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ITS220 – How To Prevent Your PC From Infected by Virus

ITS220 – How To Prevent Your PC From Infected by Virus. ITS220 – How To Prevent Your PC From Infected by Virus. presented by Desmond Ho. Objectives. Introduce ways of virus attacks. Suggest the good practice of using your computer and the Internet.

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ITS220 – How To Prevent Your PC From Infected by Virus

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  1. ITS220 – How To Prevent Your PC From Infected by Virus ITS220 – How To Prevent Your PC From Infected by Virus presented byDesmond Ho

  2. Objectives • Introduce ways of virus attacks. • Suggest the good practice of using your computer and the Internet. • Introduce prevention methods for protecting your PC from virus attacks. • Advice when the computer is getting infected.

  3. What is virus? A program written intentionally to enter a computer without the user's permission or knowledge. Virus continues to spread, replicate itself and causes serious damage or affects program and system performance.

  4. Different ways of virus attacks • Trojan horse • Email attachment • Macros E.g. MS Word, MS Excel • Visiting websites • Network attacks E.g. DDOS

  5. How to prevent virus? • Install anti-virus software. • Update virus signature regularly. • DO NOT VISIT suspicious web sites. • DO NOT DOWNLOAD un-trusted software from Internet. • DO NOT EXECUTE files from doubtful origins. • DO NOT OPEN an e-mail attachment unless you know who sent it. • DO NOT OPENor FORWARD suspicious emails, delete them immediately. • Regularly back-up your files.

  6. Helping hands • Anti-Virus • External firewall • Hardware router • Anti-virus appliance, Intrusion detection system, Intrusion prevention system • Personal firewall • Anti-Spyware • Anti-Spam

  7. 1. Anti-Virus • Commercial anti-virus software • Mcafee, Norton, Trendmicro • Free anti-virus software • http://free.grisoft.com/freeweb.php/doc/2/ • http://www.free-av.com/ • Online anti-virus scanner • http://housecall.trendmicro.com/ • http://us.mcafee.com/root/mfs/default.asp?cid=9914 • Remember to turn on the automatic update feature.

  8. 2. External firewall • Hardware based firewall can fine control the Internet traffic flowing to and fro your computer. • Require expertise to setup. • Usually employed in corporate environment.

  9. 3. Personal firewall • Use personal firewall to hide your computer from Internet outlaws. • Windows XP internal firewall • Free ZoneAlarm http://www.zonelabs.com • Norton Personal firewall

  10. 4.1 Anti-Spyware • International Data Corp. reported 67% of all computers are infected with some form of spyware in 2004. • Spyware is the 4th-greatest threat to a network security.

  11. 4.2 Anti-Spyware • Spyware, also known as adWare, malware secretly gathers information and relays it back to advertisers or hackers. • They can track your surfing habits, hijack your browser start page, alter important system files. • Spyware infects a computer through a virus or through the installation of new software.

  12. 4.3 Anti-Spyware • Functions of anti-spyware • Block pop-up ads • Remove back doors • Guard against unknown program entrance

  13. 4.4 Anti-Spyware Free anti-spyware • http://www.lavasoftusa.com/support/download/ • http://www.microsoft.com/athome/security/spyware/software/default.mspx

  14. 5.1 Anti-Spam • Spam, the unwanted junk email that clogs up your email account, affects nearly everyone daily. • Self defined keywords filtering • DNS Blacklist

  15. 5.2 Anti-Spam • Consider using an Internet service provider or an email service that includes anti-virus and spam filtering as your first line of defense. • E.g. hotmail, yahoo mail

  16. 5.3 Anti-Spam • Support POP3 • Free: • http://www.spampal.org/ • Commercial: • http://www.symantec.com/

  17. Ways to detect virus infection • Watch out for changes in machine behaviour. • Scan the hard disk with an anti-virus software. • Employ server-based anti-virus software to protect the network.

  18. What to do if infected? • Stop using the infected machine (and it should be detached from the network). Continuing the use of the infected machine help the suspected virus spread further. • Recover from backup is the most secure and effective way to recover the files. • In case you do not have the latest backup of files, you may try to remove the virus using anti-virus software.

  19. Reference web sites • http://www.hkcert.org/ • http://windowsupdate.microsoft.com

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