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Ransom.HTML.KRYPTERADE.A.note

April 20, 2023
 Analysis by: Charles Adrian Marty
 ALIASES:

JS:Trojan.Cryxos.2574 (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Others

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

This Others arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be dropped by other malware.

This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

File Size:

33,135 bytes

File Type:

HTML, HTM

Memory Resident:

No

Initial Samples Received Date:

20 Apr 2023

Payload:

Connects to URLs/IPs, Encrypts files

Arrival Details

This Others arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be dropped by the following malware:

  • KRYPTERADE ransomware family

Stolen Information

This Others sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}8.com/checkout.php?step=1

Other Details

This is the Trend Micro detection for:

  • Ransom note dropped by KRYPTERADE ransomware family.

It does the following:

  • It has an embedded javascript code that is used to do the following:
    • The following input are disabled in the HTML:
      • Drag
      • Select
      • Right-click
      • Ctrl+U
      • Ctrl+A
      • Ctrl+C
    • It accepts a 16-digit PIN code input (Paysafecard payment)
  • It displays the following note:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.396.04

FIRST VSAPI PATTERN DATE:

20 Apr 2023

VSAPI OPR PATTERN File:

18.397.00

VSAPI OPR PATTERN Date:

21 Apr 2023

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.HTML.KRYPTERADE.A.note. 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:


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