How Computer Viruses Work
A computer virus is a program that reproduces by attaching itself to another program or document. Similar to a biological virus, the virus has a code which is executed when the infected program is run.
This is the general way most viruses work:
Here are some useful anti-virus software resources:
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This is the general way most viruses work:
- When an infected program or file is opened, the computer virus attached to it is automatically activated.
- The virus modifies a computer program’s code so when a user starts the program, the virus code runs instead of the normal code.
- The moment the virus code becomes activated, the computer will then be under its full control.
- The virus aims to replicate and spread. Thus, it naturally looks for prospective targets to infect.
- Polymorphing: There are types of virus which can change its appearance and size. Many simple virus scanners then can hardly detect an infected file since it only monitors and searches a computer virus based on predefined patterns.
- Stealth: This kind of virus actively hides the changes it has made to the hard disk so it looks as if it has not infected the system. For example, a file infector may stay memory-resident and wrongly report the size of infected files so they don’t appear infected. Boot sector viruses can trap attempts to read the boot sector and return forged data.
- Disassembly Protection: There are many programming tricks that can be used to design viruses in such a way that it cannot be detected and combated.
Here are some useful anti-virus software resources:
- Norton Internet Security
- ZoneAlarm Extreme Security
- F-Secure Internet Security Suite
- Kaspersky Internet Security 2010
- Trend Micro Internet Security Suite
- AVG Internet Security 9.0
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