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Ransom.Win32.TWOTHREELOCK.THEOCBD

October 24, 2024
 Analysis by: Leidryn Saludez
 ALIASES:

Ransom:Win32/Trinity.ATR!MTB (MICROSOFT)

 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 drops files as ransom note.

  TECHNICAL DETAILS

File Size:

524,800 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

02 May 2024

Payload:

Drops files, Encrypts files

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:

  • {Drive letter}:\{Random string derived from Volume Serial Number}.goodgame
  • \{Server Host Name}\{Encrypted Folder}\{Random string derived from Volume Serial Number}.goodgame

Other System Modifications

This Ransomware adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
pbsecGOOD = {Random Characters}

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
secpbGOOD = {Random Characters}

Other Details

This Ransomware does the following:

  • It encrypts files found in the following drive types:
    • Fixed drive
    • Removable drive
    • Network drive

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file name:

  • ntldr
  • pagefile.sys
  • ntdetect.com
  • autoexec.bat
  • desktop.ini
  • autorun.inf
  • ntuser.dat
  • iconcache.db
  • bootsect.bak
  • boot.ini
  • bootfont.bin
  • config.sys
  • io.sys
  • msdos.sys
  • ntuser.dat.log
  • thumbs.db
  • swapfile.sys
  • README.txt

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

  • .trinitylock

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

  • {Encrypted Directory}\README.txt

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.316.01

FIRST VSAPI PATTERN DATE:

02 May 2024

VSAPI OPR PATTERN File:

19.317.00

VSAPI OPR PATTERN Date:

03 May 2024

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.XXPE50FFF085

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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • pbsecGOOD = {Random Characters}
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • secpbGOOD = {Random Characters}

Step 5

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.  
  • {Drive letter}:\{Random string derived from Volume Serial Number}.goodgame
  • \{Server Host Name}\{Encrypted Folder}\{Random string derived from Volume Serial Number}.goodgame
  • {Encrypted Directory}\README.txt

Step 6

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.TWOTHREELOCK.THEOCBD. 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 7

Restore encrypted files from backup.


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