Analysis by: Raighen Sanchez
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size: 5,188 bytes
File Type: HTML, HTM
Memory Resident: No
Initial Samples Received Date: 11 Sep 2023
Payload: Collects system information, Downloads files

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:

  • %System%\conhost.exe %COMSpeC% ࿐ /V/D/c "mD C:\If1ZR8Y\>nul 2>&1 &&S^eT QFEU=C:\If1ZR8Y\^If1ZR8Y.^jS&&echo var IBUM='Hts+DHts+EHts+" → creates directory without any message

It creates the following folders:

  • C:\If1ZR8Y\ → after the execution of the malicious lnk file

Download Routine

This Trojan saves the files it downloads using the following names:

  • {Download path}\Webwhats42738348419.39330.zip

Information Theft

This Trojan gathers the following data:

  • GPU Information
  • System Language

Other Details

This Trojan does the following:

  • The downloaded zip file contains the following files:
    • Webwhats427383396.156333.12855.pdf.lnk → fileless attack
    • Webwhats427383396.156333.12855.jpg → backup of the .lnk file
  • If this Trojan runs in a Chrome browser, it will disable the following:
    • Security features in handling quarantined and / or suspicious files
    • Chrome Sandbox services
    • GPU Sandboxing
  • It adds itself as an entry to the browser's suggested site configuration.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.692.03
FIRST VSAPI PATTERN DATE: 12 Sep 2023
VSAPI OPR PATTERN File: 18.693.00
VSAPI OPR PATTERN Date: 13 Sep 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

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

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • C:\If1ZR8Y\

Step 4

Search and delete these files

[ 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.
  • {Download path}\Webwhats42738348419.39330.zip

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.HTML.WEBWHATS.A. 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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