Analysis by: Raymart Christian Yambot
 PLATFORM:

Linux

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

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

It encrypts files with specific file extensions. It drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size: 74,392 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 10 Apr 2024
Payload: Encrypts files

Arrival Details

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

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .vmdk
  • .ovf
  • .ova
  • .vmem
  • .vswp
  • .vmsd
  • .vmsn
  • .vib
  • .vbk
  • .vbm

It appends the following extension to the file name of the encrypted files:

  • .emario

It drops the following file(s) as ransom note:

  • {Encrypted Directory}\How To Restore Your Files.txt

It avoids encrypting files with the following file extensions:

  • .mario
  • .wmario
  • .lmario
  • .emario
  • .nmario
  • .mmario

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.512.05
FIRST VSAPI PATTERN DATE: 16 Jun 2023
VSAPI OPR PATTERN File: 18.513.00
VSAPI OPR PATTERN Date: 17 Jun 2023

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 Ransom.Linux.OIMAR.SMYNDFD. 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:

Step 3

Restore encrypted files from backup.


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