TrojanSpy.MSIL.XWORM.RGN

January 31, 2025
 Analysis by: John Rainier Navato
 ALIASES:

Backdoor.MSIL.XWorm.gen (VBA32)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet, Propagates via removable drives

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 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:

58,368 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 Jan 2025

Payload:

Connects to URLs/IPs, Collects system information, Downloads files, Hides files and processes, Launches DoS/DDoS attacks, Logs keystrokes

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

  • ff3SRBIN5xkUxioy

Backdoor Routine

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

  • pong - Sends a "pong" string to the C2
  • rec - Restarts the application
  • CLOSE - Closes the application
  • uninstall - Executes the uninstall commands
  • update - Executes the uninstall commands and the updated binary
  • DW - Executes a powershell script
  • FM - Executes a command from the C2 in memory
  • LN - Downloads a file from a URL and execute it.
  • Urlopen - Opens a URL through a browser
  • Urlhide - Creates a HTTP GET request
  • PCShutdown - Executes a shutdown command
  • PCRestart - Executes a restart command
  • PCLogoff - Executes a logoff command
  • RunShell - Executes a command
  • StartDDos - Initiates DDoS activities
  • StopDDos - Terminates DDoS activities
  • StartReport - Sends a list of running processes
  • StopReport - Terminates sending of running proccesses list
  • Xchat - Sends a "Xchat" string and the ID generated using system information
  • Hosts - Sends the drivers\etc\host file contents
  • Shosts - Modifies the contents of a file
  • DDos - Sends a "DDos" string to the C2
  • plugin - Decompresses and executes a plugin
  • savePlugin - Saves the decoded plugin to a registry then decompresses and executes it
  • RemovePlugins - Deletes the registry with plugin data
  • OfflineGet - Sends a "OfflineKeylogger Not Enabled" string to the C2
  • $Cap - Sends a screen capture

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

  • using TCP:
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.34:4444

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • using TCP:
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.34:4444

Information Theft

This Trojan Spy gathers the following data:

  • Processor count
  • Username
  • Computer name
  • OS version and architecture
  • Hard drive size of system drive
  • Malware's last modification date
  • If executed using the filename "USB.exe"
  • If executed with admin rights
  • Webcam availability
  • CPU Information
  • GPU Information
  • RAM Information
  • Antivirus product name

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.840.05

FIRST VSAPI PATTERN DATE:

15 Jan 2025

VSAPI OPR PATTERN File:

19.841.00

VSAPI OPR PATTERN Date:

16 Jan 2025

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.XXPE50FFF089

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

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.MSIL.XWORM.RGN. 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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