Analysis by: Melvin Jhun Palbusa
ALIASES:

Ransom:Win32/CylanCrypt.PAC!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

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. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size: 142,336 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 03 Dec 2023
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 adds the following processes:

  • cmd.exe /c vssadmin.exe delete shadows /all /quiet
  • cmd.exe /c ping 127.0.0.1 -n 4 > nul & del \"{Malware File name}\" → if -selfdel is used

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Global\ELECTRONICMutex

Dropping Routine

This Ransomware drops the following files:

  • {Malware File Path}\ELECTRONIC.CPP → Contains log activities

Other Details

This Ransomware does the following:

  • Empty Recycled Bin
  • By default, it encrypts removable, fixed, and remote drives
  • It uses the Windows Restart Manager API to close processes or shut down Windows services that may be keeping a file open and preventing encryption.

It accepts the following parameters:

  • -path → Specify the path to encrypt
  • -ratio → Encryption ratio
  • -nomutex → Execute without generating a mutex
  • -nonetdrive → Exclude network drive from encryption
  • -selfdel → Delete itself after execution

Ransomware Routine

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

  • Ntldr
  • Ntuser.dat
  • Bootsect.bak
  • Ntuser.dat.log
  • Autorun.inf
  • Thumbs.db
  • Iconcache.db
  • Bootfont.bin
  • Boot.ini
  • Desktop.ini
  • Ntuser.ini
  • Bootmgr
  • ELECTRONIC.CPP
  • README ELECETRONICS.txt

It avoids encrypting files found in the following folders:

  • Windows
  • $windows.~bt
  • $Windows.!ws
  • Windows.old
  • Windows nt
  • All Users
  • Public
  • Boot
  • Intel
  • PerfLogs
  • System Volume Information
  • MSOCache
  • $RECYCLE.BIN
  • Default
  • Config.Msi
  • Tor browser
  • Microsoft
  • Google
  • Yandex
  • Microsoft Visual Studio 16.0

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

  • .EMAIL=[{BLOCKED}nicrans@gmail.com ]ID=[{Generated ID}].ELECTRONIC

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

  • {Encrypted Directory}\README ELECTRONIC.txt

It avoids encrypting files with the following file extensions:

  • .sys
  • .drv
  • .efi
  • .msi
  • .lnk
  • .ELECTRONIC

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.858.01
FIRST VSAPI PATTERN DATE: 03 Dec 2023
VSAPI OPR PATTERN File: 18.859.00
VSAPI OPR PATTERN Date: 04 Dec 2023

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.XXPE50FFF075

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}\ELECTRONIC.CPP

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.BTCAZADI.THLODBC. 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:


Did this description help? Tell us how we did.