Analysis by: Neljorn Nathaniel Aguas
ALIASES:

TrojanDownloader:Linux/Mirai.C!MTB (MICROSOFT)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 1,364 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 07 Sep 2025
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan does not have rootkit capabilities.

Download Routine

This Trojan downloads the file from the following URL and renames the file when stored in the affected system:

  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.27/bins/mirai.x86

It saves the files it downloads using the following names:

  • {Malware Path}/sshd

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan does the following:

  • It prints "MIRAI" identification banner to stdout during execution.
  • It prints "NIF" error message on network interface failure.
  • It prints "FIN" completion message after successful download.

However, as of this writing, the said sites are inaccessible.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.442.07
FIRST VSAPI PATTERN DATE: 07 Sep 2025
VSAPI OPR PATTERN File: 20.443.00
VSAPI OPR PATTERN Date: 08 Sep 2025

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    • Troj.ELF.TRX.XXELFC1DFF055  

Step 2

Scan your computer with your Trend Micro product to delete files detected as Trojan.Linux.MIRAI.NLJ. 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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