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Trojan.Win32.GULOADER.UVFTNA

November 25, 2022
 Analysis by: Khristian Joseph Morales
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It terminates itself if it detects it is being run in a virtual environment.

  TECHNICAL DETAILS

File Size:

256,64 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

16 Nov 2022

Arrival Details

This Trojan 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 drops the following files:

  • %User Temp%\ns{random}.tmp
  • %User Temp%\ns{random}.tmp\System.dll

(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 System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Skandskriftets
Harmoniorkestres = {Hex values}

HKEY_CURRENT_USER\Software\Mytilacean
Optagers = {Hex values}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Greyback\Minerology
Virkelighedssans = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Termiske\Metalarbejder\Sawmills\
Skovslottenes
Rmebrttets = 1

Other Details

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Skandskriftets

HKEY_CURRENT_USER\Software\Mytilacean

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Greyback

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Termiske

HKEY_CURRENT_USER\Software\litoter

It terminates itself if it detects it is being run in a virtual environment.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.950.03

FIRST VSAPI PATTERN DATE:

21 Nov 2022

VSAPI OPR PATTERN File:

17.951.00

VSAPI OPR PATTERN Date:

22 Nov 2022

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

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\Skandskriftets
    • Harmoniorkestres = {Hex values}
  • In HKEY_CURRENT_USER\Software\Mytilacean
    • Optagers = {Hex values}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Greyback\Minerology
    • Virkelighedssans = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Termiske\Metalarbejder\Sawmills\Skovslottenes
    • Rmebrttets = 1

Step 4

Delete this registry key

[ 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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • HKEY_CURRENT_USER\Software\Skandskriftets
  • HKEY_CURRENT_USER\Software\Mytilacean
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Greyback
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Termiske
  • HKEY_CURRENT_USER\Software\litoter

Step 5

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.
  • %User Temp%\ns{random}.tmp
  • %User Temp%\ns{random}.tmp\System.dll

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.GULOADER.UVFTNA. 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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