1. How To Check If Your Computer Got Hacked Machine
2. How To Check If Your Computer Is Hacked Mac

If your PC has been hacked or infected with a virus, or some kind malware, you have to take quick action to protect your information and prevent the attack’s spread through your computer. These are the three steps you should take when things go downhill and you have to scream:., my computer was hacked! May 18, 2017  If appear to be struggling to determine whether your Mac has been hacked, when you have full and complete physical and program access to it. ANY message that you see in email or on the Internet, that tells you your Mac is infected with something is a Blatant LIE. No one can tell that from outside your computer.

You turn on your MacBook and feel that something is wrong: some files have disappeared, or new files were added. You wonder if someone has been watching your computer.

So, how to tell if someone is remotely accessing your MacBook? You need to check your logs, verify that no new users were created, make sure that remote login, screen sharing and remote management are disabled, and no spyware is running on your computer.

First things first. If you suspect that someone is controlling your laptop and if there is a chance that they watching you thru the webcam immediately apply a cover on laptop’s webcam. You can find my favorite webcam covers here.

What is remote access and how is it configured on MacBooks?

There are three ways to access MacOS remotely: allow remote logins from another computer, enable Screen Sharing or allow access by using Remote Desktop. Both ways are legitimate, but if you don’t remember doing any of them you need to know how to turn on and off those possibilities.

Remote login to MacOS

Computers that run MacOS as an operating system can log in to your Mac using Secure Shell (SSH). Steps to enable remote login are the following:

1. Go to System Preferences. You can get there by clicking on the apple icon on the left of the top bar. After you clicked on apple icon you will see a drop-down menu where you should click on System Preferences menu item.
2. Find Sharing folder and double click. Click on Remote Login checkbox on the left.
3. Now you have the option to allow access either for all user or only specific users.

Once Remote Login is enabled then users with access can use SSH to log in and browse your computer’s contents.

Access to Mac screen using Screen Sharing

If you need help from IT to make changes on your MacBook or maybe you are collaborating on a project and want to share your screen you can enable Screen Sharing. Steps to enable as follows:

1. Go to System Preferences.
2. Find Sharing folder and double click. Click on Screen Sharing checkbox on the left.
3. Allow access either for all user or only specific users.

How To Check If Your Computer Got Hacked Machine

Now on another Mac (from which you want to access to your Mac) start Screen Sharing app. You can start it by clicking Command and Space buttons. In a popup form type Sharing and hit Enter. Type your computer name. In my case, I had to type in “dev-pros-MacBook-Pro.local”.

A new window will pop up with the shared screen of another computer. Now you can control the screen.

Remote Desktop with Remote Management

Finally, it is possible to login to a computer with MacOS by enabling Remote Desktop. Steps to enable as follows:

1. Go to System Preferences.
2. Find Sharing folder and double click. Click on Remote Management check box on the left.
3. Allow access either for all user or only specific users.
4. There will be different Sharing options where you can fine-tune the type of access to allow: observe, change settings, delete, copy and even restart the computer.

How To Check If Your Computer Is Hacked Mac

Now you can access this Mac from Apple Remote Desktop – it’s an application you can buy from Apple Store and at the time of writing it’s cost was $79.99.

If your Mac is being monitored, it will show this image (two rectangles) in the top right-hand corner near your computer time:

When that symbol appears, you will be able to tell if you are being monitored. You can also disconnect the viewer by clicking on Disconnect option:

You can also click on “Open Sharing Preferences…” which will open Sharing folder in System Preferences.

Since the question you had was if someone remotely accessing your computer then the chances are that you don’t need any of sharing capabilities mentioned above.

In this case, check all options on Sharing folder under System Preferences to make sure that nobody is allowed to access it and turn off (uncheck) all options.

Verify if new users were created

As we’ve seen already remote login or sharing options require assigning access roles to the local users. If your system was hacked it is very likely that the hacker has added a new user to access it. To find out all users in MacOS perform the following steps:

1. Start Terminal app by either going to Applications and then Utilities folder or clicking Command and Space and typing Terminal in the popup window.
2. In the Terminal window type:

On my laptop it listed dev1, nobody, root and daemon.

If you see the accounts, you do not recognize then they probably have been created by a hacker.

In order to find when the user account was used to log in last time type the following command into the Terminal:
last

For each account, MacOS will list the times and dates of logins. If the login to any of the accounts happened at an abnormal time, it is possible that a hacker used a legitimate account to log in.

Check the logs

It may be useful to check the system logs for any possible access issues.

In order to find a system log, click on Go option in the top menu or simultaneously click Shift, Command and G. In the “Go to Folder” popup type: /var/log and hit Enter.

Now find system.log file and scan for word sharing. For instance, I found following screen sharing log entries:

These were log entries when someone logged in to my system remotely:

Check for spyware

If you are still suspecting that spyware is running on your machine you can use a third party application like Little Snitch which monitors applications, preventing or permitting them to connect to attached networks through advanced rules. Setting up the rules for Little Snitch, however, could be complicated.

One of the common spyware applications is a keystroke logger or keylogger. Keyloggers used to be apps that record the letters you type on the keyboard, but they significantly in last years. Suffice to day that keyloggers can take screenshots every 30 seconds or even track your chat activity, including the messages sent to you.

I believe that keyloggers are much greater security threat because they are easier to install and the powerful features they offer. Check my article about keyloggers here: How to know if my Mac has a keylogger

Security Best Practices

1.Change passwords regularly
One thing you should immediately if you are suspecting that someone is logging to your system is to change your password. And the password should be complex enough so that other people wouldn’t be able to guess it. This means avoiding using things like birthdate, first or last name or relatives, house or apartment number, etc. As a rule of thumb the password must be long enough (8 – 32 characters) and include at least 3 of the following character types:

• Uppercase letter (A-Z)
• Lowercase letter (a-z)
• Digit number (0-9)
• Special characters such as ~!@#$%^&*

2.Enable Security Updates by clicking on “Automatically keep my Mac up to date” in Software Update folder in System Preferences.

3. Install Antivirus. I received a lot of emails where people described suspicious activity on their Macs. I found that in about 60-70% cases, the culprit was malwareand not someone breaking into the computer. It’s a myth that Macs don’t get viruses. If you need proof check the next article I wrote after testing 12 antivirus programs after injecting 117 malware samples on my Mac:

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It can be difficult to detect a hacker on a computer because the hacker will hide or disguise their actions. Below are the most common things that you may notice after a computer is hacked.

It is very difficult, if not impossible, to determine who hacked a computer or detect who is actively hacking a computer.

Most computer problems are not caused by computer hackers. It is more common for a computer to be hijacked by a virus than to be hacked.

New programs installed

In some situations, you may see new programs or files on the computer. If you are the only user on the computer and new programs are installed, this could be an indication that it was hacked. However, there are also several legitimate reasons why a new program may appear on the computer, as listed below.

• Operating system or other program received updates that included new programs or files.
• When you installed a new program, other programs may be installed with it. For example, it's common for plugins and other free programs to have a check box verifying the installation of a new toolbar or antivirus program. If you don't uncheck these boxes, the additional new programs are installed.
• If you suspect someone may have used your machine, ask if they installed a new program.

Below is a listing of programs that may indicate a hacker was on the computer.

• Backdoors and trojans are by far the most common programs installed on a computer after it is hacked. These programs can allow the hacker to gain access to a large amount of information stored on your computer.
• IRC clients are another common way for a hacker to get into a computer or remotely control thousands of computers. If you have never participated in an IRC chat and have an IRC client your computer may have been hacked.
• Spyware, rogue antivirus programs, and malware might be an indication of a hacker. More commonly, however, they are a sign that your computer was infected via download or visiting a hijacked page while on the Internet.

Computer passwords have changed

Online passwords

Sometimes, after an online account is hacked, the hacker changes the password to one or more accounts. Try using the forgot password feature to reset the password. If your e-mail address has changed or this feature does not work, contact the company who is providing the service. They are the only ones who can reset your account and give control back to you.

Local computer password

If your password to log into your computer has changed, it may have been hacked. There is no reason why a password would change on its own.

E-mail spam being sent

When an e-mail account is taken over, the attacker often uses that account to spread spam and viruses. If your friends, family, or coworkers are receiving advertising e-mail from you, your e-mail may be compromised. Log into your e-mail account and change your account password.

E-mail addresses can also be spoofed without hacking the account. After changing the e-mail password, if your friends continue to get e-mails you have not sent, it is likely someone is spoofing your e-mail address.

Increased network activity

For any attacker to take control of a computer, they must remotely connect to it. When someone is remotely connected to your computer, your Internet connection will be slower. Also, many times after the computer is hacked, it becomes a zombie to attack other computers.

Installing a bandwidth monitor program on the computer can help determine which programs are using bandwidth on your computer. Windows users can also use the netstat command to determine remote established network connections and open ports.

However, there are multiple legitimate reasons why your Internet connection may also be slow.

Unknown program requesting access

Computer security programs and firewalls help restrict access for security purposes. If the computer prompts for access to programs you do not know, rogue programs may be installed or it may have been hacked. If you do not know why a program needs access to the Internet, we recommend blocking access to that program. If you later discover these blocks cause problems, they can be removed.

A firewall prompting you for access may also be someone trying to probe your network, looking for open or available ports.

Security program uninstalled

If the computer's antivirus program, anti-malware program, or firewall was uninstalled or disabled, it can also be an indication of a hacked computer. A hacker may disable these programs to help hide any warnings that would appear while they are on your machine.

It is also possible for a virus to disable the antivirus program or malware to interfere with the anti-malware program.

Computer is doing things by itself

If your computer is deeply exploited, it's possible for a malicious third-party to remotely control your computer, executing any programs that you have privilege to run. If they are controlling your current login session, they can even control the computer as if they were sitting at your desk, using your keyboard and mouse.

For example, a mouse cursor could be moved or something could be typed. If you see the computer doing something as if someone else is in control, your system is likely being exploited at the root level.

Internet browser homepage changed or new toolbar

If you notice that your web browser configuration has suddenly changed, this may be a symptom of virus or malware infection. Examples of sudden browser changes include your homepage changing, a third-party toolbar being added, or your default search engine changing to something you don't want.