Analysis by: Michael Jhon Ofiaza
ALIASES:

HEUR:Trojan-Ransom.MSIL.Encoder.gen (Kaspersky)

 PLATFORM:

Windows

 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: 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 encrypts files found in specific folders. It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 56,832 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 04 Nov 2018
Payload: Displays graphics/image

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.

Other Details

This Ransomware does the following:

  • Displays the following after execution:


Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .txt
  • .doc
  • .docx
  • .xls
  • .xlsx
  • .ppt
  • .pptx
  • .odt
  • .jpg
  • .png
  • .csv
  • .sql
  • .mdb
  • .sln
  • .php
  • .asp
  • .aspx
  • .psd
  • .zip
  • .7z
  • .egg
  • .mp1
  • .mp2
  • .mp3
  • .mp4
  • .hwp
  • .py
  • .js
  • .cpp
  • .h
  • .c
  • .bat
  • .vbs
  • .rar
  • .hta
  • .css
  • .html
  • .cs
  • .resx
  • .settings

It encrypts files found in the following folders:

  • C:\Users\{Username}\Desktop

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

  • C:\Users\{Username}\Desktop\@READ_IT@.txt


  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.684.03
FIRST VSAPI PATTERN DATE: 12 Dec 2018
VSAPI OPR PATTERN File: 14.685.00
VSAPI OPR PATTERN Date: 13 Dec 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.FILEF.THAAOEAI. 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 4

Restore encrypted files from backup.


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