PUA.Win32.Adload.AI

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

File Size: 14,495,128 bytes

File Type: EXE

Memory Resident: Yes

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application drops the following files:

%User Temp%\main.ini
%Application Data%\DataRecovery\api-ms-win-core-console-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-datetime-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-debug-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-errorhandling-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-file-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-file-l1-2-0.dll
%Application Data%\DataRecovery\api-ms-win-core-file-l2-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-handle-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-heap-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-interlocked-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-libraryloader-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-localization-l1-2-0.dll
%Application Data%\DataRecovery\api-ms-win-core-memory-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-namedpipe-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-processenvironment-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-processthreads-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-processthreads-l1-1-1.dll
%Application Data%\DataRecovery\api-ms-win-core-profile-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-rtlsupport-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-string-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-synch-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-synch-l1-2-0.dll
%Application Data%\DataRecovery\api-ms-win-core-sysinfo-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-timezone-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-core-util-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-conio-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-convert-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-environment-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-filesystem-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-heap-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-locale-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-math-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-multibyte-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-private-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-process-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-runtime-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-stdio-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-string-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-time-l1-1-0.dll
%Application Data%\DataRecovery\api-ms-win-crt-utility-l1-1-0.dll
%Application Data%\DataRecovery\Aspose.Words.dll
%Application Data%\DataRecovery\Common.lcc
%Application Data%\DataRecovery\DataPreview.exe
%Application Data%\DataRecovery\dnhfzj.dll
%Application Data%\DataRecovery\dnhfzj64.dll
%Application Data%\DataRecovery\dnhfzjctrl.exe
%Application Data%\DataRecovery\dnhfzjsvr.exe
%Application Data%\DataRecovery\DuiLib.dll
%Application Data%\DataRecovery\FreeImage.dll
%Application Data%\DataRecovery\libcommon.dll
%Application Data%\DataRecovery\main.ini
%Application Data%\DataRecovery\MaskRoate.png
%Application Data%\DataRecovery\msvcp140.dll
%Application Data%\DataRecovery\OpenWordDll.dll
%Application Data%\DataRecovery\Refresh.png
%Application Data%\DataRecovery\System.Runtime.InteropServices.RuntimeInformation.dll
%Application Data%\DataRecovery\Thumbs.db
%Application Data%\DataRecovery\Uninst.exe
%Application Data%\DataRecovery\vcruntime140.dll
%Application Data%\DataRecovery\wDataRecovery.exe
%Application Data%\Microsoft\Windows\Start Menu\Programs\DataRecovery\DataRecovery.lnk
%Application Data%\Microsoft\Windows\Start Menu\Programs\DataRecovery\Uninstall.lnk
%Desktop%\DataRecovery.lnk
%User Temp%\com{random digits}.dlcc
Added after uninstallation through ControlPanel/running %Application Data%\DataRecovery\Uninst.exe:
- %User Temp%\Uninst.exe
- %User Temp%\dnhfzj.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).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

%Application Data%\DataRecovery\dnhfzjsvr.exe -install
%Application Data%\DataRecovery\dnhfzjctrl.exe regdll=%Application Data%\DataRecovery\dnhfzj.dll
%System%\regsvr32.exe /s "%Application Data%\DataRecovery\dnhfzj.dll"
%Application Data%\DataRecovery\wDataRecovery.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

This Potentially Unwanted Application registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr
Description = Data Recovery File Stream Control Serve

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr
DisplayName = Data Recovery File Stream Control Server

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr
ImagePath = %Application Data%\DataRecovery\dnhfzjsvr.exe

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr
ObjectName = LocalSystem

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr
Type = 272

Other System Modifications

This Potentially Unwanted Application adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\App Paths\
wDataRecovery.exe
(Default) = %Application Data%\DataRecovery\wDataRecovery.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wDataRecovery
DisplayName = wDataRecovery

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wDataRecovery
UninstallString = %Application Data%\DataRecovery\uninst.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wDataRecovery
DisplayIcon = %Application Data%\DataRecovery\wDataRecovery.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wDataRecovery
DisplayVersion = 2.0.0.1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wDataRecovery
Publisher = ShangHai Yingshuang

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
(Default) = dnhfzj

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\InprocServer32
(Default) = %Application Data%\DataRecovery\dnhfzj.dll

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\InprocServer32
ThreadingModel = Apartment

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
Title = Data Recovery

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
Path = %Application Data%\DataRecovery\wDataRecovery.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
Custom =

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
ShowIcon = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
Dynamic = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
Maxtext = 25

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
*\shellex\ContextMenuHandlers\
dnhfzj
(Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Directory\shellex\ContextMenuHandlers\
dnhfzj
(Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
ShellIconOverlayIdentifiers\dnhfzj
(Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}

Other Details

This Potentially Unwanted Application adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\{ControlSet001 or CurrentControlSet}\
services\dnhfzjsvr

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\App Paths\
wDataRecovery.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wDataRecovery

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
*\shellex\ContextMenuHandlers\
dnhfzj

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Directory\shellex\ContextMenuHandlers\
dnhfzj

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
ShellIconOverlayIdentifiers\dnhfzj

It connects to the following possibly malicious URL:

http://softlog.tw{BLOCKED}.cn/api/data/sync
http://i.tw{BLOCKED}.cn/api/pure/get

Minimum Scan Engine: 9.800

SSAPI PATTERN File: 2.451.00

SSAPI PATTERN Date: 07 Oct 2021

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.XXPE50FFF049

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

Remove PUA.Win32.Adload.AI by using its own Uninstall option

[ Learn More ]

To uninstall the grayware process

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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
- (Default) = dnhfzj
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\InprocServer32
- (Default) = %Application Data%\DataRecovery\dnhfzj.dll
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\InprocServer32
- ThreadingModel = Apartment
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
- Title = Data Recovery
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
- Path = %Application Data%\DataRecovery\wDataRecovery.exe
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
- Custom =
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
- ShowIcon = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
- Dynamic = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
- Maxtext = 25
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers\dnhfzj
- (Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers\dnhfzj
- (Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\dnhfzj
- (Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}

To delete the registry value this malware created:

Open Registry Editor. To do this:
» For Windows 7 and Windows Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, 10, and Windows Server 2012 (R2) users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter.
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
In the right panel, locate and delete the entry:
(Default) = dnhfzj
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}>InprocServer32
In the right panel, locate and delete the entry:
(Default) = %Application Data%\DataRecovery\dnhfzj.dll
Again In the right panel, locate and delete the entry:
ThreadingModel = Apartment
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}>Settings
In the right panel, locate and delete the entry:
Title = Data Recovery
Again In the right panel, locate and delete the entry:
Path = %Application Data%\DataRecovery\wDataRecovery.exe
Again In the right panel, locate and delete the entry:
Custom =
Again In the right panel, locate and delete the entry:
ShowIcon = 1
Again In the right panel, locate and delete the entry:
Dynamic = 1
Again In the right panel, locate and delete the entry:
Maxtext = 25
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>*>shellex>ContextMenuHandlers>dnhfzj
In the right panel, locate and delete the entry:
(Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Directory>shellex>ContextMenuHandlers>dnhfzj
In the right panel, locate and delete the entry:
(Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer>ShellIconOverlayIdentifiers>dnhfzj
In the right panel, locate and delete the entry:
(Default) = {BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
Close Registry Editor.

Step 6

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.

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\InprocServer32
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{BF73DE8F-608F-479F-ACE5-01199DBCB6B0}\Settings
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers\dnhfzj
In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shellex\ContextMenuHandlers\dnhfzj
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\dnhfzj

Step 7

Search and delete this file

[ 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%\Uninst.exe
%User Temp%\main.ini
%User Temp%\dnhfzj.dll
%User Temp%\com{random digits}.dlcc

Step 8

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.Adload.AI. 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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