Analysis by: Ricardo III Valdez
ALIASES:

Ransom:Win32/FileEncoder.A!MTB (MICROSOFT)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 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: 2,382,336 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 15 Nov 2022

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:

  • {Malware File Path}\{Random Characters 1}.bat
  • {Malware File Path}\{Random Characters 2}.bat

It adds the following processes:

  • cmd /c "{Malware File Path}\{Random Characters 1}.bat"
  • cmd /c "{Malware File Path}\{Random Characters 2}.bat"
  • SC QUERY
  • FINDSTR SERVICE_NAME

Other System Modifications

This Ransomware deletes the following files:

  • {Malware File Path}\{Random Characters 1}.bat
  • {Malware File Path}\{Random Characters 2}.bat

Ransomware Routine

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

  • .yguekcbe

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

  • {Encrypted Folder}\HOW TO RESTORE YOUR FILES.TXT

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 17.938.04
FIRST VSAPI PATTERN DATE: 15 Nov 2022
VSAPI OPR PATTERN File: 17.939.00
VSAPI OPR PATTERN Date: 16 Nov 2022

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.Win32.TRX.XXPE50FFF062

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

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 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • {Malware File Path}\{Random Characters 1}.bat
  • {Malware File Path}\{Random Characters 2}.bat
  • {Encrypted Folder}\HOW TO RESTORE YOUR FILES.TXT

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.SNATCH.G. 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 6

Restore encrypted files from backup.


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