Computer Protection and Network Security

• Virus – Malicious program that spreads via an infected ‘host’ file.
• Worm – Malicious program that spreads without requiring an infected ‘host’ file.
• Trojan Horse – Malicious program that doesn’t spread automatically.
• Spyware/Adware – Programs that aren’t necessarily directly malicious, but may be undesirable due to collection of personal information.
• Worms.
◦ Email based (Beagle/Bagle, MyDoom).
◦ Network based (Sasser).
▪ Fastest spreading.
◦ Counter-worms (Nachi, Doomhunter).
• Most current worms carry backdoors.
Current Threats
• Trojan Horses.
◦ Keyloggers, backdoors, open proxies/relays, fileservers, scanners.
◦ User tricked during program installation.
Current Threats
• Overt attacks:
◦ “Traditional” attacks – someone trying to retrieve or modify protected information.
◦ “Script-Kiddie” attacks:
▪ Distributed Denial-of-service attacks.
Current Threats
• Spyware/Adware.
◦ Comes along with some software.
◦ Browser hijacking.
▪ Redirects.
• Home Page.
• Search Page.
Why do I need to protect my computer?
• Viruses not only affect you, but they can affect everyone around you.
• Save yourself time and money in the long run and you have a much lower risk of loosing important files.
• Protect yours and your families personal information.
“How do I protect myself?”
• Back up your data files at least once a week.
• Stay current with Microsoft windows and Macintosh critical updates.
• Use security and privacy features built into your software.
• Install a local firewall.
• Install Antivirus software.
• Install spy-ware and ad-ware tools.
• Scan for Trojan horses regularly.
• Use other privacy software to protect your identity.
• Good password management.
Backup you files weekly.
• Use Windows XP.
• Other backup utilities:
◦ Galaxy™ Backup & Recovery
◦ Symantec Norton Ghost
Staying current with Windows patches.
• If you have Windows XP, set you computer to automatically download updates daily.
• Go to and directly download the patches from Microsoft at least once a month.
Use built-in privacy and security tools.
• Many pieces of software have built in security features, USE THEM!
Install a firewall.
• Free:
◦ Windows XP firewall.
◦ Zone...

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