VIRUS

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VIRUS:

V I R U S P RESENTED BY :- Akshit Aggarwal

Full Form of virus:

Full Form of virus Virus Vital Information Resources Seize Under

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What is Computer Virus? A computer virus is a program or a set of programs that disrupts the normal operation of a computer. Virus infects or destroys data. It enters in the computer without the permission or knowledge of the users . Virus program are self-replicating and are continuously expanding their reach by infecting more and more computer files, resulting in loss of speed and destruction of data.

Virus Symptoms:

Virus Symptoms Decreasing the speed of the computer by decreasing the memory. Causing Strange movement or pattern on the screen. Displaying usual message like “Your PC is stoned”. Increasing The use of disk space and growth in file size as the virus gets attached itself to many files. Frequent hanging of the system. Showing abnormal write protect error. Displaying a change in data against the filename in the directory. Reforming the hard disk. Deleting or damaging files

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Types of Virus Trojan Horse Worms Bootsect Virus Macro Virus Memory Resident Viruses Rootkit Virus Polymorphic Viruses Logic Bombs/Time Bombs Virus Malware Spyware Program File Virus

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Program File Virus These virus infects executable files, program such as those with extension like .com, .exe, .olv, .drv, .sys etc. These programs get loaded in the memory during execution. The virus becomes active in memory by replicating itself and infecting files on the disk. Sunday, Cascade, etc are example of program file virus.

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Trojan Horse Trojan Horse are simplest programs that pretend to be useful applications while they always do something destructive. They are not self replicating. A Trojan can spread only when it is copied to another system. The name ‘Trojan Horse’ came from the wooden horse used by the Greek Army to conquer the city of troy.

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Worm A worm is a program that makes and facilitates the distribution of copies of itself; for example, from one disk drive to another, or by copying itself using email or another transport mechanism. The worm may do damage and compromise the security of the computer. It may arrive via exploitation of a system vulnerability or by clicking on an infected e-mail.

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BootsectVirus These Virus infect the boot record or master boot records. They replace the boot record that is responsible for loading the operation system in memory by copying it elsewhere. Boot virus become active at a time of booting the machine. Example are- Disk killer, Stone Virus etc.

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Macro Virus Macro viruses are viruses that use another application's macro programming language to distribute themselves. They infect documents such as MS Word or MS Excel and are typically spread to other similar documents.

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Memory Resident Viruses Memory Resident Viruses reside in a computers volatile memory (RAM). They are initiated from a virus which runs on the computer and they stay in memory after it's initiating program closes. 

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Rootkit Virus A Rootkit virus is an undetectable virus which attempts to allow someone to gain control of a computer system. The term Rootkit comes from the Linux administrator root user. These viruses are usually installed by Trojans and are normally disguised as operating system files.

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Polymorphic Viruses A polymorphic virus not only replicates itself by creating multiple files of itself, but it also changes it's digital signature every time it replicates. This makes it difficult for less sophisticated antivirus software to detect.

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Logic Bombs/Time Bombs Virus These are viruses which are programmed to initiate at a specific date or when a specific event occurs. Some examples are a virus which deletes your photos on Halloween, or a virus which deletes a database table if a certain employee gets fired.

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Malware Malware is made up of two words malicious and software . It is a software that enters into a computer and damages it without the knowledge of the users. Malware is a trouble causing program. It may be a virus, worm, Trojan Horse or Spyware. Malware not only interrupt the normal working of a computer but also steal important information.

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Spyware Spyware is a type of malware that is installed on computers and collects information about users without their Knowledge. Spyware programs secretly monitor the user’s computing. They can collect various types of personal information such as internet surfing habits, visited web pages, and transmits that information in the background to someone else. Sometimes they also change computing setting that results in slow connection speed and wrong functionality of other programs. Spyware can also collect information about e-mail addresses, passwords and even credit card numbers.

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How can prevent your PC from virus? E very PC should be equipped with some anti-virus program. Always scan the pen drive before copying files Do not install pirated software Take the back up of important files everyday. Use internet carefully and e-mail attachments very carefully.

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Antivirus Software Antivirus software are computer programs which are designed to identify, prevent and remove viruses from our computer. They perform the following tasks in our computer. Scan the computer files to look for know viruses matching definitions from virus dictionary. Identify suspicious behavior from any computer program which might indicate infection. Simply installation an antivirus software in our computer does not guarantee 100% protection, as the installed Antivirus program would not be able to detect new virus programs. We should keep on updating our computer with the least version of Antivirus programs. Most of the antivirus software companies provide the facility to download the least updates from their websites.

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How to make Virus? Step 1 Make a new shortcut like this

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Step 2 For the location enter type: shutdown -s –t (# of seconds until shutdown. Ex:50) “(Any message of your choice like :Trojan Virus Activated)” So it should look something like this Click on it Now your virus is ready to destroy your friends computer.

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