By | October 8, 2012 | 2 Comments

Gen:Trojan.Heur.FU is a generic detection for a Trojan that is a member of huge group. There are many variants of this threat. Each can individually performs own payload once installed on the computer. Gen:Trojan.Heur.FU variants are made to download additional harmful code from specific server. It can also allow an attacker to gain access on the infected computer.

Gen:Trojan.Heur.FU and a number of close allies may spread via email attachment. It usually disguises or comprises PDF on its name. Once the attached file is opened, Gen:Trojan.Heur.FU instantly drops malicious file and create a number of registry entries. Then, it connects to another computer and downloads more malware.

Type Trojan
Sub-Type Downloader
OS Affected Windows XP, Windows Vista, Windows 7

What are the Symptoms of Gen:Trojan.Heur.FU Infection?

It arrives as an attached file to spam email messages containing malicius PDF file. Here is the sample email that contains Gen:Trojan.Heur.FU virus.


The Trojan commits no visual system changes. Only visible signs of the infection are constant alert coming from an antivirus program. Since this is a generic detection, security software may provide various names such as the following:


Follow these Procedures to Remove Gen:Trojan.Heur.FU

Procedure 1: Start Computer in Safe Mode

Restart your computer in Safe Mode with Networking

- Turn on the computer and immediately press F8 on the keyboard to enter Windows Advanced Options screen. Make sure to hit the F8 button before Windows logo appears on the screen. Failure to do this will boot Windows normally. If that happens, please repeat the process until you successfully boot into Windows Advanced Options. Please see image below for reference.

- From the selections, choose Safe Mode with Networking. Please use keyboard's arrow up/down to navigate between selections and press Enter to proceed.Safe mode loads minimal driver and processes, thus, there is no chance that Gen:Trojan.Heur.FU will run during this mode.

SafeMode Networking

Procedure 2: Scan and remove Gen:Trojan.Heur.FU files and process with MalwareBytes Anti-Malware

To remove Gen:Trojan.Heur.FU, download Malwarebytes Anti-Malware by clicking on the button below. This tool is effective in getting rid of Trojans, viruses and malware.

Download Gen:Trojan.Heur.FU Removal Tool

1. After downloading, please install the program using the default settings.
2. At the end of the installation, please make sure that it will download necessary updates.
3. Once update has completed. The tool will launch.
4. Thoroughly scan the computer and remove all threats detected by this anti-malware program.

Double-check for bits and pieces of Gen:Trojan.Heur.FU using Microsoft Safety Scanner

MS Safety Scanner is a free security tool that offers on-demand virus scanning and helps remove threats from the infected computer. It is a stand-alone program that works even with existing antivirus program.

Important: Each download of Microsoft Safety Scanner expires 10 days after the acquisition date. If this period lapses, you need to download the same program from the same location again. New download contains newer virus definition and database to detect and clean most recent viruses.

To use this tool in removing Gen:Trojan.Heur.FU, please follow this procedure.

1. Download Microsoft Safety Scanner from official web site. Click on the button below.

Download MS Safety Scanner Button

2. Save the file to a convenient location such as Desktop.
3. Once the download completes, browse the folder and double-click on the file msert.exe. Icon for this file looks like this.

MS Safety Scanner Icon

4. If Windows prompts for a security warning and ask if you want to run the file, click on Run. For Windows Vista/7 users, you may right-click on the file and select Run as administrator from the selection.

Run as administrator

5. On initial run, the tool will display End User License Agreement, please accept the terms and click Next. Continue on the process until you reach the Scan Type window.
6. Select on Full scan to entire the system and detect any presence of Gen:Trojan.Heur.FU. Then, click Next button to begin the scan process. Scanning may take a while, please be patient.

Full Scan

7. Once Microsoft Safety Scanner finished on scanning the computer, it will display the result. If it finds presence of Gen:Trojan.Heur.FU and other malware, the tool removes them automatically.
8. Click on Finish button to close the tool.

Procedure 4: Remove Rootkit Trojan with Avast aswMBR

A Trojan often drops malware using an advance technology known as rootkit. It hides the installation of Gen:Trojan.Heur.FU from your anti-virus program and injects malicious code to running Windows processes. To complete the clean-up process, you also need to scan and remove rootkit Trojan.

1. Download aswMBR from Avast server. Save it to your computer.

Avast Rootkit Scanner

2. Double-click on the file aswMBR.exe to run the program.
3. If it prompts you to download the latest Avast! virus definition, please click Yes. This is necessary to identify most recent version of the Trojan as well as hidden files of Gen:Trojan.Heur.FU.

Updating aswMBR

4. Click on Scan button to start checking your computer for presence of rootkit Trojan and other viruses. It will display a message "Scan finished successfully" when done.

aswMBR Scan

5. Click Fix or FixMBR to start removing infection. If aswMBR contains the latest Avast! virus definition file, it will automatically clean infected files on your PC.

Protect your PC from Gen:Trojan.Heur.FU or Similar Attack

Turn On Security Features of your Internet Browser

Internet Explorer - Activate SmartScreen Filter

Internet Explorer versions 8 and 9 has this feature called SmartScreen Filter. It helps detect phishing web sites and protect you from downloading malicious files online. You may have avoided Gen:Trojan.Heur.FU virus if this has been active on your PC. To turn on SmartScreen Filter, follow these steps:

1. Please open Internet Explorer.
2. On top menu, select Tools (IE 9). For IE 8, please look for Safety menu.
3. Select SmartScreen Filter from the drop-down list and click on Turn on SmartScreen Filter.

IE SmartScreen Filter

4. Please restart Internet Explorer.

SEE MORE : Comprehensive steps to activate SmartScreen Filter

Google Chrome's Enable Phishing and Malware Protection

With Google Chrome's Phishing and Malware Detection feature, you will have lesser risks browsing the web. It will display a warning when the site you are trying to visit is suspicious. To enable Phishing and Malware Protection, please do these steps:

1. Open Google Chrome.
2. Click on the Customize and control Google Chrome (3-Bars Icon) located on top right corner of the browser.
3. Select Settings from the drop-down list.
4. Once on the settings page, click on Show advanced settings... at the bottom of the page to see the rest of the Chrome setup.
5. Locate Privacy section and mark 'Enable phishing and malware protection'.

Chrome Security Settings

6. Please restart Google Chrome. New settings keep your browser safe while surfing the web.

SEE MORE : Enable Phishing and Malware Protection on Google Chrome

Mozilla Firefox - Block Attack Sites and Web Forgeries

Phishing and Malware Protection is a built-in feature on Firefox version 3 or later. It warns you when a page you are trying to visit contains phishing content or an attack site designed to drop threats on the computer. To help you keep safe while browsing the Internet using Firefox, please follow this guide:

1. Open Mozilla Firefox browser.
2. On top menu, click on Tools. Then select Options from the list.
3. Select Security and put a check mark on the following items:

  • Warn me when sites try to install add-ons
  • Block reported attack sites
  • Block reported web forgeries

Firefox Security Settings

2 thoughts on “Gen:Trojan.Heur.FU

  1. Thom

    Everything worked perfectly of this solution, apart from one thing. My computer keeps crashing the aswMBR scan just before it finishes. I tried restarting the program a couple of times, but nothing seemed to work. Is this step necessary or is there another rootkit Trojan remover?

    Regards, Thom

  2. SureTony

    aswMBR may not be necessary. If you want to run another rootkit scanner, I highly suggest Kaspersky TDSS Killer.

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