Analysis by: Warren Adam Sto. Tomas
 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

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.

  TECHNICAL DETAILS

File Size: 217 bytes
File Type: Other
Memory Resident: No
Initial Samples Received Date: 11 Dec 2021

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.

Download Routine

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

  • http://{BLOCKED}130.250/web/admin/x86
  • http://{BLOCKED}130.250/web/admin/x86_g
  • http://{BLOCKED}130.250/web/admin/x86_64

It saves the files it downloads using the following names:

  • x86 -> detected as Backdoor.Linux.MIRAI.SEMR
  • x86_g -> detected as Backdoor.Linux.MIRAI.SEMR
  • x86_64 -> detected as Backdoor.Linux.MIRAI.SEMR

Other Details

This Trojan executes the downloaded file using the following commands:

  • ./x86 x86
  • ./x86_g x86_g
  • ./x86_g x86_64

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 17.248.04
FIRST VSAPI PATTERN DATE: 12 Dec 2021
VSAPI OPR PATTERN File: 17.249.00
VSAPI OPR PATTERN Date: 13 Dec 2021

Scan your computer with your Trend Micro product to delete files detected as Trojan.SH.MIRAI.MKF. 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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