Malware and human disease thrive on silence and invisibility. If the tiniest cancer cell gave you a polka-dot face, you'd seek treatment immediately, and you'd probably be OK, because the evil invader would never have a chance to spread. Similarly, malware infections are best caught early, before they can spread and do terrible damage. If malware signposted its arrival by slapping "You've been malwared!" across your monitor, you'd download a tool to blitz it, and then get on with your life. But hackers don't want you to know you've been hacked. They create silent imposters that can lurk in your system for years, stealing your bank details, passwords and other sensitive data while you're blissfully unaware. Even ransomware can fester silently in your PC before it splashes a ransom demand on your screen.
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