Downloader.Ertfor

If your computer is infected with Downloader.Ertfor, you may follow the procedure on this page to contain this threat. Remove the Trojan at once before it can further harm the system.

Downloader.Ertfor is a detection for a computer Trojan that when executed will download more threats from a remote location and execute them on the compromised system. This Trojan can also modify system settings and create its own registry entries to be able to run itself each time that user starts Windows. Trojan alone is harmful enough to cause troubles on the affected computer. When it fetches some more threats, it may bring major disaster to the system that can lead to overall system malfunction.

After executing the Trojan, it will drop malicious files under Temporary folder of Windows. Similar to any other threats, it also adds various registry entries so that Downloader.Ertfor will load when Windows starts.

Next, it will attempt to connect to predefined web address in order to perform the following tasks:

  • Download and encrypted file, encrypts it, and update the Trojan.
  • Download an encrypted file from a remote server, encrypts it and execute on the infected system.
  • Remove all cache it has created and remove no trace of it activities.
  • Modify Windows Hosts file to prevent user from visiting certain web sites.

Downloader.Ertfor usually spreads through spam operation conducted by its author. It is either in the form of email or Internet campaign. To be more specific, Downloader.Ertfor’s role is to fetch other malware that cannot be distributed over the said campaign.

Being small in size and able to evade antivirus detection, this Trojan can fit email attachment. Authors of this Trojan also embed the code into downloadable executable files that are hosted on unsafe file-sharing networks.

Damage Level: Medium

Systems Affected: Windows 9x, 2000, XP, Vista, Windows 7

How to Remove Downloader.Ertfor

Systematic procedures to get rid of the threat are presented on this section. Make sure to scan your computer with suggested tools and scanners.

NOTE: We suggest that you PRINT this guide. There are steps that we may have to restart the computer in order to successfully remove the threat.

Step 1 : Scan and remove Downloader.Ertfor with MalwareBytes Anti-Malware

This guide requires a tool called Malwarebytes' anti-malware. It is a free tool designed to eradicate various computer infections including Downloader.Ertfor. MBAM scanner and malware removal tool is distributed for free.

1. In order to completely remove Downloader.Ertfor, it is best to download and run the recommended tool. Please click the button below to begin download.

Download Tool

2. After downloading, double-click on the file to install the application. If you are using Windows Vista or higher version, right-click on the file and select 'Run as administrator' from the list.

3. When User Account Control prompts, please click Yes to proceed with the installation.

4. Follow the prompts and install as 'default' only. There are no changes needed during the installation process.

5. Before the installation procedure ends, MalwareBytes Anti-Malware will prompt if you want to launch the application. Please leave the check mark on Launch Malwarebytes Anti-Malware.

Launch MBAM

6. Lastly, click the Finish button.

7. Malwarebytes Anti-Malware will launch for the first time. It is necessary to proceed with database update.

8. Remove all media such as Memory Card, CD, DVD, and USB devices. Then, restart the computer.

Boot in Safe Mode on Windows XP, Windows Vista, and Windows 7 system
a) Before Windows begins to load, press F8 on your keyboard.
b) It will display the Advanced Boot Options menu. Select Safe Mode.

Start computer in Safe Mode using Windows 8 and Windows 10
a) Close any running programs on your computer.
b) Get ready to Start Windows. On your keyboard, Press and Hold Shift key and then, click on Restart button.
c) It will prompt you with options, please click on Troubleshoot icon.
d) Under Troubleshoot window, select Advanced Options.
e) On next window, click on Startup Settings icon.
f) Lastly, click on Restart button on subsequent window.
g) When Windows restarts, present startup options with numbers 1 - 9. Select "Enable Safe Mode with Networking" or number 5.

Startup Options

h) Windows will now boot on Safe Mode with Networking. Proceed with virus scan as the next step.

9. Once Windows is running on Safe Mode, find the icon of MalwareBytes Anti-Malware. Double-click to launch the program.

10. Choose Threat Scan on scanner's console to ensure that it thoroughly check the PC for any presence of Downloader.Ertfor and other forms of threats. Click the Start Scan button to begin.

MBAM Scan

11. Once the scan has completed, Malwarebytes Anti-Malware will issue a list of identified threats. Mark all threats and click on Remove Selected.

MBAM Scan Finish

12. If it prompts to restart the computer, please reboot Windows normally.

Step 2 : Run a scan with your anti-virus program/a>

1. Repeat the process of starting Windows in Safe Mode with Networking.
2. Open your antivirus program and download the most recent update. This method ensures that your antivirus program can detect even newer variants of Downloader.Ertfor.

Updating your antivirus software is a one-click process. Please refer to your software manual for complete instructions.

3. Once updating is finished, run a full system scan on the affected PC. After the scan, delete all infected items. If unable to clean or delete, better place the threat in quarantine.

Step 3: Run another test with online virus scanner

Another way to remove Downloader.Ertfor without the need to install additional antivirus software is to perform a thorough scan with free online virus scanner. It can be found on websites of legitimate antivirus and security provider.

1. Click the button below to proceed to the list of suggested Online Virus Scanner. Choose your desired provider. You can run each scan individually, one at a time, to ensure that all threats will be removed from the computer. This may require plug-ins, add-on or Activex object, please install if you want to proceed with scan.

Online Virus Scan

2. After completing the necessary download, your system is now ready to scan and remove Downloader.Ertfor and other kinds of threats.
3. Select an option in which you can thoroughly scan the computer to make sure that it will find and delete entirely all infections not detected on previous scan.
4. Remove or delete all detected items.
5. When scanning is finished, you may now restart the computer in normal mode.

Alternative Removal Procedures for Downloader.Ertfor

Option 1 : Use Windows System Restore to return Windows to previous state

During an infection, Downloader.Ertfor drops various files and registry entries. The threat intentionally hides system files by setting options in the registry. With these rigid changes, the best solution is to return Windows to previous working state is through System Restore.

To verify if System Restore is active on your computer, please follow the instructions below to access this feature.

How to Access System Restore on Windows XP, Windows Vista, and Windows 7

a) Go to Start Menu, then under 'Run' or 'Search Program and Files' field, type rstrui.
b) Then, press Enter on the keyboard to open System Restore Settings.

rstrui-win7

How to Open System Restore on Windows 8

a) Hover your mouse cursor to the lower left corner of the screen and wait for the Start icon to appear.
b) Right-click on the icon and select Run from the list. This will open a Run dialog box.
c) Type rstrui on the 'Open' field and click on OK to initiate the command.

rstrui-win8

If previous restore point is saved, you may proceed with Windows System Restore. Click here to see the full procedure.

Option 2 : Downloader.Ertfor manual uninstall guide

IMPORTANT! Manual removal of Downloader.Ertfor requires technical skills. Deleting system files and registry entries by mistake may result to total disability of Windows system. We advise you to perform a backup of registry before proceeding with this guide.

1. Kill any running process that belongs to Downloader.Ertfor.
- Press Ctrl+Alt+Del on your keyboard.
- When Windows Task Manager appears, look for Downloader.Ertfor files (refer to Technical Reference) and click End Process.

End Task

2. Delete all registry entries that belong to this malware.
- Press [Windows Key]+R on your keyboard.
- In the 'Open' dialog box, type regedit and press Enter. This will open registry editor.
- Find and delete registry entries as mentioned in Technical Reference section.
- Close registry editor. Changes made will be saved automatically.

Run Regedit

3. Scan the computer with antivirus program.
- Connect to Internet and open your antivirus software. Please update to obtain the latest database and necessary files.
- Restart the computer in Safe Mode.
- Just before Windows logo begins to load press F8 on your keyboard.
- On Windows Advanced Boot Options, select Safe Mode and press Enter.

4. Delete all files dropped by Downloader.Ertfor.
- While still in Safe Mode, search and delete malicious files. Please refer to 'Technical Reference'. Make sure that you execute 'End Task' first before deleting the file. Otherwise, the system will not let you perform this action.

FAQs

Is
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 170
Dangerous?

Yes,
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 172
can badly affect your computer and slow down its performance and usability.

Can I Remove
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 178
from my Computer?

Yes,
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 180
can be removed by downloading our recommended antivirus software and scanner.

How Easy is it to Remove
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 186
Virus?

Nearly all paid antivirus scanners and removal tools should help remove the
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 188
virus from your computer.

Once I remove
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 194
do I still need antivirus?

Yes, new viruses such as
Notice: Undefined variable: kword in /var/www/html/wp-content/themes/happenstance/s_trojan3.php on line 196
are created everyday and the only way to stay 100% protected is to use antivirus on your device.

Associated Files and Folders:Added Registry Entries:
Avatar

About Marco Mathew

Marco Mathew works as Windows Network administrator before establishing precisesecurity.com. Now, Marco is dedicating full-time to help computer users' fight viruses, malware, trojan, worms, adware, and potentially unwanted programs.

Leave a Comment

Your email address will not be published. Required fields are marked *