Analysis by: Neljorn Nathaniel Aguas
ALIASES:

Backdoor:Linux/Mirai.AY!xp (MICROSOFT)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

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: 55,408 bytes
File Type: ELF
Initial Samples Received Date: 19 Mar 2024
Payload: Connects to URLs/IPs, Restarts system

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.

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.{BLOCKED}.8:53
  • {BLOCKED}.{BLOCKED}.{BLOCKED}.199:1312
  • {BLOCKED}.{BLOCKED}.{BLOCKED}.63:7777

It does the following:

  • It creates a TCP socket and listens for incoming connections by binding it to the following loopback address:
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.1:46237
  • It creates and sets the name of its child processes using the following:
    • /bin/sh
  • It deletes itself after spawning its child processes.
  • It checks for the following files related to watchdog to disable its functions if found:
    • /bin/watchdog
    • /dev/FTWDT101_watchdog
    • /dev/FTWDT101/watchdog
    • /dev/watchdog0
    • /etc/default/watchdog
    • /etc/watchdog
  • It restarts the system after all the child processes terminates.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.230.06
FIRST VSAPI PATTERN DATE: 21 Mar 2024
VSAPI OPR PATTERN File: 19.231.00
VSAPI OPR PATTERN Date: 22 Mar 2024

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.XXELFC1DFF038

Step 2

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