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IoT.Linux.MIRAI.DLET

December 16, 2019
 Analysis by: Patrick Angelo Roderno
 ALIASES:

a variant of Linux/Mirai.AJH trojan (ESET NOD32); ELF/Mirai.AJH!tr (FORTINET); Trojan.Linux.Mirai (IKARUS)

 PLATFORM:

Linux

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

  • Threat Type: Others

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

34,224 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

18 Nov 2019

Payload:

Connects to URLs/IPs

Arrival Details

This Others 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 Others executes the following command(s) from a remote malicious user:

  • Arbitrary code execution

Other Details

This Others does the following:

  • Performs brute force on port 23 using the following credentials:
    • root
    • aquario
    • root
    • 88
    • root
    • ding1234
    • root
    • 5up
    • root
    • 888
    • guest
    • 123
    • admin
    • 1234qwer
    • admin
    • adminHW
    • root
    • 000000
    • nexxadmin
    • y1n2inc.com
    • root
    • antslq
    • root
    • 222222
    • root
    • 1234
    • root
    • 1111
    • 666666
    • 666666
    • service
    • service
    • root
    • 88888
    • administrator
    • 1234
    • root
    • 123456
    • root
    • 333333
    • e8ehome1
    • e8ehome1
  • It connects to the remote address {BLOCKED}.{BLOCKED}.{BLOCKED}7.65:7685 to gather the credentials used in brute force attack
  • Prints the string "9xsspnvgc8aj5pi7m28p" in the console

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.562.03

FIRST VSAPI PATTERN DATE:

16 Dec 2019

VSAPI OPR PATTERN File:

15.563.00

VSAPI OPR PATTERN Date:

17 Dec 2019

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