Leave any devices that you think may have been affected powered on.
The most obvious sign of being hacked is a message, email, or popup claiming to be from a hacker. The hacker will usually tell you that they’ve compromised you and then provide some form of evidence. This will then be followed by some sort of demand, often money in the form of a cryptocurrency payment.
If your credentials for an account refuse to work, it’s often a sign of malicious activity. This can indicate that hackers have accessed your account and have already changed the login credentials.
Hackers will often use compromised accounts to send nefarious emails and personal messages on social media. This is often done to spread malware and ransomware through “trusted” channels.
Key signs of hacker activity include a changed home page when you launch your browser, unexpected website redirects, and otherwise unusual behavior while browsing the web.
If your computer is constantly slow and working at full capacity, that could be a subtle sign of a malware intrusion. Does the mouse cursor move by itself or applications open and close without you doing anything? Are some things, such as your antivirus, suddenly disabled?
Webcam hacking is very common. If you notice your webcam is active when it shouldn’t be, this is a definite sign of intrusion. (Be sure to cover the webcam while you determine the cause of the problem.)