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TrojanSpy.MSIL.NEGASTEAL.RJAHSPL

May 02, 2023
 Analysis by: Kim Cyrus Folloso
 ALIASES:

Other:Malware-gen [Trj] (Avast)

 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:

1,359,396 bytes

File Type:

BAT

Memory Resident:

Yes

Payload:

Modifies system registry

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:

  • %Application Data%\{Malware filename}.bat -> copy of itself
  • {Malware Path}\{Malware filename}.bat.exe -> copy of powershell
  • %User Temp%\{8 Random characters}.{3 Random characters}.ps1
  • %User Temp%\{8 Random characters}.{3 Random characters}.psm1
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

(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).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • cmd.exe reg add HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce /f /v {Malware filename} /d "%Application Data%\{Malware Name}.bat"
  • cmd.exe attrib +s +h {Malware filename}.bat.exe
  • cmd.exe {Malware filename}.bat.exe -wIn 1 -enC {Base64 Encoded Powershell}
  • {Malware Path}\{Malware filename}.bat.exe "%System%\WindowsPowerShell\v1.0\powershell.exe" -ENC {Base64 Encoded Powershell}

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

Other System Modifications

This Trojan Spy deletes the following files:

  • %User Temp%\{8 Random characters}.{3 Random characters}.ps1
  • %User Temp%\{8 Random characters}.{3 Random characters}.psm1

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

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It adds the following folders:
    • %Application Data%\eubJfun
  • It adds the following registry entries for automatic execution every system startup:
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
      • eubJfun = %Application Data%\eubJfun\eubJfun.exe
  • Steal the following information:
    • Time
    • Username
    • Computername
    • OS Version
    • CPU Architecture
    • IP Address
    • RAM
    • Browsers Credentials:

      • Opera
      • Yandex
      • Iriduim
      • Chromium
      • 7Star
      • Torch
      • Cool Novo
      • Chrome Plus
      • Kometa
      • Amigo
      • Brave
      • CentBrowser
      • Chedot
      • Orbitum
      • Sputnik
      • Comodo Dragon
      • Vivaldi
      • Citrio
      • Chrome
      • Uran
      • Liebao
      • Elements Browser
      • Epic Privacy
      • Coccoc
      • Sleipnir
      • QIP Surf
      • Coowon
      • Edge Chromium
      • Edge
      • Firefox
      • SeaMonkey
      • BlackHawk
      • Cyberfox
      • K-Meleon
      • IceCat
      • PaleMoon
      • IceDragon
      • Waterfox
      • Flock
      • Internet Explorer
      • UC Browser
      • Safari for Windows
      • QQ Browser
      • Falkon
    • Email Clients:

      • Thundebird
      • Postbox
      • Outlook
      • Windows Mail App
      • The Bat!
      • Becky!
      • IncrediMail
      • Eudora
      • Claws Mail
      • Foxmail
      • Opera Mail
      • Pocomail
      • eM client
      • Mailbird
    • FTPs:

      • FileZilla
      • WinSCP
      • CoreFTP
      • FlashFXP
      • FTP Navigator
      • SmartFTP
      • WS_FTP
      • FTP Commander
      • FTP Commander Deluxe
      • FTP Getter
    • VPNs:

      • OpenVPN
      • NordVPN
      • Private Internet Access
    • Instant Messaging Applications

      • Discord
      • Trillian
      • Psi/Psi+
    • VNCs:

      • RealVNC
      • TightVNC
      • TigerVNC
      • UltraVNC
    • Others:

      • MySQL Workbench
      • Internet Download Manager
      • Jdownloader
    • Credentials from the following vaults:

      • Windows Secure Note
      • Windows Web Password Credentials
      • Windows Credential Picker Protector
      • Web Credentials
      • Windows Credentials
      • Windows Domain Certificate Credential
      • Windows Domain Password Credential
      • Windows Extended Credential
  • Send Stolen information to the following URL:
    • https://api.telegram.org/{BLOCKED}3632223:AAG5KHZDs7KWoaqTYx3lSyFlOdfD9vGegQo/sendDocument?chat_id={ChatID}
  • Connect to the following URL to retrieve affected system's IP address:
    • https://{BLOCKED}i.{BLOCKED}y.org

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.418.05

FIRST VSAPI PATTERN DATE:

01 May 2023

VSAPI OPR PATTERN File:

18.419.00

VSAPI OPR PATTERN Date:

02 May 2023

Step 1

Restart in Safe Mode

[ Learn More ]

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

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\RunOnce
    • {Malware Filename} = %Application Data%\{Malware Filename}.bat

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%\{Malware filename}.bat
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Step 6

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

Step 7

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