Operations_and_functions Computer_virus

1 operations , functions

1.1 parts

1.1.1 infection mechanism
1.1.2 trigger
1.1.3 payload


1.2 phases

1.2.1 dormant phase
1.2.2 propagation phase
1.2.3 triggering phase
1.2.4 execution phase

operations , functions
parts

a viable computer virus must contain search routine, locates new files or new disks worthwhile targets infection. secondly, every computer virus must contain routine copy program search routine locates. 3 main virus parts are:

infection mechanism

infection mechanism (also called infection vector ), how virus spreads or propagates. virus typically has search routine, locates new files or new disks infection.

trigger

the trigger, known logic bomb, compiled version activated time executable file virus run determines event or condition malicious payload activated or delivered such particular date, particular time, particular presence of program, capacity of disk exceeding limit, or double-click opens particular file.

payload

the payload actual body or data perform actual malicious purpose of virus. payload activity might noticeable (e.g., because causes system slow down or freeze ), of time payload harmful activity, or times non-destructive distributive, called virus hoax.

phases

virus phases life cycle of computer virus, described using analogy biology. life cycle can divided 4 phases:

dormant phase

the virus program idle during stage. virus program has managed access target user s computer or software, during stage, virus not take action. virus activated trigger states event execute virus, such date, presence of program or file, capacity of disk exceeding limit or user taking action (e.g., double-clicking on icon, opening e-mail, etc.). not viruses have stage.

propagation phase

the virus starts propagating, multiplying , replicating itself. virus places copy of other programs or system areas on disk. copy may not identical propagating version; viruses morph or change evade detection professionals , anti-virus software. each infected program contain clone of virus, enter propagation phase.

triggering phase

a dormant virus moves phase when activated, , perform function intended. triggering phase can caused variety of system events, including count of number of times copy of virus has made copies of itself.

execution phase

this actual work of virus, payload released. can destructive such deleting files on disk, crashing system, or corrupting files or relatively harmless such popping humorous or political messages on screen.