VIRUSES

VIRUSES and RELATED THREATS

virus: a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer ...

A program which 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

PHASES OF VIRUS

l) Dormant Phase (idle phase)
II) Propagation Phase (the virus places an identical copy of itself into other program or system area on disk)
lII) Triggering Phase (The Virus Activated to perform the function)
lV) Execution Phase (The function is perform)

TYPES OF VIRUS

l) Parasitic Virus (tradisional and still most common form)
li) Memory-resident Virus (lodges in main memory)
lii) Boot Sector Virus (Infect a master boot record (MBR) and spreads when a system is booted)
lv) Stealth Virus (a Form a Virus explicite design to hide itself from detection by antivirus software)
V) Polymorphics (A mutates with every infection, making detection by signature of the virus imposible

HOME OF VIRUSES

l) Parasitic Virus (tradisional and still most common form)
li) Memory-resident Virus (lodges in main memory)
lii) Boot Sector Virus (Infect a master boot record (MBR) and spreads when a system is booted) lii) Stealth Virus (a Form a Virus explicite design to hide itself from detection by antivirus software)
lv) Polymorphics (A mutates with every infection, making detection by signature of the virus imposible

MACRO VIRUS

l) A Macro virus is platform independent
li) Infect document, not executable portion of code
lii) Easy spread most by electronic mail