Analysis by: Leidryn Saludez
ALIASES:

Trojan-Ransom.FileCrypter (IKARUS)

 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.

  TECHNICAL DETAILS

File Size: 9,256 bytes
File Type: PHP
Memory Resident: No
Initial Samples Received Date: 03 Apr 2025
Payload: Encrypts files, Connects to URLs/IPs

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 connects to the following possibly malicious URL:

  • https://{BLOCKED}in.com/xfsaxi82

Ransomware Routine

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

  • .htaccess
  • .FS
  • Dragon_Readme.html
  • Readme.html
  • rans

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

  • .FS

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

  • {Encrypted Directory}\Dragon_Readme.html → ransom note content is retrieved from a Pastebin URL

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.120.02
FIRST VSAPI PATTERN DATE: 03 Apr 2025
VSAPI OPR PATTERN File: 20.121.00
VSAPI OPR PATTERN Date: 04 Apr 2025

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

Scan your computer with your Trend Micro product to delete files detected as Ransom.PHP.DRAKONLOCK.THDOCBE. 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 3

Restore encrypted files from backup.


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