Mac Virus

Remove Flashback Trojan Horse (Mac Guide) Dec. 2019 Update

Parasite may reinstall itself multiple times if you don't delete its core files. We recommend downloading ComboCleaner to scan for malicious programs installed with it. This may save you hours and cut down your time to about 15 minutes. 

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The best way to protect your computer against a threat of the Trojan Horse category is to never allow such a nasty malware program to enter your system. However, since you are on this page, reading this article about the recently released Flashback Trojan Horse infection, we assume that you are already past the point of keeping malware away from your system and are currently seeking ways of getting the nefarious Flashback Trojan out of your computer. If that is your case, know that we are here to help you. Our guide and the removal tool linked on this page are both great methods of dealing with Trojans like this one. However, it is very important to also have a good understanding of the different characteristics and specifics of this malware group so that you can successfully deal with Flashback and also ensure that you don’t get another such malware program on your computer in the future. Therefore, before we get to the removal part, let us tell you a bit more about the Trojan Horse cyber threats.

Devastating abilities

One of the most typical traits of this malware category is the versatile nature of its representatives. Trojans can oftentimes be utilized in different ways depending on the task that the hackers behind them seek to achieve. Therefore, you can expect anything from severe system damage, data corruption and information theft to personal espionage, loading of more malware such as Ransomware and Rootkits as well as establishing remote control over your system that would allow the criminals who are harassing you to manipulate the processes running in your computer. The examples given here, however, are only a small part of all the nasty abilities that many Trojan Horses have. Therefore, ensuring that such infections are quickly removed is incredibly important if you don’t want to face any of the potential negative consequences of a Trojan Horse attack.

Sneaky infections with very few symptoms

In order to be able to successfully keep Trojan viruses like Flashback away from your computer in the future, you need to know that these threats are really sneaky and stealthy and could come to you in many different shapes and forms. In most cases, some type of disguise would be used to distribute a Trojan – maybe it’s a seemingly harmless e-mail attachment or a download request or update notification coming from some less-than-reliable site. Pirated programs and other illegally distributed software is one other very popular and widespread method of distributing this kind of infections. The problem is, no matter how careful you are, you can always make a mistake and click on something infected while browsing the web. Also, Trojans are well-known for their lack of specific infection symptoms which would make it rather unlikely that you realize that an infection has occurred on your computer before it’s too late. Therefore, we advise you to also not ignore the importance of the presence of reliable security software in your system – a good antivirus or anti-malware tool like the one added to this page can oftentimes make all the difference and safe your system from potential malware attacks that you may not be able to stop manually.


Name Flashback
Type Trojan
Danger Level  High (Trojans are often used as a backdoor for Ransomware)
Symptoms  The Trojan may cause different disturbances in your system but it’s also possible that there are no visible symptoms whatsoever.
Distribution Method  
Detection Tool

Remove Flashback Trojan Horse


We get asked this a lot, so we are putting it here: Removing parasite manually may take hours and damage your system in the process. We recommend downloading ComboCleaner to see if it can detect parasite files for you.

The first thing you need to do is to Quit Safari (if it is opened). If you have trouble closing it normally, you may need to Force Quit Safari:

You can choose the Apple menu and click on Force Quit.

Alternatively you can simultaneously press (the Command key situated next to the space bar), Option (the key right next to it) and Escape (the key located at the upper left corner of your keyboard).

If you have done it right a dialog box titled Force Quit Applications will open up.

In this new dialog window select Safari, then press the Force Quit button, then confirm with Force Quit again.

Close the dialog box/window.



To remove parasite on your own, you may have to meddle with system files and registries. If you were to do this, you need to be extremely careful, because you may damage your system.

If you want to avoid the risk, we recommend downloading ComboCleaner
a professional malware removal tool.

More information on ComboCleaner, steps to uninstallEULA, and Privacy Policy.

Start Activity Monitor by opening up Finder, then proceed to activity-monitor

Once there, look at all the processes: if you believe any of them are hijacking your results, or are part of the problem, highlight the process with your mouse, then click the “i” button at the top. This will open up the following box:


Now click on Sample at the bottom:


Do this for all processes you believe are part of the threat, and run any suspicious files in our online virus scanner, then delete the malicious files:

Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

Scan Results

Virus Scanner Result


The next step is to safely launch Safari again. Press and hold the Shift key while relaunching Safari. This will prevent Safari’s previously opened pages from loading again. Once Safari is opened up, you can release the Shift key.

On the off chance that you are still having trouble with scripts interrupting the closing of unwanted pages in Safari, you may need to take some additional measures.

First, Force Quit Safari again.

Now if you are using a Wi-Fi connection turn it off by selecting Wi-Fi off in you Mac’s Menu. If you are using a cable internet (Ethernet connection), disconnect the Ethernet cable.


Re-Launch Safari but don’t forget to press and hold the Shift button while doing it, so no previous pages can be opened up. Now, Click on Preferences in the Safari menu,

Preferences in Safari

and then again on the Extensions tab,

extensions in safari

Select and Uninstall any extensions that you don’t recognize by clicking on the Uninstall button. If you are not sure and don’t want to take any risks you can safely uninstall all extensions, none are required for normal system operation.

The threat has likely infected all of your browsers. The instructions below need to be applied for all browsers you are using.

Again select Preferences in the Safari Menu, but this time click on the Privacy tab,
Privacy in Safari

Now click on Remove All Website Data, confirm with Remove Now. Keep in mind that after you do this all stored website data will be deleted. You will need to sign-in again for all websites that require any form of authentication.

Still in the Preferences menu, hit the General tab

General Tab in Safari

Check if your Homepage is the one you have selected, if not change it to whatever you prefer.
Default Home Page

Select the History menu this time, and click on Clear History. This way you will prevent accidentally opening a problematic web page again.

firefox-512 How to Remove Flashback  From Firefox in OSX:

Open Firefoxclick on mozilla menu (top right) ——-> Add-onsHit Extensions next.

pic 6

The problem should be lurking somewhere around here –  Remove it. Then Refresh Your Firefox Settings.

chrome-logo-transparent-backgroundHow to Remove Flashback From Chrome in OSX:

 Start Chrome, click chrome menu icon —–>More Tools —–> Extensions. There,  find the malware and  select  chrome-trash-icon.

pic 8

 Click chrome menu icon again, and proceed to Settings —> Search, the fourth tab, select Manage Search Engines.  Delete everything but the search engines you normally use. After that Reset Your Chrome Settings.

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!

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