Analysis by: Ryan Paolo Maglaque
ALIASES:

Linux.Trojan(Norton);a variant of Linux/Filecoder.F(Eset-NOD32);ELF:Filecoder-K [Trj](Avast)

 PLATFORM:

Linux

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

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 connects to certain websites to send and receive information.

It encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 3,151,816 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 13 Oct 2016
Payload: Encrypts files, Connects to URLs/IPs

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.

Installation

This Ransomware drops the following files:

  • {encrypted file}.{original file extension}.PRM.AESKEY

Other System Modifications

This Ransomware deletes the following files:

  • .bash_history

Information Theft

This Ransomware gathers the following data:

  • etc/shadow
  • etc/hosts
  • .ssh/id_rsa
  • .ssh/id_dsa
  • .ssh/id_ecdsa
  • .ssh/id_ed25519
  • .ssh/known_hosts

Other Details

This Ransomware connects to the following website to send and receive information:

  • http://www.{BLOCKED}europe.net/evl/grab/xx/get.php

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .doc
  • .xls
  • .ppt
  • .docx
  • .xlsx
  • .pptx
  • .pdf

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

  • .PRM.TMPFILE

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

  • {encrypted file}.{original file extension}.info

It leaves text files that serve as ransom notes containing the following text:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 12.876.06
FIRST VSAPI PATTERN DATE: 03 Nov 2016
VSAPI OPR PATTERN File: 12.877.00
VSAPI OPR PATTERN Date: 04 Nov 2016

Step 1

Scan your computer with your Trend Micro product to delete files detected as RANSOM_ARTTEC.DJB. 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 this Knowledge Base page for more information.

Step 2

Restore encrypted files from backup.


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