Remove Trojan:DOS/Alureon.A

Threat Summary

Threat: Trojan:DOS/Alureon.A
Type: Trojan
Alias: Backdoor.Tidserv, Backdoor:W32/TDSS, BKDR_TDSS, Trojan-Dropper.Win32.TDSS
Source: View on Microsoft website
Removal Tool: ‚Ėľ DOWNLOAD MalwareFox


Trojan:DOS/Alureon.A is a harmful Trojan that may cause enough damage to make the infected computer unstable. This malware is part of the Alureon family, which mostly targets the Master Boot Record (MBR) of the compromised PC. Among other things it is capable of is stealing data by intercepting Internet traffic and extract information from it. Backdoor is the other strength of this Trojan. Trojan:DOS/Alureon.A may open a connection on your PC that will allow remote attacker to control it. This link can also be use to gather vital data from the compromised computer including userís credentials.

There are a number of methods how Trojan:DOS/Alureon.A may infiltrate a computer. However, security expert ruled that vulnerabilities from Windows operating system are the major cause of infection. Other sources of the infection can be derived from some Trojans that was made to physically drop Trojan:DOS/Alureon.A on target computer. There are also new variants of Alureon that are linked to the spread of this aged malware. Do not ignore links from emails, chat programs, and social networking sites. It can also be used by an attacker to deploy this threat.

Upon infection, Trojan:DOS/Alureon.A modifies part of the Master Boot Record and appends some code, which makes it Trojanís repository. Each time Windows starts, it runs on its own and loads other harmful code making Trojan:DOS/Alureon.A a dominant threat. It can actually end processes that are related to security and antivirus programs. With a disabled antivirus, there is no way that you can delete this threat. For this reason, we provide an alternative solution to remove Trojan:DOS/Alureon.A. See the complete guide below.

What are the Symptoms of Trojan:DOS/Alureon.A Infection?

Warning and alerts from installed antivirus program may be the only visual sign of Trojan:DOS/Alureon.A infection. Refer to image below for a screenshot of the detection.

Trojan:DOS/Alureon.A Detected by MSE

Procedures to Remove Trojan:DOS/Alureon.A

Removal steps on this page will help you get rid of the threat effectively using tools and virus scanners. Please make sure that you will carry out the guide in exact order.

Procedure 1: Scan Computer in Safe Mode Using Installed Anti-virus Program

1. When troubleshooting a PC, one common step is to boot operating system into Safe Mode with Networking. The same approach will be used in the removal of Trojan:DOS/Alureon.A. Please execute instructions based on your Windows OS version.

Start Windows 8 / Windows 10 in Safe Mode with Networking

- Close all running programs on your computer because we will need to restart Windows on this procedure.
- Press and Hold Shift key on your keyboard while clicking on Restart.
- You will then be presented with Troubleshooting Options.
- Click on Troubleshoot icon.
- Then, Click on Advanced Options icon.
- Select Startup Settings icon and then, Click on Restart button.
- When Windows restarts, it will prompt to choose number from the list of options. Press the number on your keyboard that corresponds to Safe Mode with Networking, commonly number 5.
- Once in Safe Mode, please proceed to the next step which is running a virus scan on the computer.

Start in Safe Mode with Networking (Windows XP / Vista / 7 Instruction)

- Please restart the computer and just before Windows start, press F8 on your keyboard repeatedly. You will be presented with Advanced Options Menu.
- From the selections, choose Safe Mode with Networking. Please use keyboard's arrow up/down to navigate between selections and press Enter to proceed.


2. Once your Windows is running in Safe Mode, open your installed anti-virus programs and update it to the most recent version by automatically downloading necessary updates.

3. Thoroughly scan the computer and remove all identified threats. Do not restart or turn off the computer after the scan process. You still need to run another scan. Please follow the next procedure.

Procedure 2: Scan and remove Trojan:DOS/Alureon.A files with MalwareBytes Anti-Malware

To remove Trojan:DOS/Alureon.A, download Malwarebytes Anti-Malware. This tool is effective in getting rid of Trojans, viruses and malware.

Download MalwareFox

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, MalwareFox will launch.

MalwareFox Scanner

4. Select SCAN button of MalwareFox application.

5. Scanning process will start and infections list will be displayed. Click NEXT to remove them.

MalwareFox Detection Result

Procedure 3: Run extra scan with Junkware Removal Tool

To make sure that no more malicious files linked to Trojan:DOS/Alureon.A are inside the computer, we must run another effective scanner. This time, use Junkware Removal Tool. No installation is necessary with this tool.

Download JRT

1. Click the button above to start the download process. Save the file to your preferred location.

2. Junkware Removal Tool will close all running applications later. So, before executing the file, please Bookmark or Print this page. And then, close all programs.

3. Double-click the JRT.exe file to initiate the tool.

4. It will prompt you to "Press any key to continue."

JRT Scanner

5. Junkware Removal Tool will create a Restore Point and proceed with the scan. Please wait for the scan process to finish.

6. After scanning the computer, JRT will open a Notepad containing scan logs. It may have not find Trojan:DOS/Alureon.A relevant entities, but it will surely delete any malicious items not found in the previous scans.

Procedure 4: Reset Affected Internet Browser

Reset browser settings of Google Chrome:

1. Open Google Chrome browser.

2. In the address bar, type this: chrome://settings/ and then, press Enter.

3. Navigate at the end of the page and click on Show advanced settings.

4. At the bottom of the page, click on Reset settings to remove all changes made by Trojan:DOS/Alureon.A.

Reset Google Chrome

Reset Internet Explorer Settings:

1. Open Internet Explorer software.

2. Navigate to top menu and click Tools > Internet Options.

3. On Internet Options window, select Advanced tab.

4. In order to reverse modifications caused by Trojan:DOS/Alureon.A, click on Reset button to bring back Internet Explorer's settings to their default condition.

Internet Explorer

Reset Firefox to its default state:

1. Open Mozilla Firefox program.

2. Navigate to top menu and Open Help Menu. Then, select on Troubleshooting Information.

3. Click on Refresh Firefox button to erase the effect of Trojan:DOS/Alureon.A.

Reset Firefox

Protect your PC from Trojan:DOS/Alureon.A or Similar Attack

Turn On Safe Browsing Features

Google Chrome's Protection from Dangerous Sites

With Google Chrome's Dangerous Site Protection feature, you will have lesser risks browsing the web. It will display a warning when the site you are trying to visit is suspicious, thus, you can prevent Trojan:DOS/Alureon.A infection. To enable protection from dangerous sites, please do these steps:

1. Open Google Chrome.

2. In the address bar, type this: chrome://settings/ and then, Press Enter.

3. Once on the settings page, click on Show advanced settings... at the bottom of the page to see the rest of the Chrome setup.

4. Locate Privacy section and mark 'Protect you and your device from dangerous sites'.

Chrome Security Settings

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

SEE MORE : Enable Google Chrome's protection from dangerous sites

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 programs including Trojan:DOS/Alureon.A. 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

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 such as Trojan:DOS/Alureon.A. 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 Open Menu. 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

Edge Browser - SmartScreen Filter

SmartScreen filter is a built-in feature in Microsoft Edge browser that can help you deter malicious programs such as Trojan:DOS/Alureon.A. It can block malicious web sites and downloads.

1. Open Microsoft Edge browser.

2. Click on More Actions button located at top right corner of the screen.

3. Select Settings from the drop-down list.

4. Under Settings menu, go to Advanced Settings section and click on View Advanced Settings.

5. Scroll down to "help protect my PC from malicious sites and downloads with SmartScreen Filter". Turn it to ON.

6.You may now restart Microsoft Edge browser.

Edge SmartScreen Filter

Click Here to Leave a Comment Below 17 comments
Dan - November 4, 2012

Neither MALAWARE BYTES nor Microsoft’s Defender offline would get rid of ths for me.
Kapersky did the trick however……

Bob Patten - December 7, 2012

None of this worked for me, I’ll try the “Kapersky trick”…

Bob Patten - December 7, 2012

Yup, the “Kapersky trick” worked like a charm and only took about five minutes… Save the time and use this link:

joe - December 11, 2012

Thanks Dan and Bob. You guys were right. the Kapersky trick work super fast! The malaware bytes and the other two took forever. Kapersky took 2 mins! and voila! Virus gone!

lORETTA - December 17, 2012

Thank you very much for the info. regarding the Dos/Alureon.A virus. It appears that Kapersky TDSS Killer combined with microsoft security essentials did the job of removing this virus. It also detected a couple other unnoticed ‘rootkillers’ and only took about 4 minutes.

Mike - December 20, 2012

I used the Kapersky download and it worked like a charm. Another scan using MSE and nothing was found. It took me a week to get rid of this. This virus made a mess of my computer and I had to re-install drivers as well as OS and finally Kapersky did the trick. Thanks Bob.

NEML - December 24, 2012

Kaspersky is it! Wiped out the Alureon as well as other malware that I didn’t even know was there. Took only about 2 minutes from the time I typed on the link to when the malware was wiped out. Also as someone else wrote, it will work with MSE to clean out the threats on your computer. Nice!

Stephen - December 27, 2012

Awesome! Thanks to all of you for putting up that link. I had been dealing with the Trojan Alureon virus for several days now. The ‘Kapersky trick’ took about 3 or 4 minutes to install and removed the virus instantaneously.

Gary - January 5, 2013

Amazing! This saved my computer. I was on the edge of a complete meltdown, with my computer very slow and getting the blue screen of death frequently. I went through the procedures along with Security Essentials and now my computer feels like it’s running as well as a new reload, but I didn’t lose anything. This Alureon in the Master Boot Sector (MBR) was nasty! Glad I trusted this website to fix my computer.

Bob - January 11, 2013

WOW….I had been having blue screens for awhile but attributed it to driver issues until a Windows update detected and partially, but not totally removed some of it. Norton and Norton rootkit did not even detect it. Came upon this page searching the virus and boy am I glad I did.Kaspersky so far appears to have removed it. Laptop is running smoothly and fast.

Ervin - January 19, 2013

I had no clue what was happen on my computer. Blue screen popped up but I didn’t think of a virus. I thank God for those who share help for PC dummies like me. I ran across this info. and man it was only moments that this cleaned out the virus. I admit I am so nervous this may happenvs again with all the crazy attacks on line, but at leastawith your help I have hope!o

stephanie - March 10, 2013

i cannot believe that link worked amazing! I have tried to remove this virus for 1 yr with no luck. until now thank you everyone!

Ronnie S - April 2, 2013

Kaspersky did it for me. Had been using other tools and they only removed bits and pieces but never got full control of my computer and keyboard back until I used Kaspersky. It worked wonders for me and I think you’ll like what it does for you too.

Pc - April 6, 2013

I tried using windows removal and now
My laptop just keeps rebooting over and over and I can’t get anywhere arghhghggggh….it detected it i hit remove or clean and it gave me green light then once I restarted it just wants to keep restarting. Tried f8 and safe mode and keeps wanting to restart???

Robin - April 23, 2013

OK the Alureon.A virus is a nightmare but thanks to the above good folk the Kaspersky wiped it out. Thank you thank you thank you

Dr. Ruth - April 24, 2013

My computer was infected with the Trojan Dox Alureon A virus for a few weeks, I tried everything to remove it. I ran Microsoft Safty Scanner and it only partially removed the Alureon Virus. Then, I tried the Kaspersky removal above, and wow, the virus is gone. It only took a couple minuets. Thank you, thank you, amazing!

Linda - June 4, 2013

Kapersky is fantastic! I tried everything to get rid of the dangerous Alureon.A virus. Nothing worked until I downloaded Kapersky. Fast and easy. I’m so glad I found this website…saved me hundreds of dollars.


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