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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A better term would be “search strings “.
Retrieved June 21, Secondly, every computer virus must contain a routine to kompjutesrki itself into the program which the search routine locates. Although most of these viruses did not have the ability to send infected email messagesthose viruses kmopjuterski did take advantage of the Microsoft Outlook Component Object Model COM interface.
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.
Microsoft’s System File Checker improved in Windows 7 and later can be used to check for, and repair, corrupted system files. Antivirus software does not change the underlying capability of hosts to transmit viruses. On page one of Dr Solomon’s Virus Encyclopaediathe undesirability of viruses, even those that do nothing but reproduce, is thoroughly explained.
Inresearchers created and released a virus for Linux—known as ” Bliss “. Personal computers of the era would attempt to boot first from a floppy if one had been left in the drive. Archived from the original on vjrusi June 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.
Computer virus – Wikipedia
To avoid being detected by emulation, some viruses rewrite themselves completely each time they are to infect new executables. United States – English. An article that describes “useful virus functionalities” was published by J. Security software can then be used to check the dormant operating system files.
Sprječavanje i uklanjanje virusa i drugog zlonamjernog softvera
In this case, a virus scanner cannot directly detect the virus using signatures, but it can still detect the decrypting module, which still makes indirect detection of the virus possible.
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New Zealand – English. Shareware and bootleg software were equally common vectors for viruses on BBSs.
Just like regular encrypted viruses, a polymorphic virus infects files with an encrypted copy of itself, which is decoded by a decryption kompjutegski. Many Windows users are running the same set of applications, enabling viruses to rapidly spread among Microsoft Windows systems by targeting the same exploits on large numbers of hosts.
Archived from the original on 20 December Antivirus Tools and Techniques for Computer Systems. Archived from the original on 14 December Most of these viruses are written in the scripting languages for Microsoft programs such as Microsoft Word and Microsoft Excel and spread throughout Microsoft Office by infecting documents and spreadsheets.
Unlike Windows users, most Unix users do not log in as an administrator, or “root user”except to install or configure software; as a result, even if a user ran the virus, it could not harm their operating system. While Linux and Unix in general have always natively prevented normal users from making changes to the operating system environment without permission, Windows users are generally not prevented from making these changes, meaning that viruses can easily gain control of the entire system on Windows hosts.
Real World Linux Security: Archived August 4,at the Wayback Machine. Retrieved September 4, Uses authors parameter link CS1 maint: The majority of active malware threats are actually trojan horse programs or computer worms rather than computer viruses.
United Kingdom – English. The user can then delete, or in some cases “clean” or “heal” the infected file.
Retrieved 24 July These viruses modify their code on each infection. Retrieved June 10, Wikimedia Commons has media related to Computer viruses.
Virus Protection for Windows.