Analysis by: Joshua John Bantayan
ALIASES:

Trojan:Win32/Masson.A!rfn (MICROSOFT); HEUR:Trojan.MSIL.PowerShell.gen (KASPERSKY)

 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, 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.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 258,792 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 16 Dec 2020
Payload: Connects to URLs/IPs, Drops files, Collects system information, Steals information

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 copies of itself into the affected system and executes them:

  • %User Startup%\{malware name}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

It adds the following processes:

  • "%System%\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath %User Startup%\{malware name}.exe" -Force
  • timeout 4

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Backdoor Routine

This Trojan Spy connects to the following websites to send and receive information:

  • http://{BLOCKED}in.com:443

Information Theft

This Trojan Spy gathers the following data:

  • Processor Information
  • UserName
  • ComputerName
  • OS Information
  • CPU Information
  • IP Address
  • Amount of memory
  • MAC Address
  • Motherboard Information
  • Credentials from:
    • 360 Browser
    • 7star Browser
    • Amigo
    • Apple Application
    • Becky!
    • BlackHawk
    • Brave
    • Cent
    • Chedot
    • Chrome Plus
    • Chromium
    • Citrio
    • ClawsMail
    • CocCoc
    • Comodo Dragon
    • Cool Novo
    • Coowon
    • CoreFTP
    • CyberFox
    • DynDNS
    • Elements
    • Epic Privacy
    • Eudora
    • Falkon
    • FileZilla
    • Firefox
    • FlashFXP
    • Flock
    • Foxmail
    • FTP Navigator
    • FTPCommander
    • FTPGetter
    • HTTP
    • IceCat
    • IceDragon
    • IMAP
    • IncrediMail
    • Internet Download Manager
    • Ipswitch
    • Iridium
    • jDownloader
    • K-Meleon
    • Kometa
    • Liebao
    • MailBird
    • Microsoft Edge
    • Microsoft Outlook
    • MySQL
    • NordVPN
    • Novo
    • OpenVPN
    • Opera Browser
    • Opera Mail
    • Orbitum
    • PaleMoon
    • Paltalk
    • Pidgin
    • Pocomail
    • POP3
    • Postbox
    • Psi/Psi+
    • QIP Surf
    • QQ Browser
    • RealVNC
    • RimArts
    • Safari
    • Sea Monkey
    • Sleipnir 6
    • SmartFTP
    • SMTP
    • Sputnik
    • sqlite
    • SRWare Iron
    • Tencent
    • The Bat!
    • Thunderbird
    • TigerVNC
    • TightVNC
    • Torch
    • Trillian
    • UCBrowser
    • uCozMedia
    • UltraVNC
    • Uran
    • Vitalwerks
    • Vivaldi
    • WaterFox
    • Web Credentials
    • Windows Credential Picker Protector
    • Windows Credentials
    • Windows Domain Certificate Credential
    • Windows Domain Password Credential
    • Windows Extended Credential
    • Windows Secure Note
    • Windows Web Password Credential
    • WinSCP
    • WinSCP 2
    • WinVNC
    • WS_FTP
    • Yandex

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.412.03
FIRST VSAPI PATTERN DATE: 14 Dec 2020
VSAPI OPR PATTERN File: 16.413.00
VSAPI OPR PATTERN Date: 15 Dec 2020

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.XXPE50FFF039

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

Restart in Safe Mode

[ Learn More ]

Step 5

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.
  • %User Startup%\{malware name}.exe

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.MSIL.NEGASTEAL.DYSHPF. 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.

Step 7

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.MSIL.NEGASTEAL.DYSHPF. 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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