Traditional virus – damages data by wiping out or altering Worms – First worm was created by Robert Morris on Nov. 2, 1988. He was a grad student at Cornell. According to Morris, it was written to guage the size of the Internet, not to cause damage. Now he is an associate professor at MIT. Trojan Horse comes from a Greek story of the Trojan War where the Greeks offered a gift to their enemies, the Trojans, of a giant wooden horse. After the Trojans drag the horse inside their city, Greek soldiers who were hiding inside the horse, sneak out, open the city gates, and allow their fellow soldiers to capture the city of Troy. Email virus – replicates by mailing itself to email addresses in the victim’s address book Melissa Virus – 3/99 – Microsoft Word documents; would send itself to first 50 people in address book; fastest spreading virus ever; caused shut-down of email I LOVE YOU Virus – 5/4/2000 – Trojan Horse distributed via email. Used Visual Basic for Applications (which could do things like modify files and send email as well as auto-execute which allowed the programmer to insert a program into a doc. That runs automatically when the doc is opened). When the attachment was opened it would activate the virus by sending 50 emails and then infect a central file called NORMAL.DOT so any file saved later was also infected.
6 – make sure that Macro Virus Protection is enabled in all Microsoft applications
Free file sharing programs are frequently a major conveyor of adware) Old antivirus software did not scan for adware and spyware because they did not consider them viruses or worms because 1) you give permission to install adware (although you do it unwittingly) and 2) adware does not behave like typical virus or worm since it doesn’t actually do damage other than affecting performance Pop-up blockers to prevent adware and spyware: MSN Toolbar and Google Toolbar To check your computer: use a scanner – software specifically designed for detecting adware and spyware and helping you to remove it E.g., Ad-aware from Lavasoft