Do you think that your Mac was hacked? Do you feel that someone or something is spying on you when you are watching YouTube, or when your Mac is left unattended at home?

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There are many ways how a human or a program can get on your computer and do harm to you and your privacy:

• It could be a spyware, a malicious hacker, or someone you know, such as a parent, a spouse, a friend.
• They can access your photos, videos, and emails
• They can take embarrassing pictures of you using a webcam
• They can listen and record your conversations
• They can monitor your browsing history
• They can use your computer to mine Bitcoins
• They can encrypt everything on your disk and then ask for a ransom

Computers have never been safe, and now when we rely so much on them, it is extremely important to protect ourselves from malicious actors.

This topic is too broad to fit into one blog post, so I am writing mini-series, which will help you to minimize the impact and secure your Mac.

Signs That Your Mac Was hacked

If you are reading this post, chances are you noticed something unusual is happening on your Mac. Sometimes you have a hunch, but you can’t explain it. However, most of those signs can be explained by reasons other than malware or hackers. So, let’s review the major signs.

Mac suddenly became slow for no apparent reasons

I’ve been developing commercial software for more than twenty years. There were many times when I received a call from the customer complaining that their computers, servers, programs are slow.

Every time I am getting a call, the first thing I ask if they did something before they noticed the problem. Do you know how many times they admitted that they changed something? You guessed it, zero. How many times did customers cause the problem? Almost always.

Following are some of the reasons why Mac can be slow:

• There is a virus or other malware
• Not enough disk space on Mac
• New OS was installed
• Hardware failure

Mac is using more Internet than usual

This one is harder to detect now than before. We used to have limits on how much Internet bandwidth we could use. Today, when many people have unlimited data with cable, you may not even know that something is happening.

However, if you are on a limited plan, and you see a significant increase in data consumption (more than 25% more), it’s time to investigate.

The reasons could be the following:

• Your Mac is being used as a bot by hackers
• There is a virus or other malware
• Your little one grew up and now watching YouTube all day on your computer
• New OS was installed
• Youtube and other web sites are taking forever to load

Similar to the previous sign, problems with the Internet could be a sign pointing to a virus or adware affecting the browser. Or it could be a new browser update. Or maybe the system became unstable.

Programs crashing more often

Did you notice that apps getting stuck and eventually crashing? Very often, it’s a sign of malware. Additional reasons for frequent app crashes are the following:

• Lack of memory (RAM)
• Lack of disk space
• Temporary system instability
• Hardware failure
• Unusual pop-ups in the browser

This is something we all have seen. You download an app from the Internet and seems like it was a legit software. But little did you know a good app was bundled with bloatware.

Usually, the result is that your default search engine gets changed from Google to Yahoo, the home page changes, and there are additional icons in the browser toolbar. But there could be other issues such as adware.

Adware is trying to redirect you to other sites, not related to what are you searching for. Their goal is direct traffic to certain sites. More traffic, more money they get. So, they litter your screen with pop-up, hoping that you can click and open the site you don’t want.

New files appear or old files disappear

Malware often creates new files with cryptic names. For instance, ransomware encrypts the files on your disk and renames them. However, there could be more innocent explanations.

For instance, if you can’t find a file, it does not necessarily mean that it was deleted by malware or someone who logged in on your computer remotely. Maybe, you just can’t remember that you deleted the file or the folder. In this case, first, check Trash on Mac.

If you still can’t find what you need, check my post about finding any files. I guarantee, if the file is still on your Mac after reading my post, you will be able to locate it.

How To Tell If Mac Was Hacked

First, scan your Mac with an antimalware solution. Next, turn off remote desktop and screen sharing features to make sure that nobody can connect to your Mac remotely. Verify that there are no keyloggers. Finally, eliminate reasons unrelated to hacking: reboot Mac, perform NVRAM/PRAM reset, check if there is enough space on the startup disk. If possible, visit the Apple Genius Bar for advice.

Now, let’s go over all the above in detail.

Scan Mac for viruses

I recently called Apple Support and complained about the slowness of my MacBook Pro. I could’ve solved the problem myself, but I just wanted how much would it cost for Apple to perform diagnostics on a 5-year old MacBook.

Since I don’t have AppleCare for my Mac, I thought that they would charge me something. Spoiler alert: I wasn’t charged for anything.

So, when I called, the first thing the Apple advisor made me do is to install the Malwarebytes app.

While Malwarebytes is a solid recommendation for scanning, it is not the best. In fact, I stopped recommending it to any Mac user after the test I performed myself recently.

I tested a dozen of antimalware product and only one detected 100% of 117 malware samples I intentionally downloaded on my MacBook. So, if you need a recommendation on a good antivirus check it here.

Tighten up access to your Mac

Programs are not the only threat out there. People sometimes can be even more harmful. There are several ways for someone to spy after you.

One is via remote desktop. Maybe you had experience connecting to servers or other Windows machines at work by remote desktop connection. Macs, even MacBooks, also allow such connections.

Also, it is possible to share the screen of your laptop. While it’s a useful feature, if you mean it, it’s not so good if someone’s using it when you are not aware.

And finally, since macOS has UNIX roots, as any UNIX like the operating system, it can be controlled via SSH protocol. Anyone with access can do pretty much anything on your Mac, and you wouldn’t even know.

If all of the above sounds complicated, don’t worry. I wrote a very detailed post on a topic of remote access to your Mac (https://macmyths.com/how-to-tell-if-someone-is-remotely-accessing-your-mac/). All you need is to go over the post and follow the simple steps outlined there.

Mac keyloggers

For a long time, I thought that all keyloggers could do to record keyboard strokes. Imagine my shock when I started working on my post about keyloggers.

Did you know that a new generation of keyloggers can do screenshots every 5 seconds, or record your messages and social media chats? And they can upload the collected information to the cloud.

And the worst part they are freely available for anyone to purchase!

To find out how one can identify a keylogger on Mac I installed 5 most popular apps on my laptop. They completely trashed my system, but luckily I had backups, so I was able to recover my MacBook.

Things to try if no virus found

While you are maybe suspecting something bad happening on your computer, it very well may be a normal condition.

Things to try before starting panicking:

Reboot

Sometimes glitches in software can make the current state of your system unstable. A reboot is still a remedy for many problems. You can either restart or shutdown and start again. The effect will be the same.

NVRAM/PRAM reset

Mac Os Hacks

Macs historically have a little memory cell where they store some information needed for many Mac peripherals to work. Surprisingly, this area gets corrupt pretty often. Fortunately, there is a very simple fix – reset NVRAM/PRAM and SMC.

Apple has very good instructions on how to perform these tasks.

What they don’t tell is that you have to reset at 2-3 times in a row for a fix to work. I found out this in the school of hard knocks so that you don’t need to.

Clear some space on disk

Lack of space on your startup disk may cause all kinds of issues: app slowdown, app crashes, high CPU usage, and MacBook overheating. Sometimes this may lead you to suspect that your Mac was hacked.

So, first, check how much storage you have left. And if it is not enough, you can either spend money on getting software that helps to clean your disk or read my article on free cleaning tips: How Do I Free Up Disk Space On My Mac Without Software.

New operating system

Apple releases a new version of macOS every year. While they do everything they can to produce quality software, bugs still happen.

For instance, after the recent iOS update on my iPhone, my podcast app starts freezing every time I pause. I still didn’t find why it is happening because I am too lazy busy.

In the case of the issue on hand, if you had a recent OS update, take time to investigate if the issues you are noticing are common for the release.

Check for hardware failure

Macs are very dependable, and they can serve for many years. However, any hardware gradually fails. For example, a failing disk causes unexplained app crashes. Failed RAM will prevent the computer from starting.

There is a good article on the Apple web site about running hardware diagnostics. Try and see what it will report.

Visit Apple Genius Bar

If you have an Apple store nearby, definitely check them out. On several occasions, I had to contact them, they helped me for free. If there is a fee for diagnostics, they should tell you upfront, so you can decide if it’s worth it for you or not.

5 Things To Do If Your Mac Was Hacked

So, you did everything I told you, and you found out that either someone spying or if there was malware on your Mac. There are several things you have to do immediately.

Change passwords

I know it could be painful to change all passwords. I have accounts on hundreds of web sites, and there is no way I could remember all of them. Well, this is not what I am suggesting.

My Mac Was Hacked

You have to change passwords on the most important sites:

• Your primary email account. The one that is linked to your bank accounts.
• Bank and credit card accounts
• Work email password
• Apple ID and iCloud passwords (note, they are not the same)

If you are using one password for all sites, consider using 1Password utility.

Check bank statements

It never hurts to go over your bank statements (if you have any) once a while. If you notice some suspicious activity, then do a little research. But don’t panic right away if you don’t recognize a charge.

Almost every once, when I check my credit card statements, I see one or more charges which I don’t remember doing. However, after 5 minutes or so, I remember what it was.

Check credit report

Everyone in the U.S. has a right to get a free credit report once a year. Since there are three main agencies, you can get a free report three times a year (one from each agency). Search for “Annual Credit Report” in Google, but be careful to skip some ads and use the legit site.

Turn on Two-Factor Authentication

If you didn’t do this yet, turn on two-factor authentication on main sites: email, any money sites, etc. It’s a little bit inconvenient, but it’s the best way to prevent hackers from stealing your data.

What’s Next?

I hope I gave you some high-level information you needed in case if you think that your computer was hacked. Now, I suggest to check the articles I mentioned above in the following order, so you know how to deal with the problems outlined:

Last Updated on

Back up, wipe, reinstall, migrate in only docs, change all passwords on mail and Wi-Fi and all connected devices.

Don’t discuss trading or financials outside strictly necessary conversations, and don’t expect add-on security software or hardware products to actually do what it claims, and do expect at least some of those products to potentially open up new avenues for exploitation.

Don’t run a guest network. Or if you do need a guest network, isolate it. WPA2 with a long pre-and complex shared key,

Use a password manager.

Safari on recent releases can show shared passwords, with a warning triangle in its password store. (Safari uses Keychain for storage, but the caution marker is something that only Safari shows and nor Keychain.) Remove most or all duplicates, when you’re changing passwords everywhere.

Backups, wipe, reinstall from known-good, change all credentials, enable multi-factor authentication where that’s available.

Backups are a key part of breach recovery.

Apple Mac Was Hacked

Notify your financial institutions. Also notify your local police.

Oct 27, 2018 10:00 AM