27

Download Routine

This Backdoor connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.53.27/Scylla.sh
  • http://{BLOCKED}.{BLOCKED}.53.27/FuckMalwareResearchers/FuckinToaster.mpsl

It downloads files from the following URLs then renames them before storage in the affected system:

  • /tmp/Scylla.sh
  • /var/tmp/Scylla.sh

It saves the files it downloads using the following names:

  • thonkphp
  • scylla.sh

Other Details

This Backdoor takes advantage of the following exploit(s):

  SOLUTION

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 16.118.04
Primera fecha de publicación de patrones de VSAPI 22 Jul 2020
Versión de patrones OPR de VSAPI 16.119.00
Fecha de publicación de patrones OPR de VSAPI 23 Jul 2020

Scan your computer with your Trend Micro product to delete files detected as IoT.Linux.MIRAI.VWIUR. 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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