#Automatic replication. When you run an infected program, the virus also runs, searching your computer for other programs to infect.
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#Automatic replication. When an infected program is run, the virus also runs, searching the host computer for other programs to infect.
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#By email. When email software is configured to run programs attached to messages, the virus asks your email software to send it to recipients in your address book.
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#By email. When email software is configured to run scripts or programs attached to messages, the virus asks the email software to send it to recipients in the user's address book.
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#Misleading advertising. A "Trojan Horse" is a program which seems useful, but contains a virus. The main program may or not perform as advertised, but the distributor knows it is infected.
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#Misleading advertising. A "[[Trojan Horse (malware)|Trojan Horse]]" is a program which seems useful, but contains a virus (or other malware). The main program may or not perform as advertised, but the distributor knows it is infected. A Trojan Horse carried virus typically does not replicate itself but is spread when the user copies the program.
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A virus which infects networks is called a "worm".
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A Trojan Horse virus typically does not replicate itself but is spread when you copy the program.
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A virus which infects networks is called a "worm".