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Ransom.MSIL.LAPSUS.THKAFBC

November 17, 2023
 Analysis by: John Rainier Navato
 ALIASES:

Win32:RansomX-gen [Ransom] (AVAST)

 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:

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

  TECHNICAL DETAILS

File Size:

13,312 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 Nov 2023

Payload:

Encrypts files, Displays windows

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:

  • It displays its execution log and encryption progress in console.
  • It avoids encrypting files in the CD-ROM.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .7z
  • .bak
  • .conf
  • .csv
  • .dat
  • .db
  • .dbf
  • .doc
  • .docx
  • .dwg
  • .eml
  • .fbk
  • .FBK
  • .fdb
  • .FDB
  • .flv
  • .frm
  • .gif
  • .html
  • .ibd
  • .jpeg
  • .jpg
  • .json
  • .kdb
  • .kdbx
  • .ldb
  • .ldf
  • .LDF
  • .mai
  • .mdb
  • .mdf
  • .MDF
  • .msg
  • .odp
  • .ods
  • .odt
  • .ogg
  • .opt
  • .pdf
  • .png
  • .ppt
  • .pptx
  • .pst
  • .rar
  • .rtf
  • .sql
  • .sqlite
  • .tar
  • .tsv
  • .txt
  • .vb
  • .wab
  • .xls
  • .xlsx
  • .xml
  • .xml
  • .zip

It avoids encrypting files with the following strings in their file path:

  • Windows
  • System Volumen Information

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

  • .locked

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

  • {Encrypted Directory}\README.txt

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.822.01

FIRST VSAPI PATTERN DATE:

15 Nov 2023

VSAPI OPR PATTERN File:

18.823.00

VSAPI OPR PATTERN Date:

16 Nov 2023

Step 1

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 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

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.
  • {Encrypted Directory}\README.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.LAPSUS.THKAFBC. 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 5

Restore encrypted files from backup.


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