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TrojanSpy.Win32.MARSTEALER.B

April 11, 2022
 Analysis by: Khristian Joseph Morales
 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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.

It executes then deletes itself afterward.

It gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size:

162,304 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

31 Mar 2022

Payload:

Connects to URLs/IPs

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 the following files:

  • {Malware Path}\{Stolen File} → Delete Afterwards
  • {Malware Path}\{8 random characters} → Delete Afterwards

It adds the following processes:

  • "%System%\cmd.exe" /c timeout /t 5 & del /f /q "{Malware Path\Malware Filename}" & exit

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It executes then deletes itself afterward.

Information Theft

This Trojan Spy gathers the following information on the affected computer:

  • Telegram session data
  • Discord session data
  • Browser data (e.g. cookies, downloads, history, credentials, autofills, credit card data)
    • Chrome
    • ChromeBeta
    • ChromeCanary
    • Chromium
    • Edge_Chromium
    • Kometa
    • Amigo
    • Torch
    • Orbitum
    • Comodo
    • Nichrome
    • Maxthon5
    • Sputnik
    • EPB
    • Vivaldi
    • CocCoc
    • Uran
    • QIP
    • Cent
    • Elements
    • TorBro
    • CryptoTab
    • Brave
    • Opera
    • OperaGX
    • OperaNeon
    • Firefo
    • SlimBrowser
    • PaleMoon
    • Waterfox
    • Cyberfox
    • BlackHawk
    • IceCat
    • KMeleo
  • Cryptocurrency Wallet data
    • Ethereum
    • Electrum
    • ElectrumLTC
    • Exodus
    • ElectronCash
    • MultiDoge
    • JAXX
    • Atomic
    • Binance
    • Coinomi
  • IP
  • Country
  • Working Path
  • Language
  • Keyboard layout
  • RAM information
  • Processor information
  • Video card information
  • Display Resolution
  • Computer name
  • Username
  • Domain name
  • Machine ID
  • GUID
  • Installed Software
  • Screenshot
  • Time executed
  • Device used
  • Operating System
  • It gather files based on its configuration file received from the C&C server.
    • *.txt
    • *.pdf
    • *.xss
    • *.seco
    • *.doc
    • *.zip
    • *.json
  • Mail client:
    • Thunderbird

Stolen Information

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

  • http://{BLOCKED}.{BLOCKED}.41.179/game.php

NOTES:

This Trojan Spy does the following:

  • It connects to the following URL to resolve its configuration:
    • http://{BLOCKED}.{BLOCKED}.41.179/game.php
  • It connects the following URL to download normal files in %ProgramData%:
    • http://{BLOCKED}.{BLOCKED}.41.179/request
      • freebl3.dll
      • mozglue.dll
      • msvcp140.dll
      • nss3.dll
      • softokn3.dll
      • vcruntime140.dll
  • It terminates itself if any of the locale identifiers is found:
    • Kazakh (Kazakhstan)
    • Russian (Russia)
    • Belarusian (Belarus)
    • Uzbek (Latin, Uzbekistan)
    • Azerbaijani (Cyrillic, Azerbaijan)
  • It terminates itself if any of the following computer name(s) are found in the affected system:
    • HAL9TH
      • If true, checks if username is
      • JohnDoe
  • It will terminate itself if the current date is greater than 04/07/2022

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.476.07

FIRST VSAPI PATTERN DATE:

31 Mar 2022

VSAPI OPR PATTERN File:

17.477.00

VSAPI OPR PATTERN Date:

01 Apr 2022

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.XXPE50FFF055

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.
  • {Malware Path}\{8 random characters}

Step 5

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.MARSTEALER.B. 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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