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2.  Computer virus have become today’s headline news  With the increasing use of the Internet, it has become easier for virus to spread  Virus show us loopholes in software  Most virus are targeted at the MS Windows OS

3. Þ Virus : A true virus is capable of self replication on a machine. It may spread between files or disks, but the defining character is that it can recreate itself on it’s own with out traveling to a new host.

4.  Background  Symptoms  Classifying Viruses  Examples  Protection/Prevention  Conclusion

5.  There are estimated 30,000 computer viruses in existence  Over 300 new ones are created each month  First virus was created to show loopholes in software

6.  ANSI COBOL  C/C++  Pascal  VBA  Unix Shell Scripts  JavaScript  Basically any language that works on the system that is the target

7.  Computer runs slower then usual  Computer no longer boots up  Screen sometimes flicker  PC speaker beeps periodically  System crashes for no reason  Files/directories sometimes disappear

8.  Today almost 87% of all viruses are spread through the internet (source: ZDNet)  Transmission time to a new host is relatively low, on the order of hours to days.

9.  Trojan Horse  Worm

10.  Covert  Leaks information  Usually does not reproduce

11.  Features of Trojans: ◦ pings and query servers ◦ reboot or lock up the system ◦ display system information ◦ logs keystrokes ◦ server control

12.  Spread over network connection  Worms replicate  First worm released on the Internet was called Morris worm, it was released on Nov 2, 1988.

13.  Features of worms: ◦ requires WSL (windows scripting language), Outlook or Outlook Express, and IE5 ◦ Does not work in Windows NT ◦ Effects Spanish and English version of Windows ◦ 2 variants have been identified ◦ Is a “latent virus” on a Unix or Linux system

14.  How Worms works ◦ worm is embedded within an email message of HTML format. ◦ a VbScript while the user views a HTML page ◦ a file named “Update.hta” is placed in the start up directory ◦ upon reboot worms executes

15.  Knowledge  Proper configurations  Run only necessary programs  Anti-virus software

16. There are three different kind of anti-viral packages:  activity monitors,  authentication or change-detection software, and  scanners. Each type has its own strengths and weaknesses. Commercial anti-viral programs have a combination of the above mentioned functions.

17.  Data Fellows F-Prot Data Fellows F-Prot  EliaShim ViruSafe EliaShim ViruSafe  ESaSS ThunderBYTE ESaSS ThunderBYTE  IBM Antivirus IBM Antivirus  McAfee Scan McAfee Scan  Microsoft Anti-Virus Microsoft Anti-Virus  Symantec Norton Antivirus Symantec Norton Antivirus  S&S Dr S&S Dr Solomon's AVTK. S&S Dr S&S Dr Solomon's AVTK  Bit Defender 2008 Bit Defender 2008

18.  You know know more about virus and how: ◦ viruses work through your system ◦ to make a better virus  Have seen how viruses show us a loophole in popular software  Most viruses show that they can cause great damage due to loopholes in programming