arrow_back
search
close

TrojanSpy.Win32.FPSPY.THICOBD

November 04, 2024
 Analysis by: John Rainier Navato
 ALIASES:

Worm.Win32.Boychi (IKARUS)

 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:

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 gathers certain information on the affected computer. It logs a user's keystrokes to steal information.

It creates an event.

  TECHNICAL DETAILS

File Size:

1,915,392 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 Sep 2024

Payload:

Collects system information, Connects to URLs/IPs, Steals information, Drops files, 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:

  • %AppDataLocal%\Microsoft\WPSOffice\sys.dll
  • %AppDataLocal%\Microsoft\WPSOffice\Klog.txt → Contains Stolen Information
  • %AppDataLocal%\Microsoft\WPSOffice\Param.ini → Contains Configuration
  • %AppDataLocal%\Microsoft\WPSOffice\exe.dat → Encrypted %AppDataLocal%\Microsoft\WPSOffice\dwn.dat
  • %AppDataLocal%\Microsoft\WPSOffice\dwn.dat

(Note: %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:

  • %System%\rundll32.exe %AppDataLocal%\Microsoft\WPSOffice\sys.dll, MazeFunc %1

(Note: %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 creates the following folders:

  • %AppDataLocal%\Microsoft\WPSOffice

(Note: %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).)

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
Office = %System%\rundll32.exe %AppData Local%\Microsoft\WPSOffice\sys.dll, MazeFunc %1

Information Theft

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

  • IP Address
  • Clipboard Data
  • Keystrokes
  • Mouse Clicks
  • Username
  • Computer Name

It logs a user's keystrokes to steal information.

Stolen Information

This Trojan Spy saves the stolen information in the following file:

  • %AppData Local%\Microsoft\WPSOffice\Klog.txt

It sends the gathered information via HTTP POST to the following URL:

  • {BLOCKED}er2024.000webhostapp.com/Maze/upload.php

    However, as of this writing, the said site is inaccessible.

Other Details

This Trojan Spy does the following:

  • It can terminate processes by process ID found from its configuration file.

It creates the following event(s):

  • TrojanEvent

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.622.03

FIRST VSAPI PATTERN DATE:

30 Sep 2024

VSAPI OPR PATTERN File:

19.623.00

VSAPI OPR PATTERN Date:

01 Oct 2024

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.XXPE50FFF087

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

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
    • Office = %System%\rundll32.exe %AppDataLocal%\Microsoft\WPSOffice\sys.dll, MazeFunc %1

Step 6

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.
  • %AppDataLocal%\Microsoft\WPSOffice\sys.dll
  • %AppDataLocal%\Microsoft\WPSOffice\Klog.txt
  • %AppDataLocal%\Microsoft\WPSOffice\Param.ini
  • %AppDataLocal%\Microsoft\WPSOffice\exe.dat
  • %AppDataLocal%\Microsoft\WPSOffice\dwn.dat

Step 7

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %AppDataLocal%\Microsoft\WPSOffice

Step 8

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


Did this description help? Tell us how we did.