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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Virus Protection for Windows.
The virus starts propagating, that is multiplying and replicating itself. It may be possible to recover copies of essential user data by booting from a live CDor connecting the hard drive to another computer and booting from the second computer’s operating system, taking great care not to infect that computer by executing any infected programs on the original drive. Advanced Data Mining and Applications: Indonesia Bahasa – Bahasa.
The virus program is idle during this stage. InFred Cohen published a demonstration that there is no algorithm that can perfectly detect all possible viruses.
The interception can occur by code injection of the actual operating system files that would handle the read request. For this reason, many viruses attach themselves to executable files that may be part of legitimate programs see code injection.
Each infected program will now contain a clone of the virus, which will itself enter a propagation phase. This life cycle can be divided into four phases:.
Sprječavanje i uklanjanje virusa i drugog zlonamjernog softvera
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. One method of evading signature detection is to use simple encryption to encipher encode the body of the virus, leaving only the encryption module and a static cryptographic key in cleartext which does not change from one infection to the next.
Before computer networks became widespread, most viruses spread on removable mediaparticularly floppy disks. Different antivirus programs will employ different search strings, and indeed different search methods, when identifying viruses.
Volume 1, The Basic Technologies. The first one to appear on the Commodore Amiga was a boot sector virus called SCA viruswhich was detected in November Lecture Notes in Computer Science. The term computer virus, coined by Fred Cohen inis a misnomer. Secondly, every computer virus must contain a routine to copy itself into the program which the search routine locates.
The majority of active malware threats are actually trojan horse programs or computer worms rather than computer viruses. The virus will eventually be activated by the “trigger” which states which event viruusi execute the virus, such as a date, the presence of another program or file, the capacity of the disk exceeding some limit or the user taking a certain action e.
Most security software relies on virus signatures, or they employ heuristics. Because those files have many empty gaps, the virus, which was 1 KB in length, did not add to the size of the file.
Computer Viruses and Malware. Phishing is a deception in which the malicious individual pretends to be a friend, computer security expert, or other benevolent individual, with the goal of convincing the targeted individual to reveal passwords or other personal information. That is, each infected file contains a different variant of the virus. Different antivirus programs use different “signatures” to identify viruses.
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. Not to be confused with computer worm or Trojan horse computing. Timeline of notable computer viruses and worms. This way, if data is lost through a virus, one can start again using the backup which will hopefully be recent.
Retrieved November 28, A dormant virus moves into this phase when it is activated, and will now perform the function for which it was intended. In the s, as computers and operating systems grow larger and more complex, old hiding techniques need to be updated or replaced. Virus Test Center, University of Hamburg. Just like regular encrypted viruses, a polymorphic virus infects files with an encrypted copy of itself, which is decoded by a decryption module.
Archived from the original on September 7, A memory-resident virus or simply “resident virus” installs itself as part of the operating system when executed, after which it remains in RAM from the time the computer is booted up to when it is shut down. Anti-keylogger Antivirus software Browser security Internet security Mobile security Network security Defensive computing Firewall Intrusion detection system Data loss prevention software.
In contrast, a non-memory-resident virus or “non-resident virus”when executed, scans the disk for targets, infects them, and then exits i. Archived from the original on July 4, 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.
Some viruses employ polymorphic code in a way that constrains the mutation rate of the virus significantly.
Wikimedia Commons has media related to Computer viruses. New Zealand – English. This is the actual work of the virus, where the “payload” will be released.