Oct 11, 2014

Remove TrojanDownloader:Win32/Archost.A

You see a virus called TrojanDownloader:Win32/Archost.A on the antivirus program scan result? You spend a long time on removing the virus, but all you do is futile? It undermines the performance of your computer? You think you can use the antivirus program to delete it, but the antivirus program does not work? Do not know what to do?

Details of TrojanDownloader:Win32/Archost.A:

TrojanDownloader:Win32/Archost.A is a Trojan virus. Some free programs released by network criminals on the Internet contain this virus. Therefore, if you download one of those corrupted items, you’ll see it on the computer. Junk e-mail attachments and phishing websites may also contain the infection. You must be very careful when you attempt to use unknown online resources.

In the installation process, TrojanDownloader:Win32/Archost.A implants malicious files and registry entries to the target computer system. It is worth mentioning that the Trojan has the ability to change. Therefore, the names and locations of those files are also changing. More importantly, it also modifies the system settings, resulting in abnormal system status. You can also find that some files disappear completely from the computer. On the contrary, many unknown files appear without your permission. Computer is very slow in reaction. Some of your applications always stop working and even become invalid. It can shut down and restart your computer randomly. Thus, when you use the infected computer, you need to pay attention to save your data. In addition, it will open a remote channel in the infected computer for other viruses to penetrate into your computer. In other words, if the computer is infected with this Trojan horse for a period of time, the computer will continue to suffer from more other viruses. What is worse, cyber criminals have the ability to take over the infected computer to steal your valuable information, such as bank account details and email password. Hence, you should have it removed timely. However, many computer users may not know how to handle it, because most antivirus programs do not seem to be able to get rid of it. In this case, manual removal is the best method.

Processing manual removal is supposed to have a certain level of computer literacy. If you are not sure how to start and are afraid of making any critical mistakes damaging the computer system, please live chat with YooCare Expert now.

What Can the Vicious Virus Do?

1. It has the ability to download additional components and other infections in the target computer in order to fully complete its penetration.
2. It is able to cause system crash and destroy some of your programs in the infected computer.
3. It facilitates the virus makers to intrude your computer remotely without letting you know.
4. It is capable of collecting your browsing history and other private data.

Manual Removal Guide:

TrojanDownloader:Win32/Archost.A is an evil and dangerous threat. So far, there is not a perfect antivirus program which can eliminate the damn virus completely. The virus makers update it constantly so that it can escape antivirus programs. It reduces the performance of the infected computer significantly. Everything seems to be bad in the computer. The infected computer system will become quite unstable and lose the capacity to resist other malicious viruses. You need to remove the Trojan as early as possible so as to stop it from destroying the infected computer gradually.

1. End Relevant Processes

(1). Press Ctrl+Shift+Esc together to pop up Windows Task Manager, click Processes tab

Windows Task Manager

*For Win 8 Users:

Click More details when you see the Task Manager box

Win 8 Task Manager

And then click Details tab

Details Tab in Win 8 Task Manager

(2). Find out and end the processes of TrojanDownloader:Win32/Archost.A

2. Show Hidden Files

(1). Click on Start button and then on Control Panel

(2). Click on Appearance and Personalization

(3). Click on Folder Options

(4). Click on the View tab in the Folder Options window

(5). Choose Show hidden files, folders, and drives under the Hidden files and folders category

(6). Click OK at the bottom of the Folder Options window

*For Win 8 Users:

Press Win+E together to open Computer window, click View and then click Options

View in Computer Window

Click View tab in the Folder Options window, choose Show hidden files, folders, and drives under the Hidden files and folders category

View Tab in Folder Options Window

3. Delete Relevant Registry Entries and Files

(1). Delete the registry entries of TrojanDownloader:Win32/Archost.A through Registry Editor

Press Win+R to bring up the Run window, type “regedit” and click “OK”

While the Registry Editor is open, search and delete the related registry entries

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\[RANDOM CHARACTERS].exe

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run ‘Random’

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Random

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings “CertificateRevocation” =Random


(2). Find out and remove the associated files




%AllUsersProfile%\Application Data\random

%AllUsersProfile%\Application Data\~random

%AllUsersProfile%\Application Data\.dll HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Random “.exe”

Video Shows You How to Safely Modify Windows Registry Editor:

TrojanDownloader:Win32/Archost.A is a dangerous Trojan infection. It is hidden on the target computer. Once the computer is attacked by it, you often get some system error messages when you start and use the computer. It also reduces the performance of the infected computer to stop you from using a lot of applications. Cyber criminals who create the Trojan virus are able to control the computer and monitor your online activities in order to extract valuable data they need. The Trojan is so vicious that it will cause severe damages to the infected computer. Therefore, you should get rid of it from your computer as soon as possible.

The above manual removal is quite dangerous and complicated, which needs sufficient professional skills. Therefore, only computer users with rich computer knowledge are recommended to implement the process because any errors including deleting important system files and registry entries will crash your computer system. If you have no idea of how to process the manual removal, please contact experts from YooCare Online Tech Support for further assistance.

Published by & last updated on October 11, 2014 10:06 am

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