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Trojan.JS.ICEDID.YXDFQZ

August 22, 2023
 Analysis by: Francesca Villasanta
 ALIASES:

Trojan:Win32/Leonem (MICROSOFT); Trojan.GenericKD.67543466 (BITDEFENDER)

 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.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

816,814 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

03 Jul 2023

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:

  • If file is downloaded from URL1:
    • "%System%\rundll32.exe" %Application Data%\Microsoft\Windows\Templates\{6 Random Numbers}.dat,vcab /k snickers328
  • If file is downloaded from URL2:
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" rundll32 %Application Data%\Microsoft\Windows\Templates\{6 Random Numbers}.dat,vcab /k snickers328

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Download Routine

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

  • URL1: https://www.{BLOCKED}austrija.at/images/out/lim.php
    If unsuccessful, will download from the following URL instead:
    • URL2: https://{BLOCKED}icavirtual.org/wp-content/out/lim.php

  • URL1: https://{BLOCKED}o.us/wp-content/out/lim.php
    If unsuccessful, will download from the following URL instead:
    • URL2: https://{BLOCKED}b.net/wp-content/out/lim.php

It saves the files it downloads using the following names:

  • %Application Data%\Microsoft\Windows\Templates\{6 Random Numbers}.dat

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

  • It proceeds with its malicious routine if the following folder exists:
    • %ProgramData%\Microsoft\Windows
  • It uses "PindOS" as User-Agent for the download request.

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.515.00

FIRST VSAPI PATTERN DATE:

17 Jun 2023

VSAPI OPR PATTERN File:

18.515.00

VSAPI OPR PATTERN Date:

18 Jun 2023

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     Downloader.VBS.TRX.XXVBS82EFF041

Step 2

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 3

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 4

Search and delete files detected as Trojan.JS.ICEDID.YXDFQZ

[ 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.
  • %Application Data%\Microsoft\Windows\Templates\{6 Random Numbers}.dat

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.JS.ICEDID.YXDFQZ. 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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