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Trojan.Agent HKU\S-1-5-21 Removal Guide

Trojan.Agent HKU\S-1-5-21 Overview

As the name suggest, Trojan.Agent HKU\S-1-5-21 belongs to the category of “Trojan.Agent”. This type of trojan is purposely designed to run within the system’s background and exploit its vulnerabilities. It silently drops malicious programs like Adware, Malware and PUPs to badly compromise the device. Usually, it penetrates the computer through visiting harmful websites, downloading spam e-mail attachments and updating programs from unverified links.
Once entered, Trojan.Agent HKU\S-1-5-21 virus may create security flaws in the system to open a backdoor for cyber criminals and enable them to reach the afflicted computer. It can gather private data including credit cards info, sign in data of users without the permission. Trojan.Agent HKU\S-1-5-21 also has the capacity to change the browser settings so that you will are afflicted by browser redirection as well as annoying undesired popups and advertisements at random. It is recommended to immediately delete all files and registries by Trojan.Agent HKU\S-1-5-21. And free your Pc from this harmful malware program.

Technical Details of Trojan.Agent HKU\S-1-5-21

Name Trojan.Agent HKU\S-1-5-21
Type Trojan
Risk level High
Description Trojan.Agent HKU\S-1-5-21 runs malicious codes on the computer to provide unauthorized access to cyber hackers.
Occurrence Freeware installation, Visiting suspicious websites, Browser Redirection and spam mail attachments.
Detection Tool

Download the Detection toolTo confirm attack of Trojan.Agent HKU\S-1-5-21 virus on your computer.

Other Destructive properties of Trojan.Agent HKU\S-1-5-21 virus:

  • Allows backdoor access and control: Trojan.Agent HKU\S-1-5-21 downloads and uploads malicious codes to allow backdoor access and handles the controls to hackers.
  • Connects to a remote server: Trojan.Agent HKU\S-1-5-21 connects to remote server.
  • Steal private data: Trojan.Agent HKU\S-1-5-21 installs keyloggers to record private and financial data.

Intrusive Method of Trojan.Agent HKU\S-1-5-21

  • Download Of Freeware, Shareware and drive-by-downloads from unknown sources.
  • Visiting malicious links like pornographic, torrents, suspicious pop-ups so on.
  • Opening spam e-mail attachments arrived from unverified person or source.
  • Peer-to-Peer Sharing of files, Playing online games, downloading pirated software, infected media devices.
  • Updating existing programs/applications from redirected links.

Typical Symptoms of Trojan.Agent HKU\S-1-5-21

  • Trojan.Agent HKU\S-1-5-21 inserts its malicious code into executable files on the infected system to execute automatically.
  • Trojan.Agent HKU\S-1-5-21 overrides crucial registry entries causing permanent damage.
  • Trojan.Agent HKU\S-1-5-21 modifies browser settings like Homepage, Search provider.
  • Trojan.Agent HKU\S-1-5-21 throws fake security alerts, pop-ups and warnings.
  • Trojan.Agent HKU\S-1-5-21 consumes all the available resources of the system making the performance dull.


Methods to remove Trojan.Agent HKU\S-1-5-21 from the computer

If you have Trojan.Agent HKU\S-1-5-21 virus dropped inside, then your computer might also be infected with other spyware and potentially unwanted programs. You can try removing those manually, but manual method may not help you out fully to remove all the threats as they can regenerate itself if a single program code remain inside. Also, manual method requires very much proficiency in registry and program details, ant single mistake can put you in big trouble. Your computer may even crash down in the middle. Thus, Security researchers and virus experts always recommend using powerful and effective anti-spyware scanner and protector tool to completely remove the spyware or other potentially unwanted software from the infected computer system or other device.

Automatic Trojan.Agent HKU\S-1-5-21 Removal solution

SpyHunter has got all the feature that can help to remove Trojan.Agent HKU\S-1-5-21 virus from the infected computer and also prevent the other threats to attack the device in future. Once SpyHunter starts to run in the background, it will keep up notified if any threat or PUP tries to enter. Another feature of SpyHunter is that, whenever you install any new program it will Trojan.Agent HKU\S-1-5-21 scan the program and if it is not from any trusted source, it will notify you. Thus you can choose yourself either to go through the next installation step or stop right there.

Scan for Trojan.Agent HKU\S-1-5-21 virus On the computer.

SpyHunter 4 Features

Spyhunter 4 Compact OS allows your computer system to boot without windows so removal of malware and other stubborn infections may be easy.
Spyhunter System Guards will identify and block any malicious processes in real-time. Besides it allow to take full control of all processes that run on your computer.Scanning-SpyHunter

Spyhunter Scan

The brand new advantage of the software is this feature providing the list of even the most malicious malware. After a complete and advanced system scan is conducted, the user can quickly have all system threats removed – even the ones which were not found by other anti-spyware programs.Spyware-HelpDesk

It is important to emphasize that the systems having Spyhunter installed are protected from all types of existing malware. The program traces and completely deletes adware, spyware, keyloggers, rootkits and other threats including trojans and worms. None of the malware is now able to steal your personal data and use it against you.

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  • Follow two easy steps to install MacKeeper.downloadscreen_9_2_en
  • Drag the MacKeeper icon from the Applications folder to your Dock.

mackeeper-system-scanMacKeeper will start a system scan on your MAC PC and will present the full report of the scan.

Manual Trojan.Agent HKU\S-1-5-21 Removal solution

Step:1 Remove suspicious and unwanted browser add-ons, toolbars and extensions:


IEMicrosoft Edge (Internet Explorer)

  • Click on the cogwheel icon in the top right corner of the browser
  • In the menu choose the Manage Add-ons
  • Select Toolbar and Extension tab.
  • Look for Trojan.Agent HKU\S-1-5-21 or other suspicious add-ons.
  • Click Disable button.


google-chromeGoogle Chrome

  • Launch Google Chrome.
  • In the address bar type chrome://settings/
  • Click on the Extensions tab
  • Find related Trojan.Agent HKU\S-1-5-21 or other suspicious extension and click the delete icon.
  • Reset Homepage and search engine.


mozilla-firefoxMozilla Firefox

  • Open Firefox
  • In the address bar type about:addons
  • Click Extensions tab.
  • Find related Trojan.Agent HKU\S-1-5-21 or other suspicious extension.
  • Click the Remove button.

Note: This can only remove the extensions and add-ons from the browsers. The complete removal means more than this. You must reset browser settings and re-launch all the browsers. It is recommended to use automatic Reset browser option from the SpyHunter strong antivirus tool.

Step:-2 Remove all associated files From Operating System

windows-xpWindows XP

  • Click Start
  • In the menu choose Control Panel
  • Choose Add / Remove Programs.
  • Find Trojan.Agent HKU\S-1-5-21 related files.
  • Click Remove button.


windows-7Windows 7 / Vista

  • Click Start and choose Control Panel.
  • Choose Programs and Features and Uninstall a program.
  • In the list of installed programs find files and programs associated to Trojan.Agent HKU\S-1-5-21
  • Click Uninstall button.


windows-8Windows 8 /8.1

  • Right click on the bottom left corner of the desktop screen
  • From the left menu choose Control Panel
  • Click Uninstall a program under Programs and Features.
  • Locate the files and programs associated with Trojan.Agent HKU\S-1-5-21 or other suspicious program.
  • Click Uninstall button.

Step:- 3 Remove all Registry Entries added by Trojan.Agent HKU\S-1-5-21

Trojan.Agent HKU\S-1-5-21 creates a folder under:

  • %ProgramFiles%\scsi manager\scsimgr.exe

It then creates the following files:

  • %ProgramFiles%\Trojan.Agent HKU\S-1-5-21 \icon.ico
  • %ProgramFiles%\Trojan.Agent HKU\S-1-5-21 \ Trojan.Agent HKU\S-1-5-21 .crx
  • %ProgramFiles%\Trojan.Agent HKU\S-1-5-21 \ Trojan.Agent HKU\S-1-5-21 .dll
  • %ProgramFiles%\Trojan.Agent HKU\S-1-5-21 \ Trojan.Agent HKU\S-1-5-21 .xpi
  • %ProgramFiles%\Trojan.Agent HKU\S-1-5-21 \ Trojan.Agent HKU\S-1-5-21 64.dll
  • %ProgramFiles%\Trojan.Agent HKU\S-1-5-21 \Uninst.exe
  • %SystemDrive%\ProgramData\Microsoft\RAC\StateData\RacWmiDataBookmarks.dat
  • %SystemDrive%\ProgramData\Microsoft\RAC\StateData\RacWmiEventData.dat
  • %AllUsersProfile%\Microsoft\RAC\StateData\RacWmiDataBookmarks.dat
  • %AllUsersProfile%\Microsoft\RAC\StateData\RacWmiEventData.dat

Next, Trojan.Agent HKU\S-1-5-21 creates the following registry entries:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{814664b0-d93b-4da6-9216-722c56179397}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{814664b0-d93b-4da6-9216-722c56179397}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Activation Technologies\AdminObject\Store\55c92734-d682-4d71-983e-d6ec3f16059f
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
  • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{814664b0-d93b-4da6-9216-722c56179397}
  • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Trojan.Agent HKU\S-1-5-21
  • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{814664b0-d93b-4da6-9216-722c56179397}

Perform the following steps to delete the associated Registry entries by Trojan.Agent HKU\S-1-5-21

  1. While in the desktop view, Press window’s icon and R.
  2. It will open the Run window and type “regedit”.
  3. It will open the Registry Editor window, Now you need to locate and delete all registry items associated to Trojan.Agent HKU\S-1-5-21 program.
  4. Go to File<Click Export
  5. Save the file in c:\ as regbackup. Click save.
  6. Go to Edit< find< Type Trojan.Agent HKU\S-1-5-21
  7. Press F3 to search.
  8. Once an item is found, read to make sure it is a link to that program.
  9. Press delete to remove it.
  10. Continue pressing F3 and deleting items pertaining to the program, until all the links are gone.

Warning: you must only choose and delete the values and their associated registry entries for Trojan.Agent HKU\S-1-5-21 , others should not be tampered, edited or deleted. At any point you think not comfortable with the manual process, stop it immediately and use Trojan.Agent HKU\S-1-5-21 Removal Tool for safe problem solution.

Step:-4 Reboot the Computer and Run the Anti-malware tool for Complete Removal of Trojan.Agent HKU\S-1-5-21

Now Reboot the computer and run the scanner to detect any threat or suspicious program remaining inside. If you are not satisfied with the results and still see the issues, We recommend using the automatic Trojan.Agent HKU\S-1-5-21 Removal Tool for complete removal.

Experts Guide To Prevent Future Attacks

The following steps will guide you to reduce the risk of infection further.

  • Scan all files with an Internet Security solution before transferring them to your system.
  • Only transfer files from a well known source.
  • Always read carefully the End User License agreement at Install time and cancel if other “programs” are being installed as part of the desired program.
  • When visiting a website, type the address directly into the browser rather than following a link.
  • Do not provide personal information to any unsolicited requests for information.
  • Don’t open attachments or click on Web links sent by someone you don’t know.
  • Keep web browser up to date and computer is configured securely.


Get back to..

Trojan.Agent HKU\S-1-5-21 Overview

Technical Details of Trojan.Agent HKU\S-1-5-21

Automatic Trojan.Agent HKU\S-1-5-21 Removal solution

Manual Trojan.Agent HKU\S-1-5-21 Removal solution

****For MAC users it is recommended to Download MACKEEPER-3 easy steps to clean your Mac!****

****For Windows users it is recommended to Download Spyhunter most trusted Anti-spyware ****

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