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 infecção: 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

Tipo de compactação: 137,980 bytes
Tipo de arquivo: ELF
Residente na memória: Yes
Data de recebimento das amostras iniciais: 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

Mecanismo de varredura mínima: 9.850
Primeiro arquivo padrão VSAPI: 16.118.04
Data do lançamento do primeiro padrão VSAPI: 22 Jul 2020
VSAPI OPR Pattern Version: 16.119.00
VSAPI OPR Pattern veröffentlicht am: 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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