Face it, there will always be groups of cybercriminals looking to take advantage of us. We hear of data breaches, malware attacks, ransomware and phishing scams constantly - it seems like we are under attack around the clock. And it's true, online threats never stop.
Don't be shocked, but an unpatched and unprotected PC can get hacked in less than five minutes when connected to the internet!
This means knowing the signs that your gadget is hacked or compromised is critical. Why? Time is of the essence when you're dealing with malware and data breaches and detecting them early enough is key.
Here are the top seven signs that you've been hacked:
1. Your gadget suddenly slows down
Have you ever wondered if you have hidden malicious software lurking within your computer? Maybe at times it is abnormally sluggish, constantly freezing, or you feel that something just doesn't feel right. If you start noticing some of these symptoms, your gadget may very well be infected with viruses, Trojans or worms.
Malicious software usually run in the background, secretly eating up your gadget's resources while it's active.
If your gadget starts struggling to do the most basic tasks and lags or freezes even without any open apps you know of, then hidden malicious software may be churning along quietly, using your device memory and processor resources.
What can you do?
Here are tools you can use to pinpoint those nasty applications. If an application that you don't recognize is hogging your computer resources, it's likely a virus!
PC: Use Task Manager
There are a few ways to see what processes your computer is running. The easiest is to bring up Windows' built-in Task Manager. Just use the keyboard shortcut CTRL + SHIFT + ESC and go to the Processes tab.
Note: Windows 10 and 8 present process information in a much friendlier way than Windows 7 or Vista. If you're on Windows 7 or Vista, you'll probably want to pick up the program Process Explorer.
You'll see the process name, how much of your computer's processing power it's using, how much memory it's hogging and - sometimes - which programs use it.
So where do processes come in handy? Well, your computer might be feeling sluggish on a regular basis. Open up Task Manager and check the CPU and memory columns for each process.
You might find one process is using 100 percent - or close to it - of your CPU for a long period of time. Open up the program associated with the process and see what it's doing.
If it doesn't appear to be doing anything, restart it and keep an eye on it for a while to see if it starts hogging your processor again.
Mac: Use Activity Monitor
To view open processes and computer resources usage on a Mac, use the Activity Monitor.
To quickest way to access the Activity Monitor is by using Spotlight Search.
Click the magnifying glass on the right side of the menu bar at the top of your screen, or press Command + Spacebar to open a Spotlight window and start typing the first few letters to auto-complete "Activity Monitor." Just press enter to access the tool.
Another way of accessing the Activity Monitor is through the Launchpad. The Activity Monitor is in the "Other" folder. Optionally, you could then drag its icon to the dock for easy access in the future.
Similar to Window's Task Manager, Mac's Activity Monitor displays a list of all your open processes with tabs for CPU, Threads, Idle Wake Ups and Network usage.
If this happens when you are on an iPhone, try a soft reset by holding the power and the home button until it reboots with the Apple logo. This can clear out frozen apps that can be hogging your memory.
On Android, try rebooting as well, or better yet, boot into safe mode to troubleshoot any errant apps.
If resetting your device doesn't resolve the high resource usage, then there's a high probability that your phone is infected.
2. You’re using more data than usual
One thing you will notice if your gadget has been hacked is an unexpected increase in data usage. Every internet provider has tools that can keep track of your monthly bandwidth consumption.
Look under Data Usage Meter or Data Monitor, depending on your provider.
Now, compare the amount of data used for data usage from the prior months and if you notice sudden spikes in your data activity even though you haven't really changed your patterns, then chances are you are infected.
For example, adware infected gadgets usually perform unsolicited clicks in the background to generate profit for cybercriminals.
All of these stealthy tactics use up bandwidth and the unauthorized data they consume should be fairly easy to spot.
3. Videos are suddenly buffering and webpages take forever to load
We've all seen this happen one way or another - we're tucked cozily on our favorite sofa, hoping to binge-watch a show on our favorite streaming service.
Then it happens ... the dreaded buffering circle rears its ugly head again.
So you check your internet speeds. Uh oh. Webpages are slow to load, surfing the net comes to a crawl. What's wrong? The problem could be with your internet service or maybe your router simply needs a reboot.
However, it might be something more malicious. Your neighbors or another unknown party could be on your network using your bandwidth.
Or maybe a virus is redirecting your web traffic or hogging your internet connection. One way malware can slow down your internet traffic is by DNS hijacking.
What these clever hackers do is insert rogue DNS servers so your traffic is directed to unsafe servers instead of the secure servers your internet service provider gives you. This will not only slow down your browsing experience, it's a serious security risk, as well.
For example, if your router's DNS settings have been hijacked, each time you visit your online bank's website, you'll be redirected to a phishing website instead.
4. Programs and apps start crashing
Now, here is a definite symptom that your system has been severely infected. If your antivirus software and task manager are either crashing or disabled, then a nasty virus has already taken hold of your critical system files.
If your gadget is compromised, you may not be able to click on the apps that you rely on every day. Or, if you've been hit by ransomware, you may not be able to open files you regularly use. It's frustrating and a little scary.
You can try and fix the problem by booting your gadget in Safe Mode. With Safe Mode, your computer will be running with just the bare essentials.
This way, you can safely delete and uninstall any programs and files that you can't during normal operation.
On Windows, search for System Configuration then open it >> select Boot tab then tick off Safe Boot >>check Minimal (this is enough for most cases) >> click on OK to confirm >> Restart your computer.
On a Mac, press and hold down the Shift key while restarting your computer. Keep holding the key through the Apple logo and release when you see the login screen.
Android also has its own version of Safe Mode but there are different ways to activate it, depending on your phone model.
Stock iOS doesn't have a Safe Mode but you can try a soft reset to fix most issues. To do this, press and hold both your iPhone's Home button and the Sleep button at the same time, wait for it to restart then let go of the buttons when the Apple logo is displayed.
The iPhone X and beyond don't have a Home button so the process is a bit different.
Press and quickly release the volume up button, press and quickly release the volume down button then press and hold the side button and release when the Apple logo appears.
If attempts to fix the issues in Safe Mode fail, it may be time for a complete restore so you can start fresh. If you're recovering from a serious malware infection, starting from scratch is the only way to go.
5. You start seeing pop-up ads
If you're starting to get annoying pop-up ads and notifications, unwanted reminders and nagging "system" warnings that just won't go away, then your gadget may have been compromised.
Malware can also add bookmarks that you don't want, website shortcuts to your home screen that you didn't create and spammy messages that entice you to click through.
Apart from slowing down your gadget and eating away at your data, these intrusive notifications can also install more malware on your system.
Criminals can also use DNS hijacking to modify the ads that you see while browsing. Instead of the regular ads that you should be getting, they can be replaced with inappropriate or malicious ones.
This opens you up to a whole world where all your personal information is vulnerable and your system's chances of getting infected with malware go up.
6. Your gadget suddenly restarts
Automatic restarts are part of normal computer life. For example, software updates and new application installs can prompt you to reboot your computer. Your system will always warn you when these happen, though, and you can delay or postpone them if you desire.
Sudden restarts are a different story. If your computer randomly shuts down or reboots while you're in the middle of an activity, then it's definitely a sign that something's amiss.
It could be a buggy application that's crashing, faulty hardware or, you guessed it, a virus lurking in the background.
With Windows 10, there's a free malware detection and extraction program called Microsoft Windows Malicious Software Removal Tool.
A Full Scan with this tool is a recommended method if you want to verify that the tool is updated with the latest malware definitions or if you want to have a more thorough system scan.
7. Things are happening you had no part of
This is what hackers covet the most - your usernames and passwords. These, coupled with social engineering tricks, can gain access to your banking accounts, your social media profiles, and your online services.
Keep an eye on your email's "sent" folder and on your social network posts. If you notice emails and posts that you don't remember sending or posting, it's likely that you have been hacked.
Constantly check your accounts for unauthorized activity - movies on your Netflix profile that you don't remember streaming, mystery purchases that you haven't made, songs on your Spotify that you didn't listen to, credit card charges that came from nowhere - if something's amiss, report it immediately.