Analysis by: Neljorn Nathaniel Aguas

ALIASES:

Virus.MSIL.Tufantle, Virus.MSIL.Tufantle (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size: 480,768 bytes
File Type: EXE
Initial Samples Received Date: 06 Nov 2024
Payload: Drops 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 folders:

  • If -o | --output parameter is used:
    • {Path Set by the User}\EyeWitness_{Date}_{Time}
    • {Path Set by the User}\EyeWitness_{Date}_{Time}\headers
    • {Path Set by the User}\EyeWitness_{Date}_{Time}\images
    • {Path Set by the User}\EyeWitness_{Date}_{Time}\src

    Otherwise:
    • %Application Data%\EyeWitness_{Date}_{Time}
    • %Application Data%\EyeWitness_{Date}_{Time}\headers
    • %Application Data%\EyeWitness_{Date}_{Time}\images
    • %Application Data%\EyeWitness_{Date}_{Time}\src

(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).)

It drops the following files:

  • If -o | --output parameter is used:
    • {Path Set by the User}\EyeWitness_{Date}_{Time}\headers\{URL Accessed}.txt → contains the HTTP response headers from the captured webpage
    • {Path Set by the User}\EyeWitness_{Date}_{Time}\images\{URL Accessed}.bmp → contains screenshot of the webpage as rendered by EyeWitness
    • {Path Set by the User}\EyeWitness_{Date}_{Time}\src\{URL Accessed}.txt → contains the full HTML, JavaScript, and CSS source code of the webpage
    • {Path Set by the User}\EyeWitness_{Date}_{Time}\report_page1.html → contains the generated report, showing details of the web request, HTTP headers, source code, and a screenshot of the captured webpage

    Otherwise:
    • %Application Data%\EyeWitness_{Date}_{Time}\headers\{URL Accessed}.txt
    • %Application Data%\EyeWitness_{Date}_{Time}\images\{URL Accessed}.bmp
    • %Application Data%\EyeWitness_{Date}_{Time}\src\{URL Accessed}.txt
    • %Application Data%\EyeWitness_{Date}_{Time}\report_page1.html

  • It compresses the above files into the following if -c | --compress parameter is used:
    • {Path Set by the User}\EyeWitness_{Date}_{Time}.zip or
    • %Application Data%\EyeWitness_{Date}_{Time}.zip

(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).)

Other Details

This Trojan does the following:

  • It captures screenshots of web pages, analyzing HTTP responses, and generating reports for reconnaissance and security assessments.
  • It uses the following version of EyeWitness:
    • EyeWitness v1.1

It accepts the following parameters:

  • -b | --bookmarks → Searches for bookmark files for IE/Chrome, parses them, and adds them to the list of screenshot URLs
  • -f | --file → Specify a new-line separated file of URLs
  • -i | --cidr → Specify an IP CIDR
  • -o | --output → Specify an output directory (one will be created if non-existent)
  • -d | --delay → (Default: 30) Specify a delay to use before cancelling a single URL request
  • -c | --compress → (Default: false) Compress output directory
  • --http → (Default: false) Prepend http:// to all URLs
  • --https → (Default: false) Prepend https:// to all URLs
  • --help → Display this help screen.
  • --version → Display version information.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.711.00
FIRST VSAPI PATTERN DATE: 11 Nov 2024
VSAPI OPR PATTERN File: 19.711.00
VSAPI OPR PATTERN Date: 12 Nov 2024

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:

    • Troj.Win32.TRX.XXPE50FFF086

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 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.
  • {Path Set by the User}\EyeWitness_{Date}_{Time}\headers\{URL Accessed}.txt
  • {Path Set by the User}\EyeWitness_{Date}_{Time}\images\{URL Accessed}.bmp
  • {Path Set by the User}\EyeWitness_{Date}_{Time}\src\{URL Accessed}.txt
  • {Path Set by the User}\EyeWitness_{Date}_{Time}\report_page1.html

    or

  • %Application Data%\EyeWitness_{Date}_{Time}\headers\{URL Accessed}.txt
  • %Application Data%\EyeWitness_{Date}_{Time}\images\{URL Accessed}.bmp
  • %Application Data%\EyeWitness_{Date}_{Time}\src\{URL Accessed}.txt
  • %Application Data%\EyeWitness_{Date}_{Time}\report_page1.html

    or

  • {Path Set by the User}\EyeWitness_{Date}_{Time}.zip or
  • %Application Data%\EyeWitness_{Date}_{Time}.zip

Step 5

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.
  • {Path Set by the User}\EyeWitness_{Date}_{Time}\src
  • {Path Set by the User}\EyeWitness_{Date}_{Time}\images
  • {Path Set by the User}\EyeWitness_{Date}_{Time}\headers
  • {Path Set by the User}\EyeWitness_{Date}_{Time}

    or

  • %Application Data%\EyeWitness_{Date}_{Time}\src
  • %Application Data%\EyeWitness_{Date}_{Time}\images
  • %Application Data%\EyeWitness_{Date}_{Time}\headers
  • %Application Data%\EyeWitness_{Date}_{Time}

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.MSIL.FRS.VSNW0BK24. 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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