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Computer viruses hold a sweet spot between boring, everyday occurrences, dating back to the 70s, and dramatic, science fiction fueled monsters that will haunt us in our new information-driven world.
One may ask, “Do you need antivirus to protect your Mac?” The reality is, all computers, even Macs, are vulnerable to malware (short for malicious software). While Apple takes a lot of security precautions, how secure your Mac is depends on your knowledge of how to check for viruses and how to remove them.
Whether you want to know how to remove virus from MacBook Pro, MacBook Air, or iMac, learning to keep your information safe first is necessary and easy, with a few tips from the professionals.
Get Setapp to protect Mac from malware
- Jul 28, 2018 I downloaded an app from the App Store to get rid of malware to no avail. All AV software, in particular from the App Store, is completely useless. Get rid of Bitdefender. It will not help you one bit. If you install another Trojan, it will go right through. Keep MalwareBytes for Mac. It's job is not preventative (mostly), but to clean up after.
- May 25, 2020 I am an independent advisor and a Mac user like you, and I would be happy to help you out with this. I would recommend to try uninstalling the Teams app, and then re-installing it. First, Quit Teams by right-clicking the Teams app in the dock, then holding down Option and clicking Force Quit.
- Mar 12, 2019 While Apple takes a lot of security precautions, how secure your Mac is depends on your knowledge of how to check for viruses and how to remove them. Whether you want to know how to remove virus from MacBook Pro, MacBook Air, or iMac, learning to keep your information safe first is necessary and easy, with a few tips from the professionals.
- May 15, 2020 Thanks for your post in Microsoft community. Regarding your issue, suggest you to use Teams online app (with Google chrome browser) and check if it works. Ask one of the affected user to change his network use Open network (no firewall or antivirus blocking Teams) and check.
Your computer deserves to be healthy. Download Setapp, an apps toolkit that covers reliable protection methods against any kind of malware.
How to scan your Mac for a virus
Why checking your Mac for viruses is important? If a computer virus was the only thing to watch out for, this world would be a simpler place. Malware, adware, spyware, malicious files, worms, trojans, phishing software, you name it, you should check for it. The old way of thinking was that because there are more PCs than Macs in the world, the “virus people” would focus on them instead of Macs. But, we’re not in the 2000s anymore. In fact, in 2018, Apple moved to the fourth position in global laptop shipments. This means, Macs are no longer shiny white boxes that are meant for fun and entertainment.
Not only do we run our businesses off Apple devices and different versions of macOS but we also store family photographs, send out sensitive info — and, thanks to cloud computing, each device is synchronized. Unfortunately, this means your Mac could be a far juicier target than the PC sitting in some corner cubicle.
Know what a Mac virus is
Most of us are familiar with recognizing what a virus looks like thanks to its atrocious design and alarming vocabulary. However, not all viruses take the shock-and-scare approach to getting on your Mac. The latest adware could look like an Adobe Flash Player installer, but is, of course, fake. Not only does it trick you into thinking it's something as normal as Flash, but the installed adware then pretends to be a virus scanner. It shows you bogus problems and encourages you to fix them by giving over sensitive information.
Other forms of viruses could look like Microsoft Office files (e.g. Excel sheets, Word documents), Adobe Photoshop add-ons, as well as music and movie files that you get from BitTorrent or other file sharing programs. But the most common file format that a virus takes is a .dmg file, because it was created by Apple itself to help install good software on your computer. Your task in securing your Mac is to look out for .dmg files showing up when you’re trying to install something. If you’re ever trying to download something you know is supposed to be an image, music, movie, or document, but you get a .dmg file instead — that is as red as a red flag gets in terms of viruses. Do yourself a favor and delete that file immediately.
Keep Mac virus sources in mind
When it comes to having your Mac infected by a virus, we probably expect the attack to come from a stranger. Truth be told, a lot of viruses come from our friends, family, and colleagues, who unfortunately became the primary victim and are now unintentionally passing their viruses to you.
A popular malware virus of 2017 was embedded into a Word document — a Mac Word file, not a PC one. In 2018, Apple discovered flaws in their Intel processor chips that could lead to two kinds of very ambitious strains of Mac viruses too. It’s wild to think that even iPads and iPhones can contract malware.
How to check for malware
In an ideal world, scanning for viruses and the other methods for malware removal should be automatic and happen nearly continuously. In reality, you can consider yourself reasonably safe if you scan your Mac close to once a week. Fortunately, there are quite a few ways to make sure you are as protected as possible.
A good start to scan your Mac for viruses is to see whether you have applications installed that you don’t recognize:
- Go to the Applications folder via Go > Applications in Finder or using the shortcut Shift + Command + A.
- Scroll through the list and delete any unknown applications.
- Then empty the trash.
The second step you should do is check for browser hijackers and adware extensions:
- Go to Safari > Preferences. See what the Homepage URL is currently set to and correct if needed.
- Then proceed to the Extensions tab and uninstall any you don’t recognize, as they could spy on you, save your private data, and redirect you to their malicious websites.
How to run a Mac virus scanner and stop viruses from stealing your information
It’s a common misconception that viruses only happen to people who are gullible, ignorant, or technologically illiterate. The stigma is that hackers prey on people, when in reality, they prey on behavior.
Our basic assumption with Macs is that we expect Apple and our applications to have done all the security work for us. In truth, every user has to adjust their own behavior when using their Mac.
Do you use public WiFi? Consider getting a Virtual Private Network (VPN) to encrypt the connection between your laptop and the external network. Shimo is a great VPN manager app that will help you here. While using it, raw information (whether sensitive or not) can’t be fed to any malicious programs lurking on your Mac, and hackers on the same network won’t be able to decode anything you’re working on.
Speaking of encryption, Macs using OS X Lion or later come with the option to encrypt their hard drives using FileVault 2. Although encryption won’t prevent viruses from entering your computer (for that, you’ll need a scanner), it would still be very helpful in stopping viruses from stealing your information. To turn on FileVault:
- Go to System Preferences
- Select Security & Privacy
- Navigate to the FileVault tab
- Choose Turn On FileVault
Keep your Mac secure and virus-free
Trademark signs of something being wrong with your Mac: slow processing memory, a bloated disk space, intense CPU usage, and network speed lag. Unfortunately, viruses don’t live in an easy-to-find location like your computer’s desktop. They can be embedded within an application, most notably, your favorite web browser, where it’s easier for them to view what you’re viewing and track what you’re typing. If you kept on seeing weird websites taking over your search bar, it's a sign that your browser has been hijacked. Other applications can get corrupted or infected too, especially if they have particularly weak security systems. Another example could be an email app you use or an open-source application that is behind on their patch upgrades.
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If you think one of your applications is infected, a typical knee-jerk reaction would be to delete the whole thing and redownload it. Often, this will do the trick, but there are simpler solutions available. Clearing the application's cache should always be your first step, and, if there are optional hidden files, consider removing them as well.
Scan your Mac for viruses with CMM X
Run an instant malware scan to identify and remove suspicious files from your Mac. There’s no tool that can do it better than CleanMyMac X.
To remove any application’s cache and get rid of Mac malware from the Library folder:
How To Check If Mac Has Virus
- Use the shortcut Shift + Command + G to Go to Folder
- Type ~/Library/Caches and choose Go
- Delete any particular files inside the folder
If you are unsure about deleting cache files manually, use an app like CleanMyMac X:
- Launch CleanMyMac
- Go to System Junk and click Scan
- When the scan is complete, choose Review Details
- Select User Cache Files and pick the caches you’d like to delete
- Click Clean
In addition, CleanMyMac now features a Malware Removal function, using which should become your weekly habit.
- In CleanMyMac, choose the Malware Removal tab
- Click Scan
- Follow the instructions given. Hopefully it should say your Mac is clean most of the time.
Unfortunately, not all viruses are easy-to-understand files that just sit on your computer. Sometimes they are root certificates that intercept your passwords and messages, and send a copy to hackers. To effectively secure yourself from this, only download apps with valid developer certificates. Which ones are those? It’s hard to know but Apple built a feature that could help you here.
- Go to System Preferences
- Select Security & Privacy
- In the Allow apps downloaded from: select App Store and identified developers
You are well on your way to being protected from malware now. But, the truth is, simply avoiding viruses is not enough. You need to be proactive — it’s time to get a virus scanner.
Check viruses like a pro
If you want complete Mac security, there is no better tool than CleanMyMac X, which can effortlessly scan for all the latest viruses, malware, spyware, and more. Just launch the app on the regular basis and click the Smart Scan option to inspect your Mac for any suspicious activity, besides other suggested features for optimization and cleaning out old files.
Remove viruses from Mac completely
Using a tool like CleanMyMac makes getting rid of viruses, of all shapes and formats, very easy. After the scan, it tells you what it’s found and gives you the option to remove it completely right then and there. Additionally, it will give you all kinds of other great options on how to optimize your Mac’s performance.
As mentioned above, hackers who want to steal your information don’t target you specifically, they target your behavior. So, with this in mind, change your behavior when it comes to using your Mac in potentially unsafe ways. Recognize that viruses come and go, all the time, and across many different file formats. If you get a virus, you’re not ruined.
Arm your computer with encryption tools (like FileVault and a VPN), so that your information can’t be stolen. Practice a healthy dose of skepticism when downloading files. But, most importantly, get professional apps that bring you the most results, like CleanMyMac or Shimo — all of which are available on Setapp for your to try free. So get a scan now and see what it says.
In this article, we will look at the most common Mac viruses and security flaws, how to detect them, prevent your Mac from getting them, and how to remove them.
The more macOS grows in popularity, the more lucrative it becomes to hackers and rogue programmers, and with no anti-virus, your MacBook is at risk of attack. Viruses on Mac are more common than you might imagine. We’re going to run through known Mac viruses, malware, and security flaws and show you how to keep your computer safe using CleanMyMac X.
Something to note before we continue: a virus is a type of malware, capable of copying itself and spreading across a system. Malware is a blanket term for a wide range of malicious software including adware, spyware, ransomware, and Trojans. So all viruses are malware, but not all malware are viruses if that makes sense?
Okay, let’s dig in.
How a Mac virus infects your system
How does a Mac virus find its way onto your system in the first place? Typically with a helping hand from you.
Apple viruses rely on you downloading a program, clicking a link, or installing an app or plugin.
The most common ways for malware to infiltrate your computer is through third-party browser plugins like Adobe Reader, Java, and Flash, or by using a Trojan horse or phishing scam — an app or email that appears to be from a legitimate source, but is in fact fraudulent. The moment you click on a link and enter details or download the seemingly genuine app, you give the green light for a virus to infect your system.
The best way to avoid a virus on Mac is to be vigilant. Double check every app that you want to download and every email that you receive before following through on an action. If something seems off, there’s every chance that it is.
However, as you’ll see from some of the viruses, in certain cases even vigilance can’t protect you.
An X-ray of a Mac virus: Here is what it looks like
Below is an executable command of an adware code. As you can see it aims to 'download offers' that users see on their computers
Known Mac viruses
1. Microsoft Word macro viruses
What’s that, a Microsoft program bringing its virus-riddled programs over to Mac? Unfortunately, yes.
Macros are commonly used by Word users to automate repetitive tasks and they're a prime target for Malware peddlers. Macro support on Mac was removed by Apple with the release of Office for Mac back in 2008, but was reintroduced in 2011 meaning files opened with macros enabled could run a Python code to log keystrokes and take screenshots of personal data.
In 2017, Malwarebytes discovered malware in a Word document about Donald Trump to the worry of Mac users. However, the chances of being infected rely on you opened that specific file, which is slim.
A warning message that Apple displays anytime a file contains macros should be enough to keep you safe from Word macro viruses.
2. Safari-get
Safari-get is a denial-of-service (DoS) attack that began targeting Mac in 2016. The malware is hidden behind a link in a seemingly genuine tech support email — you click on the link, the malware makes itself at home on your computer.
What happens then depends on whether you’re running macOS 10 or 11. The first variant takes control of the mail application to force create multiple draft emails. The second force opens iTunes multiple times. The end goal for both is the same: overload system memory to bring your Mac to its knees so that you call up a fake Apple tech support number and hand over your credit card details to a bogus team on the other end of the line.
MacOS High Sierra versions 10.12.2 and above include a patch for this vulnerability, so updating your machine should keep you safe.
3. OSX/Pirrit
OSX/Pirrit is a virus that is able to gain root privileges to take it upon itself to create a new account and download software that you neither want nor need. The virus was found by Cybereason to be hidden in cracked versions of Adobe Photoshop and Microsoft Office that are popular on torrent sites.
A stark reminder, if ever you needed one, to never download pirated software!
Known Mac malware
1. OSX/MaMi
OSX/MaMi holds the distinction of being the first macOS malware of 2018. It targets Mac users with social engineering methods such as malicious emails and website pop-ups. Once it’s made its way onto a system, the malware changes DNS server settings so that attackers can route traffic through malicious servers and intercept any sensitive data. MaMi is also capable of taking screenshots, downloading and uploading files, executing commands, and generating mouse events.
The Hacker News provides instructions on how to identify the virus on your system:
“To check if your Mac computer is infected with MaMi malware, go to the Terminal via the System Preferences app and check for your DNS settings—particularly look for 82.163.143.135 and 82.163.142.137.”
2. OSX/Dok
This piece of Malware is a worrying one in that it is signed with an Apple-authenticated developer certificate, thus allowing it to bypass Mac’s Gatekeeper security feature and XProtect. Like OSX/MaMi, OSX/Dok intercepts all traffic (including traffic on SSL-TLS encrypted websites) moving between your computer and the internet to steal private information. Network analyzer app for mac free.
Since it arrived on the scene in April 2017, Apple has revoked the developer certificate and updated XProtect, however, it remains one to look out for.
3. Fruitfly
Fruitfly malware has stolen millions of user images, personal data, tax records and “potentially embarrassing communications over a 13 year period by capturing screenshots and webcam images. Researchers are unsure how the near-undetectable “creepware” finds its way on to Mac systems and while Apple has been working to patch the issue, it’s unknown if newer versions still exist in the wild.
4. X-agent
X-agent is classic malware capable of stealing your passwords and iPhone backups and taking screenshots of sensitive data. It has mainly targeted members of the Ukrainian military, which is very bad, of course, but if you're not a member of Ukrainian military you’re unlikely to be affected.
5. MacDownloader
While its name suggests it could be a useful app, MacDownloader is a very nasty piece of malware programmed to attack the US defense industry. It’s hidden inside a fake Adobe Flash update and shows a pop-up claiming your system is infected with adware. By clicking on the alert and entering your admin password, MacDownloader lifts sensitive data, including passwords and credit card details, and sends it to a remote server.
MacDownloader is designed to attack a particular audience, but it’s worth checking for updates on Adobe’s official website before installing any new version of Flash.
6. KeRanger
KeRanger is macOS’s first introduction to ransomware — malware that encrypts system files and demands a ransom to decrypt them. It was bundled in with the torrent client Transmission version 2.90 and installed at the same time, using a valid Mac app certificate to sneak through Apple security. Once document and data files are encrypted, KeRanger demands payment in bitcoin for the malware to be removed.
Transmission has released an update to remove the malware and Apple has removed KeRanger’s GateKeeper signature to protect users. If you’re using Transmission 2.90, head over to the Transmission website to download the latest update.
Known Mac security flaws
1. Goto fail bug
The Goto fail bug was a bit of an embarrassing one for Apple in that the security flaw was as a result of its own doing. A bug in Apple’s SSL (Secure Sockets Layer) encryption meant that a Goto command was left unclosed in the code, thus preventing SSL from doing its job to protect users of secure websites. The flaw put communications sent over unsecured Wi-Fi (the hotspots you use at the mall and in coffee shops) at risk, allowing hackers to intercept passwords, credit card details, and other sensitive information.
Apple has since patched the issue on macOS, but it certainly makes you think twice about how you browse the web on your MacBook in a public place.
2. Meltdown and Spectre
In January 2018, it was announced that there was a flaw in Intel chips used in Macs, giving rise to the dastardly duo of Meltdown and Spectre.
From Apple:
The Meltdown and Spectre issues take advantage of a modern CPU performance feature called speculative execution. Speculative execution improves speed by operating on multiple instructions at once—possibly in a different order than when they entered the CPU. To increase performance, the CPU predicts which path of a branch is most likely to be taken, and will speculatively continue execution down that path even before the branch is completed. If the prediction was wrong, this speculative execution is rolled back in a way that is intended to be invisible to software.
The Meltdown and Spectre exploitation techniques abuse speculative execution to access privileged memory—including that of the kernel—from a less-privileged user process such as a malicious app running on a device.
Meltdown and Spectre affects all Mac systems, but Apple insists there are no known exploits currently impacting customers. macOS 10.13.2 and above includes a patch to protect against both flaws.
3. High Sierra “root” bug
As far as security flaws go, High Sierra’s “root” bug is a pretty big one. The flaw, which was discovered by software developer Lemi Orhan Ergin, allowed anyone to gain root access to a system by leaving the password field blank and trying multiple times in a row. So, anyone with physical access to your system, or access via remote desktop or screen-sharing, could type in “root” and hit enter a few times to gain full control of your Mac. Scary thought, huh?
Apple has recently released an official fix for the flaw, but it’s worth taking care about who shares access privileges on your Mac.
How to recognize a virus on Mac
So how do you spot a virus on your MacBook Pro or iMac? In the case of ransomware like KeRanger or a DoS attack like Safari-get, the issue is in your face. With other malware, however, the infection is less obvious.
A few of the tell-tale signs include:
- Unexpected system reboots
- Apps closing and restarting for no reason
- Browsers automatically installing suspicious updates
- Web pages obscured with ads
- Drop in system performance
How to avoid a virus on Mac
We briefly covered this at the top of the article, but there are measures you can take to help safeguard your system:
- Always check the source of an email by looking at the address of the sender
- Avoid pirated software
- Avoid software and media downloads from torrent clients
- Avoid apps or pop-ups that ask you to “fix” an infected Mac
- Never download codecs or plug-ins from unknown websites
- How to remove a virus on Mac
If you suspect a Mac virus has infected your system, it’s important to address the problem immediately. There are two ways that you can do this: manually or with CleanMyMac X.
How to remove a virus on Mac manually
To remove a virus manually, the first thing to do is find out what’s causing the problem.
The chances are it could be a downloaded file, so go to your Downloads folder and search for .DMG files. If the file is unfamiliar, delete it and empty the Trash.
If an app is the issue, go to your Applications, drag the icon of the culprit to the Trash bin and empty the Trash immediately.
Both of these methods offer a quick fix, but neither is the most comprehensive of solutions. The way in which viruses work means that the infection could have spread to system folders. If the problem persists, opt for the more robust CleanMyMac 3.
How to remove malware on Mac with CleanMyMac X
CleanMyMac X is designed to detect and remove malware threats from your Mac, including adware, spyware, ransomware, worms, and more.
If malware is lurking within your Mac, it won’t be after CleanMyMac is done with it.
- Download CleanMyMac X (free download) and launch the app.
- Click on the Malware Removal tab.
- Click Scan.
- Click Remove.
Mac Check App For Virus Windows 10
This app is actually notarized by Apple so you are safe using it. Speaking of malware, it has a real-time monitor that keeps an eye on your Launch Agents. If an unkown app tries to add itself into your system folders, you'll get an instant notification from CleanMyMac X.
Keep your Mac virus-free
For the most part, using a Mac is a pleasant, malware-free experience, but no computer is ever 100% virus-free. Keeping abreast of known Mac viruses so that you know what to look for and airing on the side of caution when downloading software will help keep your system running smoothly. And if a rogue app does make its way on your system, keep CleanMyMac X close to hand to remove it immediately and completely.
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