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TrojanSpy.MSIL.TOXICEYE.THCOGBC

January 23, 2024
 Analysis by: Melvin Jhun Palbusa
 ALIASES:

PWS:MSIL/AdamantiumTheif.GA!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan Spy 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:

114,176 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Mar 2023

Payload:

Connects to URLs/IPs, Steals information, Drops files

Arrival Details

This Trojan Spy 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 Spy drops a copy of itself in the following folders using different file names:

  • %System Root%\Users\ToxicEye\rat.exe

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It drops the following files:

  • %System Root%\Users\ToxicEye\Keylogs
  • %System Root%\Users\ToxicEye\autosteal.lock
  • %Temp File%\tmp4EC0.tmp.bat

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It adds the following processes:

  • Schtasks.exe /create /f /sc ONLOGON /RL HIGHEST /tn "Chrome update" /tr "%System Root%\Users\ToxicEye\rat.exe"
  • cmd.exe /C %Temp File%\tmp4EC0.tmp.bat & Del %Temp File%\tmp4EC0.tmp.bat

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

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

  • ADMIN:3736989d58fe9efccf446e282e522a7a

Information Theft

This Trojan Spy gathers the following data:

  • Desktop Screenshot
  • It gathers credentials from the following:
    • Browser(Credit Card, History Date, Bookmarks, Cookies):
      • Chrome
      • Chromium
      • Opera Stable
      • Brave-Browser
      • Amigo
      • Vivaldi
      • Orbitum
      • Atom
      • Kometa
      • Comodo Dragon
      • Torch
      • Comodo
      • Slimjet
      • 360Browser
      • Maxthon3
      • K-Melon
      • Sputnik
      • CocCoc
      • Nichrome
      • uCozMedia
      • Chromodo
      • YandexBrowser
    • Applications:
      • Filezilla
      • Telegram
      • Discord
      • Steam
  • Zip files containing all files and applications present on %Desktop%
  • Clipboard

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

Stolen Information

This Trojan Spy sends the gathered information via HTTP POST to the following URL:

  • https://{BLOCKED}egram.org/bot5981399083:AAEHnXdvbepNaf6NW5inPfw0j_A5k_d0F-o/sendDocument?chat_id=5564760978

Other Details

This Trojan Spy connects to the following URL(s) to check for an Internet connection:

  • Google.com
  • Api.telegram.com

It checks for the presence of the following process(es):

  • Taskmgr
  • Processhacker
  • Netstat
  • Netmon
  • Tcpview
  • Wireshark
  • Filemon
  • Regmon
  • Cain

It does the following:

  • Able to Elevate previlage to administrator
  • It terminates itself if any of the following are satisfied:
    • If the difference from the generated ticks are less than 10 seconds
    • If the following strings are found in the Win32_ComputerSystem manufacturer:
      • vmware
    • If the following strings are found in the Win32_ComputerSystem model:
      • VIRTUAL
      • VirtualBox
    • If the following strings are found in the video controller present on the machine:
      • Vmware
      • VBox

It checks if the following virtual machine or sandbox related module(s) is loaded in the affected system:

  • SbieDll.dll
  • SxIn.dll
  • Sf2.dll
  • snxhk.dll
  • cmdvrt32.dll

It adds the following scheduled tasks:

  • Task Name: Chrome Update
  • Trigger: At Log on of any user
  • Action: %System Root%\ToxicEye\rat.exe

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.298.04

FIRST VSAPI PATTERN DATE:

07 Mar 2023

VSAPI OPR PATTERN File:

18.299.00

VSAPI OPR PATTERN Date:

08 Mar 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:

     
    • TROJ.Win32.TRX.XXPE50FFF066

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 this file

[ 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.
  • %System Root%\Users\ToxicEye\Keylogs
  • %System Root%\Users\ToxicEye\autosteal.lock
  • %System Root%\Users\ToxicEye\rat.exe
  • %Temp File%\tmp4EC0.tmp.bat

Step 5

Restart in Safe Mode

[ Learn More ]

Step 6

Deleting Scheduled Tasks while in Safe Mode

  1. Still in safe mode, the following {Task Name}-{Task to be run} listed should be used in the steps identified below:
    • Task Name: Chrome update
    • Task to be run: %System Root%\Users\ToxicEye\rat.exe
  2. For Windows 7 and Server 2008 (R2) users, click Start>Computer.
    • For Windows 8, 8.1, 10, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
  3. In the Search Computer/This PC input box, type:
    • %System%\Tasks\{Task Name}
  4. Once located, select the file then press SHIFT+DELETE to delete it.
  5. Open Registry Editor. To do this:
    • For Windows 7 and Server 2008 (R2) users, click the Start button, type regedit in the Search input field, and press Enter.
    • For Windows 8, 8.1, 10, and Server 2012 (R2) users, right-click on the lower left corner of the screen, click Run, type regedit in the text box
  6. In the left panel of the Registry Editor window, double-click the following:
    • HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Schedule>TaskCache>Tree>{Task Name}
  7. Locate the created entry and take note of the registry value's data:
    • ID={Task Data}
  8. After taking note of the data, delete the registry key:
    • HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Schedule>TaskCache>Tree>{Task Name}
  9. In the left panel of the Registry Editor window, double-click the following:
    • HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Schedule>TaskCache>Tasks
  10. Still in the left panel, locate and delete the registry key with the same name as the located Task Data in step #6:
    • ={Task Data}
  11. Close Registry Editor.

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.MSIL.TOXICEYE.THCOGBC. 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 this Knowledge Base page for more information.


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