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Logic of Computer Virus

MODULE  virus; {Inserts itself in another program}

var stage:=dormant

Procedure s_dormant;

  begin

  evaluate dormant_waiting condition ;

  if done_waiting then stage:=propagate

end; {s_dormant}

Procedure s_propagate;

begin

  find unifected program;

  copy this to program with stage set to dormant;

   if propagate_done then stage:=trigger

end; {s_propagate}

Procedure s_trigger

begin

   evaluvate trigger condition;

   if trigger=on thendtage:= damage

end; {s_trigger}

Procedure s_damage

  do damage 

end; {s_damage}

begin: {control initially transfer here}

  if stage=format thens_dormant

  else if stage=propagate then s_propagate

  else if stage=trigger then s_trigger

   else s_damage

   got beginning of host program

Against Virus:

                        Computer virus is a self-replicate program to destroy your computer. Using of good antivirus is the only solution against virus. It is very difficult to identify the virus, but by using a good antiviruses like Kasper sky, Norton etc,  will automatically identify the virus and make your system free of the menace. Happy browsing.

Sarathlal