The hackers announce themselves by leaving a ransom note on your desktop or changing your desktop wallpaper itself in to a ransom note (see GandCrab). You lose access to your files or your entire computer. This is symptomatic of a ransomware infection.Your antivirus product stops working and you cannot turn it back on, leaving you unprotected against the sneaky malware that disabled it.Causes vary, but this usually means you clicked on that “congratulations” pop-up, which downloaded some unwanted software. Your browser settings change. If you notice your homepage changed or you have new toolbars, extensions, or plugins installed, then you might have some sort of malware infection.The same goes for botnets, spyware, and any other threat that requires back and forth communication with the C&C servers. This could explain the spike in Internet activity. Once a Trojan lands on a target computer, the next thing it does is reach out to the attacker’s command and control server (C&C) to download a secondary infection, often ransomware.
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