Addisonwesley, 1990 cert coordination center web site antivirus online ibms site title. Viruses can, of course, override dac permissions mac can stop viruses if and only if the user cant overwrite his own executables. Each copy of the worm has new code generated on the fly using functionality equivalent instructions and encryption techniques. Computer science and engineering computer viruses matt bishop.
Studying and classification of the most significant malicious. Henric johnson 25 definitions virus code that copies itself into other programs. Serves as a clearinghouse for information on new viruses, worms, and other computer security topics. Unless you havent read a newspaper or watched the news in. Other malicious programs are logic bombs, trojan horses, and worms. As internet connectivity grows, the ease with which computer viruses can spread also grows. Pdf computer viruses, worms, data diddlers, killer programs, and other threats to your system. Chapter 9 intruders and viruses henric johnson blekinge institute of technology. Computer security risks while some breaches are accidental, many are intentional.
Viruses and worms are malicious programs that selfreplicate on computers or via computer networks without the user being aware. A computer virus is a program, script, or macro designed to cause damage, steal personal information, modify data, send email, display messages, or some combination of these actions. Each type of virus has its own separate factors and means of infiltrating your hard drive which makes them different from each other. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Some are only included or alluded to because they were in the previous edition. Worms tend to harm the network by consuming network bandwidth where viruses infect or corrupt files on the targeted computer. Attacks with names like sql slammer, code red, and nimda have even appeared on the evening news. Viruses are not the only type of programs that are written solely to cripple computer systems or to use a computer in an unauthorized way. Worms and viruses university of california, berkeley. Specific object, person who poses such a danger by carrying out an attack ddos attacks are a threat if a hacker carries out a ddos attack, hes a threat agent. Past, present, and future craig fosnock cissp, mcse, cne east carolina university abstract. This guide to materials about computer crime and security updates and replaces tb 854. There are many different types of computer viruses and worms that can infect your hard drive and pc.
Viruses, trojan horses, and worms columbia university. An intentional breach of computer security often involves a deliberate act that is against the law. The virus tends to damage, destroy or alter the files of target computers, whereas, worms does not modify any file but aims to harm the resources. It includes computer viruses, worms, trojans, spywares, and other programs. Removable media viruses floppies, cddvd roms, usb driveskeys files on shared servers and p2p networks wormsviruses have to convince user to click to open or, an infected existing document email file attachments viruses have to convince user to click to. Selfreplicating computer program that uses a network to send copies of. Protecting your computer and your identity michigan. Addisonwesley, 1990 cert coordination center web site.
An estimated 50,000 computer viruses provide a variety of effects ranging from the merely unpleasant to the catastrophic. Not meant to be a comprehensive bibliography, this tracer bullet is designed as the name of the series implies to put the reader on target. Some intruders do no damage, and merely access data. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. They attack all platforms and are written in all popular computer languages. Intruders and viruses intruders and viruses henric johnson blekinge institute of technology. They are even capable of affecting the biggest network of our time, the internet. Scribd is the worlds largest social reading and publishing site. This collection of papers discusses aspects of computer viruses and related programs.
Just like viruses, computer worms are still around, raising just as much havoc as before. To replicate, viruses need humans to send them through emails, messages, attachments, etc. In contrast to viruses, which require the spreading of an infected host file, worms are standalone software and do not require a host program or human help to propagate. How to protect your computer from viruses and trojans. Pdf computer viruses, worms, data diddlers, killer.
The primary difference between a virus and a worm is that viruses must be triggered by the activation of their host. Difference between virus and worms with comparison chart. Note that computer viruses are also found on macintoshes and. Computer virus, worm and trojan horse study regular. Article information, pdf download for viruses, worms, and trojan horses. Intruders and viruses henric johnson blekinge institute of technology, sweden. In general, malwares include worm, botnet, virus, trojan horse, backdoor, rootkit. How viruses, worms, and trojans work 1 how viruses, worms and trojans work in order to deal with viruses, worms and trojans, you have to understand them. Intruders and viruses in network security ns9 slideshare. Ch5 intruders virus firewall file transfer protocol. Second, 7 articles in hoffman are concerned with fighting network viruses and, while much of the denning material is relevant to personal computers, the expressed main concern of the editor is also the protection of computer networks from intruders that is, 7 pieces deal with worms andor the internet worm in particular. Computer security is about much more than viruses and worms. When the virus is executed, it spreads by copying itself into or over data files, programs, or boot. The following is a list of articles, books, and web pages related to the subject of computer viruses.
Computer viruses, worms, data diddlers, killer programs, and other threats to your system. Weakness or fault that can lead to an exposure threat. Worms use computer networks to spread itself while viruses spread to different systems through executable files. The arrival of internet worms internet worms date to nov 2, 1988 the morris worm way ahead of its time modern era begins jul, 2001 with release of initial version of code red exploited known buffer overflow in microsoft iis web servers on by default in many. Unfortunately, when battling viruses, worms and trojans, a hardware firewall may be less effective than a software firewall, as it could possibly ignore embedded worms in out going emails and see this as regular network traffic. Detection systems catch intruders in the act minimize the impact of intruders. Problems and solutions article pdf available in library hi tech news 297. Viruses spread when the software or document they are attached to is transferred from one computer to another using the network, a disk, file sharing, or infected email attachments. Computer viruses and worms computer viruses and worms referred to s by dragan lojpur, zhu fang at florida state university definition of virus a virus is a small piece of software that. The difference between a virus, worm and trojan horse. Download computers under attack intruders worms and viruses free books. Ssl, tls and secure electronic transactions intruders, intrusion detection, password management malicious software types, viruses, virus countermeasures, worms, firewalls characteristics, types of firewalls. One of the most widely known terms for code with unwanted behavior is computer viruses.
Protecting your computer and your identity security awareness. Ch5 intruders virus firewall free download as powerpoint presentation. As such, unix system administrators are faced with prospects of subtle, dif. Computer worms are similar to viruses in that they replicate functional copies of. Generic term for objects, people who pose potential danger to assets via attacks threat agent. Some outdated links and unobtainable references have been removed, and. Highspeed connections cable and dsl are the only two connections intruders attack. The morris worm was one of the first computer worms distributed via the internet. First, i defines viruses and other types of malevolent software such as. This study examines the functionality and propagation patterns of computer viruses, worms, and trojan horses detected during a 12month period beginning on january 1, 2004.
Threats and attacks computer science and engineering. Ppt viruses and worms powerpoint presentation free to. You read about these threats in the papers almost every day. Network security intruders, malware, firewalls, and. Logic bombs trojan horses viruses bacteria worms malicious programs. Intruder is a person who enters in territory that does not belongs to him.
Internet computer worms have gone from a hypothetical theorem to very real and very dangerous threat to computer networks. A computer worm is a program that copies itself from one computer to another computer. The term computer virus was used as early as in the 1980s 8 and has come to represent a piece of code that. Also explain logical bomb and trojan horse given the difference between viruses and worms.
Heuristic tests help you to keep up with new viruses that havent been defined yet. For individual home users, the most popular firewall choice is a software firewall. With malicious programs like spyware and trojan horses on the steady incline, others tend to fall out of discussion while remaining prominent and quite dangerous. Documents that are allowed to contain macros such as pdf. Pdf malware, short term for malicious software, is a software which is developed to penetrate.
An important distinction between computer viruses and worms is that viruses require an active host program or an alreadyinfected and active operating system in order for viruses to run, cause damage and infect other executable files or documents, while worms are standalone malicious programs that. What they are, how they work, and how to defend your pc, mac, or mainframe john. The first describes the emergence of a worldwide network of computers, here called worldnet, and the practices that. Computer worms are similar to viruses in that they replicate functional copies of themselves and can cause the same type of damage.
62 873 1179 612 917 1595 355 1633 194 91 1462 218 485 847 1001 735 68 913 248 842 775 1697 508 437 82 546 986 1019 401 91 238 727 470 167 904