It’s very difficult to provide a list of characteristic
symptoms of a compromised computer because the same symptoms can also be
caused by hardware and/or software problems. Here are just a few
examples:
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Your computer behaves strangely, i.e. in a way that you haven’t seen before.
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You see unexpected messages or images.
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You hear unexpected sounds, played at random.
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Programs start unexpectedly.
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Your personal firewall tells you that an application has tried to connect to the Internet (and it’s not a program that you ran).
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Your friends tell you that they have received e-mail messages from your address and you haven’t sent them anything.
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Your computer ‘freezes’ frequently, or programs start running slowly.
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You get lots of system error messages.
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The operating system will not load when you start your computer.
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You notice that files or folders have been deleted or changed.
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You notice hard disk access (shown by one of the small flashing lights) when you’re not aware of any programs running.
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Your web browser behaves erratically, e.g. you can’t close a browser window.
http://www.kaspersky.com/symptoms
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