Analysis by: Raymart Christian Yambot
 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: 121659452 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 10 Dec 2024
Payload: 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:

  • %Windows%\WallpapersFired
  • %Windows%\JoshuaId
  • %Windows%\ManufacturedFunctionality
  • %Windows%\RevealInspiration
  • %Windows%\EducationWebsites
  • %User Temp%\AppData\Local\Temp\Respected
  • %User Temp%\AppData\Local\Temp\Air
  • %User Temp%\AppData\Local\Temp\Mart
  • %User Temp%\AppData\Local\Temp\Excuse
  • %User Temp%\AppData\Local\Temp\Keywords
  • %User Temp%\AppData\Local\Temp\Garage
  • %User Temp%\AppData\Local\Temp\Signatures
  • %User Temp%\AppData\Local\Temp\Chris
  • %User Temp%\AppData\Local\Temp\County
  • %User Temp%\AppData\Local\Temp\Thriller
  • %User Temp%\AppData\Local\Temp\Seating
  • %User Temp%\AppData\Local\Temp\Decreased
  • %User Temp%\AppData\Local\Temp\Universal
  • %User Temp%\AppData\Local\Temp\Heel
  • %User Temp%\AppData\Local\Temp\Decreased.cmd
  • %User Temp%\AppData\Local\Temp\407059\Brazilian.com
  • %User Temp%\407059\U

It adds the following processes:

  • "%System%\cmd.exe" /c copy Decreased Decreased.cmd && Decreased.cmd
  • findstr /I "wrsa opssvc"
  • tasklist
  • findstr "AvastUI AVGUI bdservicehost nsWscSvc ekrn SophosHealth"
  • cmd /c md 407059
  • findstr /V "JournalAddingCalifSufficientlyUiDollLetsSuppose" Heel
  • cmd /c copy /b ..\Air + ..\Seating + ..\Universal + ..\Excuse + ..\Respected + ..\Chris + ..\Signatures + ..\Thriller + ..\County U
  • Brazilian.com U
  • choice /d y /t 5

Other System Modifications

This Trojan Spy modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap
UNCAsIntranet = 0

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap
AutoDetect = 1

(Note: The default value data of the said registry entry is 0.)

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.772.08
FIRST VSAPI PATTERN DATE: 12 Dec 2024
VSAPI OPR PATTERN File: 19.773.00
VSAPI OPR PATTERN Date: 13 Dec 2024

Step 1

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 2

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 3

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
  • UNCAsIntranet = 0
  • UNCAsIntranet = 1
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
  • AutoDetect = 1
  • AutoDetect = 0

Step 4

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.
  • %Windows%\WallpapersFired
  • %Windows%\JoshuaId
  • %Windows%\ManufacturedFunctionality
  • %Windows%\RevealInspiration
  • %Windows%\EducationWebsites
  • %User Temp%\AppData\Local\Temp\Respected
  • %User Temp%\AppData\Local\Temp\Air
  • %User Temp%\AppData\Local\Temp\Mart
  • %User Temp%\AppData\Local\Temp\Excuse
  • %User Temp%\AppData\Local\Temp\Keywords
  • %User Temp%\AppData\Local\Temp\Garage
  • %User Temp%\AppData\Local\Temp\Signatures
  • %User Temp%\AppData\Local\Temp\Chris
  • %User Temp%\AppData\Local\Temp\County
  • %User Temp%\AppData\Local\Temp\Thriller
  • %User Temp%\AppData\Local\Temp\Seating
  • %User Temp%\AppData\Local\Temp\Decreased
  • %User Temp%\AppData\Local\Temp\Universal
  • %User Temp%\AppData\Local\Temp\Heel
  • %User Temp%\AppData\Local\Temp\Decreased.cmd
  • %User Temp%\AppData\Local\Temp\407059\Brazilian.com
  • %User Temp%\407059\U

Step 5

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.LUMMASTEALER.KJO. 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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