Viruses, Malicious Code,amp; Other Nasty Stuff.ppt

Viruses, Malicious Code, Other Nasty Stuff Presented by: Melissa Dark K-12 Outreach Coordinator CERIAS, Purdue University dark@ 765.496.6762 /education/K-12 Software Security:(Viruses, Trojans, Unwanted Access) Only install necessary and trusted software. Beware of *free* games, screen savers, and graphics. Keep a hard copy of the copyright release for all “free” products! Run and UPDATE anti-virus software!! 1988: Less than 10 known viruses 1990: New virus found every day 1993: 10-30 new viruses per week 1999: 45,000 viruses and variants Source: McAfee Examples of Nasty Stuff: Trojan Horse Viruses Worms Logic Bomb Trapdoors Viruses: Viruses: a computer program file capable of attaching to disks or other files and replicating itself repeatedly, typically without user knowledge or permission. . ...what if the Greek soldiers in the Trojan Horse had the plague?? Worms: Worms: reproducing programs that run independently and travel across network connections. Reproduction Differences: * A virus is dependent upon a host file or boot sector, and the transfer of files between machines to spread. * A worm can run completely independently and spread of its own will through network connections. Trojan Horse: Trojan Horse: a malicious program that pretends to be a benign application; a Trojan horse program purposefully does something the user does not expect. Trojans are not viruses since they do not replicate, but Trojan horse programs can be just as destructive. Logic Bomb: Logic Bomb: A logic bomb is a type of Trojan Horse that executes when specific conditions occur. Triggers for logic bombs can include change in a file, by a particular series of keystrokes, or at a specific time or date. Trapdoor: Trapdoors: allows access to a system by skipping the usual login routine. Mattel Example... Virus Information Activity(for students or teachers) Directions: Choose one of the keywords listed on the next slide. Go to the McAfee