Author: Warren Adam Sto. Tomas   

 

ELF/Mirai.OX!tr (Fortinet)

 PLATFORM:

Linux

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

  • Threat Type:
    Backdoor

  • Destructiveness:
    No

  • Encrypted:
    Yes

  • In the wild:
    Yes

  OVERVIEW

This backdoor may spread to other devices by abusing a Remote Code Execution exploit in Huawei routers.

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

File size: 58,512 bytes
Memory resident: No
INITIAL SAMPLES RECEIVED DATE: 17 December 2018

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:

  • Download a file
  • Performs various DDOS attacks
  • Execute shell commands
  • Uses default or easy-to-guess usernames and passwords to login to other devices

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

  • cnc.ar{BLOCKED}yz:4532
  • scan.ar{BLOCKED}z:4532

Other Details

This Backdoor does the following:

  • It may spread to other devices by taking advantage of CVE-2017-17215 which is another remote code execution for specific Huawei routers
  • It uses the following credentials to try to login to other devices:
    • 123456
    • 888888
    • 20150602
    • 1q2w3e4r5
    • 2011vsta
    • 3ep5w2u
    • admintelecom
    • bcpb+serial#
    • default
    • e8ehome
    • e8telnet
    • fliruser
    • guest
    • huigu309
    • juniper123
    • klv1234
    • linux
    • maintainer
    • Maxitaxi01
    • super
    • support
    • taZz@01
    • taZz@23495859
    • telecomadmin
    • telnetadmin
    • tsgoingon
    • vstarcam2015
    • Zte521
    • ZXDSL
  • It displays the strings below once executed in the command line:
    • CIA NIGGER
  • It is capable of terminating processes which satisfies any of the following conditions:
    • uses any of the following ports:
      • 23
      • 8080
      • 81
      • 53413
    • memory of the process contains strings related to botnets

  SOLUTION

Minimum scan engine: 9.850
First VSAPI Pattern File: 14.694.04
First VSAPI Pattern Release Date: 17 December 2018
VSAPI OPR PATTERN-VERSION: 14.695.00
VSAPI OPR PATTERN DATE: 18 December 2018

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.MIRAI.AS. 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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