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TrojanSpy.Win32.RULTAZO.MJY

March 18, 2019
 Analysis by: Noel Anthony Llimos
 ALIASES:

Trojan.GenericKD.31783346 (BITDEFENDER)

 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:

Spammed via email, Downloaded from the Internet, Dropped by other malware


This Trojan Spy arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It 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 commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

545,792 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Mar 2019

Payload:

Steals information, Connects to URLs/IPs

Arrival Details

This Trojan Spy arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 and executes the following files:

  • %Application Data%\triliumapp.exe

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

Autostart Technique

This Trojan Spy adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
trilium = %Application Data%\triliumapp.exe -boot

Backdoor Routine

This Trojan Spy executes the following commands from a remote malicious user:

  • Execute Arbitrary Commands
  • Enable and Disable a Specific Malicious Function
  • Collect Host IP Info
  • Download File
  • Execute File
  • Delete File
  • Take Screenshot

It connects to the following websites to send and receive information:

  • http://www.{BLOCKED}jamie.ml/z{BLOCKED}nel/index.php

Information Theft

This Trojan Spy gathers the following data:

  • Installed Programs
  • Screenshots
  • Machine GUID
  • System Architecture
  • Screen Resolution
  • System Language
  • Time Zone and Current Computer Time
  • User Name
  • Computer Name
  • OS version
  • Running Processes
  • Credentials, Cookies and Autofill Data from the following browsers:
    • 360Browser
    • 7Star
    • Amigo
    • Brave
    • Bromium
    • CentBrowser
    • Chedot
    • Chromium
    • CocCoc
    • ComodoDragon
    • ElementsBrowser
    • Epic
    • GoBrowser
    • GoogleChrome
    • Internet Explorer
    • InternetMailRu
    • Kometa
    • Microsoft Edge
    • Mustang
    • Nichrome
    • Opera
    • Orbitum
    • QIPSurf
    • RockMelt
    • SaferBrowser
    • Sputnik
    • Suhba
    • Superbird
    • TorBro
    • Torch
    • Uran
    • Vivaldi
    • YandexBrowser
  • FTP and Email Client Credentials:
    • WinSCP
    • Outlook
    • Thunderbird
    • FileZilla
  • Bitcoin Wallets:
    • Ethereum
    • Electrum
    • Electrum-LTC
    • Jaxx
    • Exodus
    • MultiBitHD
  • Skype Chat History/Messages
  • Telegram Credentials
  • Steam Credentials and Game Data

Other Details

This Trojan Spy connects to the following URL(s) to get the affected system's IP address:

  • ip-api.com/json

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.874.01

FIRST VSAPI PATTERN DATE:

15 Mar 2019

VSAPI OPR PATTERN File:

14.875.00

VSAPI OPR PATTERN Date:

16 Mar 2019

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

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • trilium = %Application Data%\triliumapp.exe -boot

Step 5

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.  
  • %Application Data%\triliumapp.exe

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.RULTAZO.MJY. 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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