Analysis by: John Rainier Navato
ALIASES:

Trojan-Ransom.FileCrypter (IKARUS)

 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 connects to certain websites to send and receive information.

It encrypts files found in specific folders. It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 19,968 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 04 Sep 2024
Payload: Connects to URLs/IPs, 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:

  • {Malware File Path}\{Malware File Name} → when not ran with administrator privileges

Other Details

This Ransomware connects to the following website to send and receive information:

  • https://{BLOCKED}honanywhere.com/c2/receiver

It encrypts files with the following extensions:

  • .7z
  • .aac
  • .accdb
  • .adt
  • .aiff
  • .avi
  • .bak
  • .bat
  • .bmp
  • .c
  • .cfg
  • .cmd
  • .conf
  • .contact
  • .cpp
  • .css
  • .dat
  • .db
  • .doc
  • .docx
  • .eml
  • .exe
  • .flac
  • .gif
  • .gz
  • .htm
  • .html
  • .ics
  • .ini
  • .iso
  • .java
  • .jpeg
  • .jpg
  • .js
  • .json
  • .log
  • .m3u
  • .m4a
  • .mdb
  • .mkv
  • .mod
  • .mov
  • .mp3
  • .mp4
  • .mpa
  • .msg
  • .mzv
  • .odp
  • .ods
  • .odt
  • .ost
  • .pdf
  • .png
  • .pps
  • .ppsm
  • .ppt
  • .pptx
  • .ps1
  • .psd1
  • .psm1
  • .pst
  • .py
  • .ram
  • .rar
  • .rtf
  • .sh
  • .sql
  • .sqlite
  • .svg
  • .tar
  • .tif
  • .tiff
  • .txt
  • .vdi
  • .vhd
  • .vmdk
  • .wav
  • .wmv
  • .xht
  • .xla
  • .xls
  • .xlsx
  • .xltm
  • .xml
  • .yaml
  • .yml
  • .zip

It does the following:

  • When not run with administrator privileges:
    • It will run another instance of itself with administrator privileges then exit.
  • It sends its generated victim ID, encryption key, and initialization vector to its C&C server.

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • C:\
  • %Desktop%
  • %User Profile%\Documents
  • %User Profile%\Downloads
  • %User Profile%\Music
  • %User Profile%\Pictures
  • %User Profile%\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).)

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

  • .raz

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

  • {Traversed Directory}\README.txt

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.572.02
FIRST VSAPI PATTERN DATE: 05 Sep 2024
VSAPI OPR PATTERN File: 19.573.00
VSAPI OPR PATTERN Date: 06 Sep 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:

     
    • Ransom.Win32.TRX.XXPE50FFF084

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

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 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.
  • {Traversed Directory}\README.txt

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.RAZR.THIODBD. 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.


Did this description help? Tell us how we did.