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Trojan.HTML.FUPORPLEX.NGTS

May 21, 2022
 Analysis by: Eleazar Valles
 ALIASES:

HTML/ExpKit.Gen2(ANTIVIR)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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

It checks the operating system name of the affected computer. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

92,016 bytes

File Type:

HTML, HTM

Memory Resident:

No

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan 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 Trojan adds the following processes:

  • powershell.exe -nop -exec bypass -EncodedCommand {Base64-encoded command}

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

  • Global\ifqGpTzdTzhMJSOz

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\7-zip
StayOnTop = 1

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://raw.{BLOCKED}k.xyz/SdTC8df7vmDNIUuV1.jpg
  • https://raw.{BLOCKED}k.xyz/1DHRBFPLZTEQRRBUB.jpg
  • https://rawcdn.{BLOCKED}k.com/yfaOp/BEFzQ/7d0f5914392dc9688c67a2118aefafc958cb53b2/1505132.jpg - if executed in 32-bit machine
  • https://rawcdn.{BLOCKED}k.com/yfaOp/BEFzQ/7d0f5914392dc9688c67a2118aefafc958cb53b2/1808132.jpg - if executed in 32-bit machine
  • https://rawcdn.{BLOCKED}k.com/yfaOp/BEFzQ/7d0f5914392dc9688c67a2118aefafc958cb53b2/1905864.jpg - if executed in 64-bit machine
  • https://rawcdn.{BLOCKED}k.com/yfaOp/BEFzQ/7d0f5914392dc9688c67a2118aefafc958cb53b2/1505164.jpg - if executed in 64-bit machine
  • https://rawcdn.{BLOCKED}k.com/yfaOp/BEFzQ/7d0f5914392dc9688c67a2118aefafc958cb53b2/1808164.jpg - if executed in 64-bit machine

Other Details

This Trojan checks the operating system name of the affected computer if it is any of the following:

  • Windows XP
  • Windows Vista
  • Windows 7

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.576.03

FIRST VSAPI PATTERN DATE:

20 May 2022

VSAPI OPR PATTERN File:

17.577.00

VSAPI OPR PATTERN Date:

21 May 2022

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\7-zip\
    • StayOnTop = 1

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.HTML.FUPORPLEX.NGTS. 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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