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Updated: December 13, 2017 5:20:56 PM
Type: Potentially Unwanted App
Infection Length: Varies
Name: Knight System Protector
Version: 5.4.3 (a)
Publisher: KnightSystemProtector
Risk Impact: Low
Systems Affected: Windows


PUA.KnightSysProtect is a potentially unwanted application that gives misleading information about issues on the computer. It then asks the user to pay to fix the issues.

Antivirus Protection Dates

  • Initial Rapid Release version December 11, 2017 revision 024
  • Latest Rapid Release version December 12, 2017 revision 002
  • Initial Daily Certified version December 12, 2017 revision 006
  • Latest Daily Certified version December 12, 2017 revision 006
  • Initial Weekly Certified release date December 13, 2017

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Technical Description

Once executed, the application creates the following folders:

  • %ProgramFiles%\Knight System Protector
  • %ProgramFiles%\Knight System Protector\Logs
  • %SystemDrive%\ProgramData\Microsoft\Windows\Start Menu\Programs\Knight System Protector
  • %AllUsersProfile%\Administrator\AppData\Roaming\Knight System Protector
  • %AllUsersProfile%\Administrator\AppData\Roaming\Knight System Protector\Data
  • %AllUsersProfile%\Administrator\Desktop\test_knight
  • %AllUsersProfile%\All Users\Microsoft\Windows\Start Menu\Programs\Knight System Protector

The application creates the following files:
  • %ProgramFiles%\Common Files\microsoft shared\VC\msdia100.dll
  • %ProgramFiles%\Knight System Protector\Engine.dll
  • %ProgramFiles%\Knight System Protector\EngineEx.dll
  • %ProgramFiles%\Knight System Protector\eSellerateControl365.dll
  • %ProgramFiles%\Knight System Protector\eSellerateEngine.dll
  • %ProgramFiles%\Knight System Protector\eWebClient.dll
  • %ProgramFiles%\Knight System Protector\eWebControl365.dll
  • %ProgramFiles%\Knight System Protector\Ignore.ini
  • %ProgramFiles%\Knight System Protector\Knight System Protector.ini
  • %ProgramFiles%\Knight System Protector\KnightSystemProtector.exe
  • %ProgramFiles%\Knight System Protector\Languages.ini
  • %ProgramFiles%\Knight System Protector\Logs\43075.7260322106.txt
  • %ProgramFiles%\Knight System Protector\Logs\43075.7391275694.txt
  • %ProgramFiles%\Knight System Protector\unins000.dat
  • %ProgramFiles%\Knight System Protector\unins000.exe
  • %SystemDrive%\ProgramData\Microsoft\Windows\Start Menu\Programs\Knight System Protector\Knight System Protector.lnk

The application then creates the following registry subkeys:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASAPI32
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASMANCS
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1

Next, the application creates the following registry entries:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASAPI32\"EnableFileTracing" = "0"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASAPI32\"EnableConsoleTracing" = "0"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASAPI32\"FileTracingMask" = "FFFF0000"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASAPI32\"ConsoleTracingMask" = "FFFF0000"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASAPI32\"MaxFileSize" = "100000"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASAPI32\"FileDirectory" = ""%windir%\tracing"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASMANCS\"EnableFileTracing" = "0"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASMANCS\"EnableConsoleTracing" = "0"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASMANCS\"FileTracingMask" = "FFFF0000"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASMANCS\"ConsoleTracingMask" = "FFFF0000"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASMANCS\"MaxFileSize" = "100000"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\KnightSystemProtector_RASMANCS\"FileDirectory" = ""%windir%\tracing"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"Inno Setup: Setup Version" = "5.4.3 (a)"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"Inno Setup: App Path" = "%ProgramFiles%\Knight System Protector"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"InstallLocation" = "%ProgramFiles%\Knight System Protector\"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"Inno Setup: Icon Group" = "Knight System Protector"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"Inno Setup: User" = "Administrator"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"Inno Setup: Language" = "default"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"DisplayName" = "Knight System Protector version 3.0"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"UninstallString" = ""%ProgramFiles%\Knight System Protector\unins000.exe""
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"QuietUninstallString" = ""%ProgramFiles%\Knight System Protector\unins000.exe" /SILENT"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"NoModify" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"NoRepair" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"InstallDate" = "20171206"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Knight System Protector_is1\"EstimatedSize" = "4054
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{44EEAD9B-4EB1-4236-83BC-1273BB4B01EF}\InprocServer32\"" = "%ProgramFiles%\Knight System Protector\eWebClient.dll"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6C9CA10D-E604-47FB-A2F9-C9A013193609}\InProcServer32\"" = "%ProgramFiles%\Knight System Protector\eWebClient.dll"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{892F787F-B650-4A3E-AA5B-2B8021CE4D0A}\InprocServer32\"" = "%ProgramFiles%\Knight System Protector\eWebControl365.dll"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A0B0E5AB-617C-4A7D-8A94-9937D24B6670}\InprocServer32\"" = "%ProgramFiles%\Knight System Protector\eWebControl365.dll"

The application performs a scan and displays misleading information about issues on the computer.

The application then asks the user to pay in order to fix the listed issues.


You may have arrived at this page either because you have been alerted by your Symantec product about this risk, or you are concerned that your computer has been affected by this risk.

Before proceeding further we recommend that you run a full system scan . If that does not resolve the problem you can try one of the options available below.

If you are a Norton product user, we recommend you try the following resources to remove this risk.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resources provide further information and best practices to help reduce the risk of infection.

If you are a Symantec business product user, we recommend you try the following resources to remove this risk.

Identifying and submitting suspect files
Submitting suspicious files to Symantec allows us to ensure that our protection capabilities keep up with the ever-changing threat landscape. Submitted files are analyzed by Symantec Security Response and, where necessary, updated definitions are immediately distributed through LiveUpdate™ to all Symantec end points. This ensures that other computers nearby are protected from attack. The following resources may help in identifying suspicious files for submission to Symantec.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resource provides further information and best practices to help reduce the risk of infection.
Protecting your business network

The following instructions pertain to all current Symantec antivirus products.

1. Performing a full system scan
How to run a full system scan using your Symantec product

2. Restoring settings in the registry
Many risks make modifications to the registry, which could impact the functionality or performance of the compromised computer. While many of these modifications can be restored through various Windows components, it may be necessary to edit the registry. See in the Technical Details of this writeup for information about which registry keys were created or modified. Delete registry subkeys and entries created by the risk and return all modified registry entries to their previous values.