Analysis by: Alyssa Christelle Ramos
 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • 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 found in specific folders. It drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size: 1,847,296 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 07 Mar 2020
Payload: Displays graphics/image, Drops 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:

  • ControlzEx.dll
  • MahApps.Metro.dll
  • System.Windows.Interactivity.dll

It drops and executes the following files:

  • @MMDecrypt0r@.exe - detected as Ransom.MSIL.KESLAN.D

Other System Modifications

This Ransomware sets the system's desktop wallpaper to the following image:


Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • %Desktop%
  • %User Profile%\Documents
  • %User Profile%\Music
  • %User Profile%\Pictures
  • %User Profile%\Videos
  • %Public%\Documents
  • %Public%\Music
  • %Public%\Pictures
  • %Public%\Videos

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

It renames encrypted files using the following names:

  • {Filename}.TRSomware

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

  • @Lütfen Beni Oku!@.txt

It avoids encrypting files with the following file extensions:

  • .exe
  • .ini
  • .dll
  • .sys

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.728.02
FIRST VSAPI PATTERN DATE: 07 Mar 2020
VSAPI OPR PATTERN File: 15.729.00
VSAPI OPR PATTERN Date: 08 Mar 2020

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.XXPE50FFF034

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 these files

[ 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.
  • %Desktop%\@Lütfen Beni Oku!@.txt
  • %User Profile%\Documents\@Lütfen Beni Oku!@.txt
  • %User Profile%\Music\@Lütfen Beni Oku!@.txt
  • %User Profile%\Pictures\@Lütfen Beni Oku!@.txt
  • %User Profile%\Videos\@Lütfen Beni Oku!@.txt
  • %Public%\Documents\@Lütfen Beni Oku!@.txt
  • %Public%\Music\@Lütfen Beni Oku!@.txt
  • %Public%\Pictures\@Lütfen Beni Oku!@.txt
  • %Public%\Videos\@Lütfen Beni Oku!@.txt

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.TRSOMWARE.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 6

Restore encrypted files from backup.


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