arrow_back
search
close

PUA.Win32.WallpaperHD.AC

January 15, 2020
 ALIASES:

RDN/Generic.fdl (McAfee)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size:

8,006,777 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Jan 2020

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 adds the following processes:

  • "%AppDataLocal%\WallpaperSuite\uninstall.exe" /S _?=%AppDataLocal%\WallpaperSuite
  • "%AppDataLocal%\WallpaperSuite\WallpaperSuite.exe" /install "{malware file path and name}"
  • "%AppDataLocal%\WallpaperSuite\WallpaperSuiteHelper64.exe" /install

(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:

  • %System Root%\Users
  • %User Profile%\AppData
  • %AppDataLocal%\WallpaperSuite
  • %AppDataLocal%\WallpaperSuite\Wallpapers

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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 Potentially Unwanted Application adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
WallpaperSuite = "%AppDataLocal%\WallpaperSuite\WallpaperSuite.exe /regrun"

Other System Modifications

This Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
WallpaperSuite

HKEY_CURRENT_USER\Control Panel\Desktop\
LocalPersonalization

HKEY_CURRENT_USER\Software\Classes\
CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}

HKEY_CURRENT_USER\Software\Classes\
CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\InprocServer32

HKEY_CLASSES_ROOT\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\
Implemented Categories

HKEY_CLASSES_ROOT\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\
Implemented Categories\{00021492-0000-0000-C000-000000000046}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
WallpaperSuite
DisplayName = "WallpaperSuite"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
WallpaperSuite
UninstallString = "%AppDataLocal%\WallpaperSuite\uninstall.exe /S"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
WallpaperSuite
Publisher = "WallpaperSuite"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
WallpaperSuite
DisplayVersion = "1.0.0.1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
WallpaperSuite
DisplayIcon = "%AppDataLocal%\WallpaperSuite\WallpaperSuite.exe"

HKEY_CURRENT_USER\Control Panel\Desktop\
LocalPersonalization
Application = "1"

HKEY_CURRENT_USER\Software\Classes\
CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}
(Default) = "Wallpaper"

HKEY_CURRENT_USER\Software\Classes\
CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\InprocServer32
(Default) = "%AppDataLocal%\WallpaperSuite\WallpaperSuiteLib64.dll"

HKEY_CURRENT_USER\Software\Classes\
CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\InprocServer32
ThreadingModel = "Apartment"

Dropping Routine

This Potentially Unwanted Application drops the following files:

  • %AppDataLocal%\WallpaperSuite\Wallpapers\1210.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1250.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1280.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1270.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1200.jpg
  • %AppDataLocal%\WallpaperSuite\WallpaperSuiteLib.dll
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1240.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1260.jpg
  • %AppDataLocal%\WallpaperSuite\WallpaperSuiteLib64.dll
  • %AppDataLocal%\WallpaperSuite\uninstall.exe
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1290.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1220.jpg
  • %AppDataLocal%\WallpaperSuite\WallpaperSuiteHelper64.exe
  • %AppDataLocal%\WallpaperSuite\WallpaperSuite.exe
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1230.jpg

(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).)

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

  • http://www.{BLOCKED}-analytics.com
  • http://appwallsuite.{BLOCKED}ebsites.net

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

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

Restart in Safe Mode

[ Learn More ]

Step 3

Identify and terminate files detected as PUA.Win32.WallpaperHD.AC

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • WallpaperSuite
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • LocalPersonalization
  • In HKEY_CURRENT_USER\Software\Classes\CLSID
    • {F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}
  • In HKEY_CURRENT_USER\Software\Classes\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}
    • InprocServer32
  • In HKEY_CLASSES_ROOT\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}
    • Implemented Categories
  • In HKEY_CLASSES_ROOT\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\Implemented Categories
    • {00021492-0000-0000-C000-000000000046}

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • WallpaperSuite = "%AppDataLocal%\WallpaperSuite\WallpaperSuite.exe /regrun"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\WallpaperSuite
    • DisplayName = "WallpaperSuite"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\WallpaperSuite
    • UninstallString = "%AppDataLocal%\WallpaperSuite\uninstall.exe /S"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\WallpaperSuite
    • Publisher = "WallpaperSuite"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\WallpaperSuite
    • DisplayVersion = "1.0.0.1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\WallpaperSuite
    • DisplayIcon = "%AppDataLocal%\WallpaperSuite\WallpaperSuite.exe"
  • In HKEY_CURRENT_USER\Control Panel\Desktop\LocalPersonalization
    • Application = "1"
  • In HKEY_CURRENT_USER\Software\Classes\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}
    • (Default) = "Wallpaper"
  • In HKEY_CURRENT_USER\Software\Classes\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\InprocServer32
    • (Default) = "%AppDataLocal%\WallpaperSuite\WallpaperSuiteLib64.dll"
  • In HKEY_CURRENT_USER\Software\Classes\CLSID\{F7B8E2CA-97DF-4974-BDF1-3D93EDC93A5E}\InprocServer32
    • ThreadingModel = "Apartment"

Step 6

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1210.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1250.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1280.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1270.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1200.jpg
  • %AppDataLocal%\WallpaperSuite\WallpaperSuiteLib.dll
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1240.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1260.jpg
  • %AppDataLocal%\WallpaperSuite\WallpaperSuiteLib64.dll
  • %AppDataLocal%\WallpaperSuite\uninstall.exe
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1290.jpg
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1220.jpg
  • %AppDataLocal%\WallpaperSuite\WallpaperSuiteHelper64.exe
  • %AppDataLocal%\WallpaperSuite\WallpaperSuite.exe
  • %AppDataLocal%\WallpaperSuite\Wallpapers\1230.jpg

Step 7

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\Users
  • %User Profile%\AppData
  • %AppDataLocal%\WallpaperSuite
  • %AppDataLocal%\WallpaperSuite\Wallpapers

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as PUA.Win32.WallpaperHD.AC. 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.


Did this description help? Tell us how we did.