1 / 19

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.

jada
Télécharger la présentation

ITS220 – How To Prevent Your PC From Infected by Virus

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related