Downloader.Preft

Downloader.Preft is a heuristic detection name given by Symantec and Norton Anti-virus to identify a program or file that was verified to cause additional threat on the computer. Normally, this type of threat was built to install potentially unwanted program or download more malware onto the computer. Typically, Downloader.Preft causes medium to severe disturbance on the system. It makes changes on certain settings without asking for user’s approval.

Threat behavior

Installation

Downloader.Preft or any variants of this threat are normally spread through malicious programs. Compromised web sites running drive-by-download scripts also lead to the infection and serious damage on the PC.

Other means to deploy Downloader.Preft is through spam email campaign, malicious links from social media sites, and file-sharing networks. Be aware also on key generators and cracked program as it was repacked to include this threat on the installation process.

Payload

If Downloader.Preft was able to invade your computer, anticipate a sudden cut down on the speed of both the machine as well as Internet connection. The threat constantly connects to predefined server to further download malicious file. Changes will also be carried out on configuration settings, Internet browser, and security setup. Downloader.Preft is a clever malware that can end processes that belongs to anti-virus and firewall.

Symptoms

Downloader.Preft produces a bunch of annoyances when running on the system. This threat affects computer operation, Internet browsing, and even most of the programs that are installed. Some of Windows tools may also stop from responding and this includes registry editor, task manager, and file management.

How can you remove Downloader.Preft?

To totally remove Downloader.Preft from the computer and get rid of relevant viruses, please execute the procedures as stated on this page. Make sure that you have completely scan the system with suggested malware removal tools and virus scanners.

Execute the steps in exact order to ensure complete removal of Downloader.Preft. If you have locally installed anti-virus, you can also scan the computer with it. Just make sure to update first the security program to obtain the most recent database. In that way, the security application can properly identify all malicious files and objects that are infected with Downloader.Preft.

Instant Remover : Get rid of Downloader.Preft using Anti-malware Tool

1. Download Malwarebytes Anti-Malware from the link below. Save the file on your hard drive.

2. Once the download completes, double-click on the file MBSetup.exe to run the program.

3. Select desired installation package whether for Personal Computer or Work Computer.

4. On next window, click Install button to proceed.

MBAM Default Install

5. Just proceed with the succeeding prompts until it start to execute the installation procedure.

6. Installation process will take less than a minute. It should run automatically after completing the setup.

7. When Malwarebytes Anti-Malware interface appears, please select Scan on the menu. The program will check for any available update before proceeding. Do not skip this step. Virus scan may take a while, please wait for the process to finish.

MBAM-threatscan

8. When scanning is done, Malwarebytes Anti-Malware will display the list of identified threats. Remove all and restart the computer to finalized the scan process.

Infection of ransom virus is dangerous to the system because it can inject files that runs each time Windows starts. To prevent the malicious files from loading, Windows operating system must run with minimal process and it can be done through SafeMode With Networking.

If there is still sign of infection, you may proceed to a more complex removal guide below. Be sure to follow the steps in exact order to completely eliminate the threat.

Stage 1 : Start Windows in Safe Mode With Networking

Windows 8 Guide

1. Click Windows Start icon at the lower left section of the screen.

2. Open Search window and type Advanced in the field. It will open General PC Settings.

3. Click on Advanced Startup and then, click on Restart Now button.

4. Once the computer starts in Advanced Startup option menu, select Troubleshoot.

5. Next, click on Advanced Options to reveal the next section.

6. Click Startup settings and then, click Restart button to boot the PC in Startup Settings.

7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Windows 10 Guide

1. Click on Windows logo and select Power icon when options pop-ups.

2. Select Restart from the options while pressing Shift key on the keyboard.

3. Choose an Option window will appear, select the Troubleshoot button.

4. On next window, please choose Advanced Option.

5. On Advanced Option window, click on Startup Settings and then, click Restart button to reboot the computer.

6. When Windows boot on Startup Settings, press function key F5 or number 5 on keyboard.

Stage 2 :Scan with Norton Power Eraser

1. Download Norton Power Eraser from the link below. Save the file on your hard drive.

2. Once the download completes, double-click on the file NPE.EXE to run the program.

3. You will be prompted with End User License Agreement. Please click on Accept to continue.

4. Norton Power Eraser will check for the most recent version. Then, the main window will appear. Click on Scan for Risks to the scan and removal process for Downloader.Preft.

NPE-Main

5. By default, Norton Power Eraser was configured to perform rootkit scan. This is essential to get rid of Downloader.Preft or other relevant malware. To accomplish this, you will need to restart the computer. Please click Restart button.

NPE-Rootkit

6. After restarting Windows, the program will check for possible database update and then, proceeds with the scan. It may take a while, please wait for the scan process to complete.

NPE-Scanning

7. Once scanning is done, Norton Power Eraser will display a list of threats including Downloader.Preft. Review identified threats and remove/repair them from the PC by clicking on Fix Now button.

8. If you are prompted to restart the computer in order to complete the virus removal process, please click on Restart Now.

Stage 3 :Run Sophos Virus Remover to ensure that no more Downloader.Preft is left on the PC

1. Download Sophos Virus Removal Tool from the link below. Save the file to your Desktop so that we can access the file easily.

2. After downloading, navigate to the file location and double-click it. This will start the instllation procedure. User Account Control will prompt if you want to run the program, click Yes to continue.

3. On initial launch of the program, it will display a Welcome Screen as shown in the image below. Click Next to start the installation procedure.

sophos-welcome

4. Next, you need to accept the license agreement before Sophos Virus Removal Tool can be installed onto the computer. Choose 'I accept the terms in the license agreement'. Then, click Next button.

sophos-license

5. On the next prompts, please click appropriate button to proceed. At the end of the installation process, it will display InstallShield Wizard Completed. Just leave the Launch Sophos Virus Removal Tool with a check mark. Then, click Finish.

6. The tool will download necessary updates so Internet connection is required at this point. Lastly, Sophos Virus Removal Tool displays the welcome screen.

7. Click on Start Scanning button to begin checking the system for presence of rootkit and virus. The tool reveals items that were found linked to Downloader.Preft. It also detects and removes other malicious files.

sophos-startscan

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