TrojanSpy.Win32.FPSPY.THICOBD
Worm.Win32.Boychi (IKARUS)
Windows
Threat Type: Trojan Spy
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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
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
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
Step 5
Delete this registry value
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
- Office = %System%\rundll32.exe %AppDataLocal%\Microsoft\WPSOffice\sys.dll, MazeFunc %1
Step 6
Search and delete these files
- %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
- %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.
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