Analysis by: Leidryn Saludez

ALIASES:

Trojan.GenericKD.76331429 (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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

  TECHNICAL DETAILS

File Size: 6,700 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 02 Jun 2025
Payload: Collects system information, Connects to URLs/IPs, Modifies system registry

Arrival Details

This Backdoor 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 Backdoor adds the following processes:

  • cmd.exe /s /c "powershell -c if ([Security.Principal.WindowsIdentity]::GetCurrent().Name -match \'(?i)SYSTEM\') { \'Runas: System\' } elseif (([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) { \'Runas: Admin\' } else { \'Runas: User\' }"
  • "powershell.exe" tasklist /svc
  • "powershell.exe" Get-Service | Select-Object -Property Name, DisplayName | Format-List
  • "powershell.exe" Get-PSDrive -PSProvider FileSystem | Format-Table

Autostart Technique

This Backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ChromeUpdater = /t REG_SZ /d

Backdoor Routine

This Backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}e-forecasts-pale-scored.trycloudflare.com
  • {BLOCKED}g-cartridges-watts-flags.trycloudflare.com
  • {BLOCKED}gators-boxing-trademark-threatened.trycloudflare.com
  • {BLOCKED}hillips-princess-baker.trycloudflare.com
  • {BLOCKED}g-advisors-older-invitations.trycloudflare.com
  • {BLOCKED}ment-parliamentary-chairs-hc.trycloudflare.com
  • {BLOCKED}.{BLOCKED}.{BLOCKED}.181
  • {BLOCKED}.{BLOCKED}.{BLOCKED}.182
  • {BLOCKED}.{BLOCKED}.{BLOCKED}.41

Information Theft

This Backdoor gathers the following data:

  • Full System Information
  • Active services (Get-Service, tasklist /svc)
  • Drive configuration (Get-PSDrive)
  • ARP cache

Other Details

This Backdoor does the following:

  • It contacts URLs on either port 80 (HTTP) or 443 (HTTPS), sending system profile data and receiving command payloads, retrieved via HTTP POST to /init1234 endpoint
  • Last byte of buffer determines the file type of incoming payloads. Helps in deciding how the file should be executed.
    • 0 → EXE [.exe] Runs the binary directly
    • 1 → DLL [.dll] Uses rundll32.exe
    • 2 → JS [.js] Executes it inline with Node.js via -e
    • 3 → OTHER [.log]
  • The execution is silent, detached from the parent, and hidden from the user interface.

It accepts the following parameters:

  • -e → the embedded code is extracted and stored for reuse
  • {no parameter} → Relaunches itself in detached mode

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.328.04
FIRST VSAPI PATTERN DATE: 15 Jul 2025
VSAPI OPR PATTERN File: 20.329.00
VSAPI OPR PATTERN Date: 16 Jul 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

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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • ChromeUpdater = /t REG_SZ /d

Step 4

Scan your computer with your Trend Micro product to delete files detected as Backdoor.JS.NODESNAKE.THFOBBE. 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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