Skip to main content

Computer virus and types of computer virus-computer world

 Computer virus

 A computer virus is a small program that can copy itself and infect the system without the permission of other user. How we recognize viruses virus if It meet to criteria

 It must execute itself

 It must application itself, it may replace other executable file with a copy of the virus infected file.

 viruses can increase their chance of spreading two other computers by affecting files on a network file system or a file system that is accessed by another computer, it can carried it on a removable medium such as a floppy disk, CD, DVD or USB drives. The term "computer virus" means is sometime used as a catch all phrase to include all type of Malware. File infected virus boot sector viruses,  Master boot record viruses, multi. participate. viruses and macro viruses. This classification depend upon their target area a mode of operation. 

virus can be divided into two types based on their behavior when They are executed. 

  1. Non resident viruses : Non resident viruses immediately search for other host that can be infected, infect those targets, and transfer control to the application program they infected.
  2. Resident viruses : Resident viruses to note search for host when they are started. Instead resident virus load itself into memory on execution and transfer control to the host program. The virus stay active in the background and infects new post when those files are accessed by other programs for the operating system itself.

Comments

Post a Comment

Popular posts from this blog

Single partition allocation, Multiple-partition allocation and Fixed Equal-size partitions in operating system-computer world

  Single partition allocation, Multiple-partition allocation and Fixed Equal-size partitions in operating system Single partition allocation In this scheme operating system is residing in law memory and user process are executing in higher memory. Advantages It is simple  It is easy to understand and use Disadvantages User job is limited to the size of available memory. It leads to poor Utilization of processor and memory. Multiple-partition allocation  It is the simplest method for allocating  memory is divided memory into several fixed size partitions. Fixed Equal-size partitions It divides the main memory Into equal number of fixed sized partitions, operating system occupies some fixed portion and remaining portion of main memory is available for user processes. Advantages It supports multi programming. A process whose size is less then or equal to the partitions size can be loaded into any available partition. Disadvantages If a program is big to fit in...
Post a Comment
Read more

Deadlock in operating system-computer world

  Deadlock in operating system-computer world Deadlock :  In a multi-programming environment, many process may complete for a minute number of resources. A process make a request for a resource and if the resource is not available at that time, the process enter In a waiting state. A waiting state process is never again-able to change state because the resource it has requested is held by other waiting process. This situation is called deadlock. So we can say that a process is said to be deadlock when it is waiting for an event or resources which will never occurs.   so we can say that in this situation none of the process gets executed  since the resource it needs, is held by some other process which is also waits for some other resource to be released.  Let's assume that there are three process P1, P2, p3 and three different resources R1, R2 and R3. R1 is assigned to p1, R2 is assigned to P2 and R3 is assigned to P3.   After somet...
9 comments
Read more

What is computer and its characteristics-computer world

  What is computer and its characteristics  Computer  :  Computer is an electronic data processing device, which accept and store data input, process the data and generates the output in a required format. computer is made up of integrated  parts (input, control, ALU, storage and output unit) All the part work together to process data so, we can say that a computer is a programmable electronic device accept row data as input and process it with  set of instruction to produce the result as output. Meaning of computer The word "computer" comes from the word "compute" which means to "calculate". The word computer is derived from the Latin word compute which means to calculate. Characteristics of computer Automatic : It is a automatic machine work by itself without human instruction. Speed :  A computer is a very fast devices. It can perform in a few second, the amount of work that a human being can do in an entire year.  Accuracy : In addition t...
1 comment
Read more