Trojan.Win32.GULOADER.UVFTNA
Windows
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
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
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
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}
- Harmoniorkestres = {Hex values}
- In HKEY_CURRENT_USER\Software\Mytilacean
- Optagers = {Hex values}
- Optagers = {Hex values}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Greyback\Minerology
- Virkelighedssans = 1
- Virkelighedssans = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Termiske\Metalarbejder\Sawmills\Skovslottenes
- Rmebrttets = 1
- Rmebrttets = 1
Step 4
Delete this registry key
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
- %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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