These notes provide some background, history, and further information. The worst thing about a computer virus is that they can spread from one computer to another, either via use of infected floppy disk, or over a. Logical addressing, internetworking, tunneling, address mapping, icmp, igmp, forwarding, unicast routing protocols, multicast routing protocols. A computer virus is a type of computer program that can replicate itself by making copies of itself by making copies of itself without the users knowledge or consent. Computer viruses generally work by altering files that contain otherwise harmless programs. It is a worm that spreads itself using different methods. Notes and presentation over the nature of viruses intended for biology students. Disappointed by computer piracy, they wrote the first computer virus, a boot sector virus called brain. Introduction to viruses what is a virus it is a program that can enter a computer in many different ways. Raid stands for the redundant array of the independent disk. It is an easy project, but one which requires some basic programming skills, and the desire to write a virus. When an infected program is invoked, it seeks other programs stored in files to. Presence of a dna intermediate in replication of rna viruses 9.
Ecdl icdl computer essentials this module sets out essential concepts and skills relating to the use of devices, file creation and management, networks and data security. All kinds of personal computers such as pcs, macintoshes etc. The computer virus thereby violates the security policy, threatening data and the operation of the system. The computer will not be infected by a virus if the computer is not connected to the outside world. A virus is by definition a computer program that spreads or replicates by copying itself. A computer virus is a type of computer program that, when executed, replicates itself by modifying other computer programs and inserting its own code. You would have observed that instructions have to be fed into the computer in a. The term computer virus is used for a program that has infected some executable software and, when run, causes the virus to spread to other executables. However, this paper does not cover virus prevention and scanning techniques. Lecture normed space pdf notes in computer science. Computer viruses can be classified by type of targeted file, longevity, selfconcealment, and type of virus. This will be the starting point of the defenses discussed in section 5.
The pdf version of the computer knowledge virus tutorial should be. A program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. The purpose of creating a computer virus is to infect vulnerable systems, gain admin control and steal user sensitive data. When this replication succeeds, the affected areas are then said to be infected with a computer virus. Dimitri ivanowski, a russian botanist in 1892 demonstrated experimentally that sap. An authorization mechanism guarantees that users have. Types of computer viruses boot viruses copies the virus code in the boot sector of the disk, this ensures that the virus is always executed and loaded in the memory when the system starts polymorphic viruses infects the system and change its signature before infecting the next system. A file deleting virus is designed to delete critical files which are the part of operating system or data files. H ave you ever thought of creating a computer virus by yourself. So for example, pdf reader that you are using potentially contains a buffer overflow vulnerability, then an attacker can construct a special pdf file to exploit that vulnerability. Whether a file is malicious or not, does not depend on the file extension in this case pdf. Com files, data files such as microsoft word documents or pdf files, or in the boot sector of the. Computer viruses generally refer to programs that unintentionally get into computers, disrupt the normal operation, and cause damage to data and programs 32. Virus attaches itself to files stored on floppy disks, usbs, email attachments and hard disks.
No need to worry, here is a complete tutorial to let you know how to create simple but dangerous notepad virus step by step with an explanation. These programs, or viruses, are special programs in that they can cause unwanted or damaging effects or take advantage of exploits and operating system weakness to cause damage, system instability, or even allow other programs or users to. On this page, you will learn everything you need to know about the types, symptoms, protection, prevention, detection and removal of computer viruses. Computer networks pdf notes free download cn notes. Jul 02, 2016 tags about boot sector virus about partition table virus how many types of computer virus types of computer virus types of computer virus in hindi. A computer virus is a malicious program that selfreplicates by copying itself to another program. This lecture covers viral infection pathways, the structure of viruses, how viruses infect host cells and how our immune system responds. Poliovirus, rabies virus the type of disease murine leukemia virus geographic locations sendai virus, coxsackie virus their discovers epsteinbarr virus how they were originally thought to be contracted dengue virus evil spirit, influenza virus the influence of bad air combinations of the above. There are different types of viruses that cause different damages to information and programs stored on computers. Webjackers hijack web pages and redirect users to other sites.
Adolf mayer described for the first time a disease of tobacco plant. Attributes of a virus educational examples of a virus in perl and python attributes of a worm educational examples of a worm in perl and python some wellknown worms of the past. The effect of a virus is rarely traceable back to its originator, so viruses make attractive weapons for vandals. How to create computer virus in few seconds notepad virus. In the mid fourscore, so caption has it, the amjad brothers of pakistan ran a computer store. A computer virus is an unwanted malicious program designed to cause damage to computers on a large scale. Problems and solutions article pdf available in library hi tech news 297. The term computer virus is widely misused and, worse, misunderstood.
Trojan viruses are downloaded and spread other malicious programs and can remotely control the computer it is downloaded on. This article is the result of several wellknown sources. By downloading infected programs from the internet. Computer viruses from an annoyance to a serious threat. In other words, the computer virus spreads by itself into other executable code or documents. Chapter one introduction to computer computer a computer is an electronic device, operating under the control of instructions stored in its own memory that can accept data input, process the data according to specified rules, produce information output, and store the information for future use1.
Different types of computer viruses computer virus. This lecture covers viral infection pathways, the structure of viruses, how viruses. It is a worm that infects a computer running microsoft iis server. It presents other forms of rogue programs that are similar to computer viruses.
A virus attacks a computer to spread other malware, allows remote control by unauthorized. Apr 29, 2015 virus and anti viruses seminar and ppt with pdf report. The computer gets infected through the replication of malicious code. If a computer is infected with boot sector virus, when the computer is turned on, the virus launches immediately and is loaded into memory, enabling it to control the computer. Viruses hide on a disk and when you access the disk either a diskette or another hard disk over a network the virus program will start and infect your computer. Computer security antiviruses in the previous chapter, we saw how to secure our computers and one of the points was installing and updating antivirus software. It depends on the vulnerabilities in the software which will be parsing it. There are many known techniques that can be used by a virus, and viruses appear on many platforms. Computer viruses encyclopedia of life support systems. A computer virus is a program whose purpose is to cause damage, steal data, take control, andor to spread to other software. Type of targeted file the lehigh virus is of the type boot sector infector because it inserts itself into the boot sector. If this file is copied to a computer, virus is also copied to the computer. A computer virus is one type of malware that inserts its virus code to multiply itself by altering the programs and applications.
Contains either dna or rna surrounded by a protein coat d. A computer virus is a malware program that, when executed, replicates by inserting copies of itself. Like biological ones, computer viruses enter a host through a carrier. This section is dedicated to those who would like to write a virus, but dont have the knowledge to do so. Viruses may occur on almost any computer platform with enough programming capability. A virus is a computer code or program, which is capable of affecting your computer data badly by corrupting or destroying them. It is a virus that is distributed as an email attachment. A computer virus is a computer program that can copy itself and infect a computer. Computer virus has the tendency to make its duplicate copies at a swift pace, and also spread it across every folder and damage the data of your computer system. Computer virus class 10 computer science notes khullakitab. The next section places computer viruses in context. Botnets put infected computers into a network where they can be remotely controlled.
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