Virus and Worms

 Virus and Worms

Computer virus is a program that can “infect” legitimate programs by modifying them to 

include a possibly “evolved” copy of itself.

 Viruses spread themselves, without the knowledge or permission of the users, to 

potentially large numbers of programs on many machines.

 A computer virus passes from computer to computer in a similar manner as a biological 

virus passes from person to person.

 Viruses may also contain malicious instructions that may cause damage or annoyance; 

the combination of possibly Malicious Code with the ability to spread is what makes 

viruses a considerable concern.

Computer virus has the ability to copy itself and infect the system.

 The term virus is also commonly but erroneously used to refer to other types of malware, 

Adware and Spyware programs that do not have reproductive ability.

 A true virus can only spread from one system to another (in some form of executable 

code) when its host is taken to the target computer; for instance, when a user sent it over 

the Internet or a network, or carried it on a removable media such as CD, DVD or USB 

drives.

 Viruses can increase their chances of spreading to other systems by infecting files on a 

network file system or a file system that is accessed by another system.

Malware includes computer viruses, worms, Trojans, most Rootkits, Spyware, dishonest 

Adware, crimeware and other malicious and unwanted software as well as true viruses.

 Viruses are sometimes confused with computer worms and Trojan Horses, which are

technically different (see Table 4.7 to understand the difference between computer virus 

and worm).

 A worm spreads itself automatically to other computers through networks by exploiting

security vulnerabilities, whereas a Trojan is a code/program that appears to be harmless 

but hides malicious functions.

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