How to Remove Trojan Horse Crypt5.efx Virus?

Hi there. I’m having a lot of trouble removing a Trojan that’s slowing down my laptop. I ran a scan with AVG free 2015 earlier and then I received notification that AVG detected Trojan Horse Crypt5.efx. So I chose the “Remove” option which is recommended and then it told me “Access is Denied”. I cannot get rid of the virus. The alert keeps popping up every few minutes. It is really frustrating! Any help will be highly appreciated.

Learn More About Trojan Horse Crypt5.efx:

Trojan Horse Crypt5.efx is categorized as malicious Trojan horse infection that starts automatically whenever system starts up. This virus is designed by cyber hackers with evil purposes, mostly to destroy your computer system and hack your financial account. It can get into your PC via many ways. Most of time, it comes bundled with shareware or other downloadable software. Another method of distributing Trojan Horse Crypt5.efx virus involves tricking you by displaying deceptive pop-up ads that may appear as regular Windows notifications with links which look like buttons reading Yes and No. No matter which “button” that you click on, a download starts, installing this nasty Trojan on your system. The virus also can be attached to spam emails. Once you open it accidentally, the virus will start performing harmful actions on your PC. They include:

1. Create junk files and corrupted files to take up a plenty of computer resources and CPU memories.
2. Slow down system performance and cause application crash problem.
3. Change browser settings to present you endless ads, and cause annoying browser redirection.
4. Open backdoor to invite other infections like Adware, Browser Hijacker and Rogue Programs.
5. Disable firewall and bypass the detection of most anti-virus programs.
6. Monitor your Internet browsing activities and collect your privacy and personal information such as password, credit card information etc.

Trojan Horse Crypt5.efx is a bad Trojan virus focused on stealing money and collecting confidential information from the vulnerable PCs so people should get rid of it without any hesitation. Once your PC is attacked by this virus, it takes much longer than usual to start up the system. It weakens the PC performance and could bring more and more viruses to attack the computers. Furthermore, the virus can attack your programs and damage your system files, so you will find your computer is running weirdly and some programs are not able to run any more. Sometimes your PC may restart or shutdown itself unreasonably. Consequently, Trojan Horse Crypt5.efx virus is a dangerous threat that wreaks chaos on your PC and it should be removed as soon as possible to ensure your machine is running in safe network environment.

The following instructions require certain levels of computer skills. If you’re not sure how to delete this nasty Trojan, please live chat with YooCare experts now.

Major characteristics of this nasty Trojan include:

Slow down your PC speed notably.
Add other dangerous Trojan or Spyware to your system secretly.
Allow the hacker to access your entire system.
Collect all your personal information and transfer to a remote hacker.
Destroy critical system files and make PC unstable.

How Does This Virus Get On Your Computer?

From malicious drive-by-download scripts from corrupted porn and shareware / freeware websites.
Through spam email attachments, media downloads and social networks.
When clicking suspicious pop-ups or malicious links.
Open unknown email or download media files that contain the activation code of the virus.

Note: No matter how the virus accesses your PC, users should know that there are no tools can remove this pesky Trojan automatically at this moment, it is suggested users not spend much time in downloading or paying any security software which claims can delete this stubborn virus. It is totally useless. To completely get rid of Trojan Horse Crypt5.efx Virus, professional manual guide is needed.

About Trojan Virus Removal:

Currently many computer users had the same experience that this virus couldn’t be removed by any anti-virus applications. So the manual approach is always required to combat this virus. And here is the step-by-step removal guide for all computer users.

1. End the malicious process from Task Manager.

Once Trojan Horse Crypt5.efx virus is installed, computer user may notice that CPU usage randomly jumps to 100 percent. At any time Windows always has many running processes. A process is an individual task that the computer runs. In general, the more processes, the more work the computer has to do and the slower it will run. If your system’s CPU spike is constant and remain at a constant 90-95%, users should check from Task Manager and see if there is a suspicious process occupying system resources and then end it immediately.

(The name of the virus process can be random.)

Press Ctrl+Shift+Esc to quickly bring up Task Manager Window:

task manager

2. Show hidden files and folders.

Open Folder Options by clicking the Start button, clicking Control Panel, clicking Appearance and Personalization, and then clicking Folder Options.

Click the View tab.

Under Advanced settings, click Show hidden files and folders, uncheck Hide protected operating system files (Recommended) and then click OK.

Folder Options

3. Open Registry entries. Find out the malicious files and entries and then delete all.

Attention: Always be sure to back up your PC before making any changes.

a. Press Windows key + R to open Run box. In the “Open” field, type “regedit” and click the “OK” button.


Then a Registry Editor window will pop up as the following picture shows:

registry editor

b. Search malicious files and registry entries and then remove all of them:

%AllUsersProfile%\Application Data\.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\[random]
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Temp

Video Shows You How to Safely Modify Windows Registry Editor:

Trojan Horse Crypt5.efx is a highly dangerous virus that belongs to the Trojan horse family which has been recognized as the most devastating group in the virus history. Upon execution, it badly damages your computer system and compromises your privacy and security. This virus may sneak into your system through the attachment of spam emails, via the download of freeware or shareware, or even by your unaware clicks on malicious codes and unknown websites. It not only alters your system settings and corrupts files, but also opens a backdoor for intended hackers who will be able to control your computer and steal your important information such as private data and banking details. Although the virus can be easily detected by AVG, it could hardly be actually killed by most famous anti-virus programs. You will get error messages again and again to prevent the removal going on. Therefore, it is suggested PC users delete Trojan Horse Crypt5.efx virus manually instead.

Note: If you are not knowledgeable enough to be able to distinguish the location of this virus, or you are afraid of making mistake during the manual removal, please contact experts from Yoocare Online Tech Support for further help.

Published by on October 30, 2015 1:08 am, last updated on October 30, 2015 1:08 am

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