File infector virus

• It will begins to operate actively while the file is executed.
• When these kind of virus is activated,it will produces the damaging effect it is programmed to carry out
• These virus may completely overwrite the file that it infects or might be replace parts of the file

Resident viruses

• Virus known as permanently which dwells in the RAM of memory.
• virus that hides and stores itself within the computer memory, then allows it to infect any file that is run by the computer
• Corrupting programs and files that are closed,opened, renamed or copied.

MACRO VIRUS

• A virus called mellisa, embedded in a WORD document attach to an e-mail.
• Designed to infect different type of documents such as words, excel, power point presentation
• Use a program's own macro programming language to distribute the virus.
• May delete these files or convert them into unreadable form