Mac Virus

Remove “Safari cannot be opened because of a problem Check with the developer” (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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“Safari cannot be opened because of a problem Check with the developer”

If all of a sudden your Safari brings up a message that says: “Safari cannot be opened because of a problem Check with the developer”, unfortunately, you may have been infected by a strain of the Flashback Trojan Horse

One of the most problematic malware categories is the so-called Trojan Horse category and it is in this article that you will learn more about the nasty capabilities of these cyber threats. The representatives of this group are advanced computer threats which can be used by the cyber criminals for a variety of harmful deeds. Depending on what exactly the hackers want to achieve, they can program each Trojan-based infection to perform a specific criminal task in the background of the infected system. Unlike other types of malware such as Spyware or Ransomware viruses, which are more specialized in one particular criminal action, the Trojans are very versatile. They can serve as multipurpose tools and perform different harmful actions.  A major problem with these infections is that they usually show no visible symptoms neither during the moment of infection nor after they have nested inside the system. The other thing that makes them so fearful is that one can never be sure what the malware may be trying to achieve. Sometimes, the Trojan may be after the sensitive personal data which could be stored on the computer. In other cases, the malware may be programmed to destroy some important files, to corrupt the OS or spy on the victim through their webcam and mic. There are also instances where the Trojan could act as a backdoor for other nasty viruses as well as a remote access point for the hackers. Of course, there could be many other possible uses of this advanced form of malware which really cannot be covered with this one single article. However, the main point here is that, no matter what the Trojan could be after, if you detect it on your system, you should take immediate actions to remove it in order to avoid the negative consequences of its attack.

On this page, you will find a trusted removal tool which proves effective against different threats and a detailed removal guide dedicated to the elimination of one very sneaky Trojan-based infection named “Safari cannot be opened because of a problem Check with the developer”.

More about “Safari cannot be opened because of a problem Check with the developer”

“Safari cannot be opened because of a problem Check with the developer” is an advanced Trojan-based infection which can cause a lot of harm to your computer – from theft, fraud, espionage and system destruction to blackmailing and much more. Sadly, you can never know what damage exactly this malware may cause because its nature is so versatile that it could be used for literally anything criminal you could think of. The reason we have dedicated a whole removal guide to it is the fact that a lot of web users have recently gotten infected without their knowledge and some of them have even faced some really unpleasant consequences of the hidden attack. If you don’t want to end up with your system destroyed, your sensitive data stolen or your machine exploited for criminal purposes, it is definitely a good idea to run a full scan with your antivirus and remove everything that seems suspicious or Trojan-related. Also, you should try to keep away from the potential transmitters of this nasty infection because there could be many seemingly-harmless links, ads, spam messages, email attachments and software installers, which could secretly deliver “Safari cannot be opened because of a problem Check with the developer” to your computer if you happen to click on them. That’s why it is best if you to stick to reputed web locations and avoid potentially unsafe websites, download suggestions, suspicious messages, torrents and questionable installers because you never know where they may redirect you to or what they might install on your machine.


Name “Safari cannot be opened because of a problem Check with the developer”
Type Trojan
Danger Level  High (Trojans are often used as a backdoor for Ransomware)
Symptoms  Frequent system errors, sluggishness, system crashes, unusually high CPU or RAM usage. 
Distribution Method  Spam, malicious emails, harmful attachments, infected links and ads, illegal websites, low-quality installers, pirated content.
Detection Tool

Remove “Safari cannot be opened because of a problem Check with the developer”


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 “Safari cannot be opened because of a problem Check with the developer” 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 “Safari cannot be opened because of a problem Check with the developer” 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.

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