Learn More About Viruses

Boot Sector Virus
• Attaches itself to the boot sector of a floppy disk or an executable file
• Copies all or part of itself onto the boot sector of your hard drive when you turn on your computer or try to run an executable file
• Can get one from an infected disk or the Internet

File-Infecting Virus
• Attach themselves to executable files associated with other programs
• Mostly attach to .EXE or .COM files but can infect .SYS, .DLL, and .BIN files
• When you open a program that contains a virus, the virus loads into your computer’s memory and then infects any other executed program.

Macro Virus
• Affect the Microsoft Word and Excel templates
• Once infected, every document or spreadsheet opened with the program becomes corrupted.
• Widespread

Polymorphic Virus
• Can infect the boot sector, files, or both
• Can modify their appearance and signature
• Use code alteration and encryption so that they can not be detected by anti-virus search screens

Stealth Viruses
• Infects a file by adding bytes to the infected file, and then subtracting the same number of bytes to from the directory entry of that file, so that it appears that nothing is different
• Stay in memory

Multipartite Virus
• Can infect the boot sector and executable files
• Combine characteristics of memory-resident and nonresident files, and boot sector viruses incorporating stealth and polymorphic characteristics.

Meta Virus
• The first viruses known to infect data files and work on multiple platforms
• Normally carried in data files for Microsoft Word and AmiPro documents
Other Destructive Programs

Worms
• Often mistaken for a virus
• A single destructive program on a single system
• Often planted by someone with direct access to the system
• Do not replicate themselves

Trojan Horses
• Appears to be a program
• Waits for an user to execute it
• Can infect other files on the system, or other computers on the network

Logic Bombs
• Similar to a Trojan Horse but it has a timing device that is keyed to go off on a certain day or time
• Can do damage anywhere from destroying data on the hard drive to releasing a virus

Computer Viruses

Dear, Sir/Madam

Do you familiar with "Computer Viruses" if not please read below:

A virus is a software program designed to infect, destroy or interfere with a computer or software program. A Virus is a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer. This computer program can copy itself and infect a computer without the permission or knowledge of the owner. It can be transmitted between computers via networks (especially the Internet) or removable storage such as CDs, USB drives, floppy disks, etc., generally without the knowledge or consent of the recipient. It's a very dangerous computer program with the characteristic feature of being able to generate copies of it (self), and thereby spreading. Additionally most computer viruses have a destructive payload that is activated under certain conditions. A computer virus is a piece of code that is secretly introduced into a system in order to corrupt it or destroy data. Often viruses are hidden in other programs or documents and when opened, the virus is let loose. This is a self-replicating computer program that spreads by inserting copies of itself into other executable code or documents.

A virus can infect other programs by modifying them to include a possibly evolved copy of itself. Programming code created as a prank or as a malicious action that secretly affects other programs and causes unwanted consequences. It can damage system's settings and memory, so it is possible for virus to generate run time error messages as well.

If your computer is already running a virus protection program make sure it has latest updated patch or ".dat" file.


According to my experience a truth is that a true virus cannot spread to another computer without human assistance. So you have to be careful yourself while working at computer/Laptops.

If you are suffering from computer viruses please feel easy to contact me.