Analysis by: John Donnie Celestre
ALIASES:

W64/Filecoder.U!tr.ransom (FORTINET), a variant of Win64/Filecoder.U trojan (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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 drops files as ransom note.

  TECHNICAL DETAILS

File Size: 637,952 bytes
File Type: EXE
Initial Samples Received Date: 11 Dec 2018

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 adds the following processes:

  • vssadmin delete shadows /all /quiet

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • .evolution

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

  • !#_Read_me_for_recovery_#!.txt

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.682.08
FIRST VSAPI PATTERN DATE: 11 Dec 2018
VSAPI OPR PATTERN File: 14.683.00
VSAPI OPR PATTERN Date: 12 Dec 2018

Step 1

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.EVOLUTION.A. 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 2

Restore encrypted files from backup.


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