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Viruses or Trojan Horses may cause anomalies on individual PCs and throughout the entire network.
- Viruses can delete files, format disks, and even delete the BIOS from a PC.
- A Trojan Horse may look like a gift or legitimate product (hence the name), but it hides in the background and picks up logins, passwords, system names, directories, etc.
- Trojans like Netbus or Back Orifice 2000 may give an attacker complete access to a host or network.
- ActiveX or JavaScript code from an attacker can cause damage to a host by rebooting the system, taking over the Web browser, or transferring money out of an online banking account.
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