A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the .. Računalni je virus mali softverski program koji se širi s jednog računala na drugo i ometa rad računala. Računalni virus može oštetiti ili izbrisati. Koliko virusi mogu biti opasni, govori i slučaj iz godine kada je kompjuterski virus Staksnet napravio haos u svetu i uspeo da ugrozi i iranski nuklearni.
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Timeline of notable computer viruses and worms. Secondly, every computer virus must contain a routine to copy itself into the program which the search routine locates. Virus Protection for Windows. The first academic work on the theory of self-replicating computer programs  was done in by John von Neumann who gave lectures at the University of Illinois about the “Theory and Organization of Complicated Automata “. The Bliss virus never became widespread, and remains chiefly a research curiosity.
Archived from the original on 29 June Some websites—like Google subsidiary VirusTotal. Archived from the original on 16 March Although most of these viruses did not have the ability to send infected email messagesthose viruses which did take advantage of the Microsoft Outlook Component Object Model COM interface.
Antivirus software does not change the underlying capability of hosts to transmit viruses.
And there’s a clear pattern here which suggests an analogy to an infectious disease process, spreading from one resort area to the next. Such a virus “signature” is merely a sequence of bytes that an antivirus program looks for because it is known to be part of the virus. Resident viruses overwrite interrupt kompjutefski code or other functionsand when the operating system attempts to access the target file or disk sector, the virus code intercepts the request and redirects the control flow to the replication module, kompjutefski the target.
Security software can then be used to check the dormant operating system files. Many websites run by antivirus software companies provide free online virus scanning, with limited “cleaning” facilities after all, the purpose of the websites is to sell antivirus products and services. Infection mechanism also called ‘infection vector’is how the virus spreads or propagates. The program with a personality. Virus Test Center, University of Hamburg.
The triggering phase can be caused by a variety of system events, including a count of the number of times that this copy of the virus has made copies of itself. Archived from the original on 17 December Some viruses spread by infecting programs stored on these disks, while others installed themselves into the disk boot sectorensuring that they would be run when kommpjuterski user booted the computer from the disk, usually inadvertently.
Ina program called ” Elk Cloner ” was the first kompjutersmi computer virus to appear “in the wild”—that is, outside the single computer or [computer] lab where it was created.
The term computer virus, coined by Fred Cohen inis a misnomer. Even home computers were affected by viruses. A virus typically has a search routine, which locates new files or new disks for infection. Computer Viruses and Data Protectionpp.
A virus can hide by intercepting the request to read the infected file, handling the request itself, and returning an uninfected version of the file to the antivirus software. If the recipient, thinking the link is from a friend a trusted source follows the link to vitusi website, the virus hosted at the site may be able to infect this new computer and continue propagating. Some antivirus software blocks known malicious websites that attempt to install malware.
Upper Saddle River, NJ: Because those files have many empty gaps, the virus, which was 1 KB in length, did not add to the size of the file. Retrieved Viruzi 9, This life cycle can be divided into four phases:.
However, antivirus professionals do not accept the concept of “benevolent viruses”, as any desired function can be implemented without involving a virus automatic compression, for instance, is available under the Windows operating system at the choice of the user.
This computer is infected by spyware and adware. Different antivirus programs will employ different search strings, and indeed different search methods, when identifying viruses.
Its creator later posted the source code to Usenetallowing researchers to see how it worked. Many common applications, such as Microsoft Outlook and Microsoft Wordvvirusi macro programs to be embedded in documents or emails, so that the programs may be run automatically when the document is opened.
To enable viruai code, the virus has to have a polymorphic engine also called “mutating engine” or ” mutation engine” somewhere in its encrypted body.
The trigger, which is also known as logic bombis the compiled version that could be activated any time an executable file with the virus is run that determines the event or condition for the malicious ” payload ” to be activated or delivered  such as a particular date, a particular time, particular presence of another program, capacity of the disk exceeding some limit,  or a double-click that opens a particular file.