techlife4u.com

COMPUTER VIRUS

What is a Virus / Computer Virus ?

A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user.

What exactly a virus can do ?

The original virus may modify the copies, or the copies of infected files may modify themselves.

How does a virus spread ?

A virus can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or the Internet, or by carrying it on a removable medium such as a floppy disk, CD , or USB Drive. Meanwhile viruses can spread to other computers by infecting files on a network file system or a file system that is accessed by another computer.

When was the first such “Virus / Program” detected or created? By Whom ?

The Creeper virus was first detected on ARPANET, the forerunner of the Internet in the early 1970s. It spread via the TENEX operating system and could make use of any connected modem to dial out to remote computers and infect them. It would display the message “I’M THE CREEPER : CATCH ME IF YOU CAN.”.

The first major PC virus was a boot sector virus called Brain. It was created by Farooq Alvi Brother from Lahore Pakistan, in the year 1986. Actually the brothers created a program to stop creating copies of software which they wrote. However it was later named as a virus since it was infecting the boot sector of a machine and was causing damage to it.

Brain affected the computer by replacing the boot sector of a floppy disk with a copy of the virus. The real boot sector is moved to another sector and marked as bad. Infected disks usually have three kibibytes of bad sectors. The disk label is changed to Brain, and the following text can be seen in infected boot sectors:

Welcome to the Dungeon (c) 1986 Brain & Amjads (pvt) Ltd VIRUS_SHOE RECORD V9.0 Dedicated to the dynamic memories of millions of viruses who are no longer with us today – Thanks GOODNESS!! BEWARE OF THE er..VIRUS : this program is catching program follows after these messages….$#@%$@!!

Welcome to the Dungeon (c) 1986 Basit * Amjad (pvt) Ltd. BRAIN COMPUTER SERVICES 730 NIZAM BLOCK ALLAMA IQBAL TOWN LAHORE-PAKISTAN PHONE: 430791,443248,280530. Beware of this VIRUS…. Contact us for vaccination…

How does a virus affect my system ?

In order to work, a virus must be permitted to execute code and write to memory. This is the reason, many viruses attach themselves to executable files that may be part of legal programs. When user tries to run the infected program, the virus’ code may be executed first and then the original program starts.

What are the types of virus ?

Depending on the behavior and functionality the virus are divided in two categories

A) Resident Viruses

B) Non Resident Viruses

A) Resident Viruses

A type of computer virus that stores itself within memory allowing it to infect files instantaneously and does not require the user to run the file to infect files..

B) Non Resident Viruses :

A type of computer virus that does not store or execute itself from the computer memory. Executable viruses are an example of a non resident virus.

I wish all the Indians all over the world a very happy independence Day… Long live India .. long live the Indian Freedom !

‘The Indian flag is a horizontal tricolor in equal proportion of deep saffron on the top, white in the middle and dark green at the bottom. The ratio of the width to the length of the flag is two is to three. In the centre of the white band, there is a wheel in navy blue to indicate the Dharma Chakra, the wheel of law in the Sarnath Lion Capital. This center symbol or the ‘CHAKRA’ is a symbol dating back to 2nd century BC. Its diameter approximates the width of the white band and it has 24 spokes, which intends to show that there is life in movement and death in stagnation. The saffron stands for courage and sacrifice; the white, for purity and truth; the green for growth and auspiciousness.

The Constituent Assembly which drew up the Constitution of India, adopted, on 22 July 1947, the tricolor as Independent India’s National Flag. After a debate, the Dharma Chakra (of Emperor Ashoka) was included in the central white stripe of the flag, instead of the Charka (used symbolically by Gandhiji and also included in the flag used by the Indian National Congress). The same Chakra adorns the State Emblem adapted from the Sarnath Lion Capital of Ashoka in addition to the motto from the Mundaka Upanishad, Satyameva Jayate which means: Truth alone triumphs. The Chakra or the wheel symbolizes the Power of the State governed by Dharma, which is the primordial Indian system of justice which is the bed-rock, not only of governance but of the socio-politico-economic edifice itself.’ Brinda Maindiratta, 2 April 2003
The following is an extract from the preamble to the flag code of India as posted on the official Home Ministry website of the Indian government:

The significance of the colours and the chakra in the National Flag was amply described by Dr. S. Radhakrishnan in the Constituent Assembly which unanimously adopted the National Flag. Dr. S. Radhakrishnan explained -

1. “Bhagwa or the saffron colour denotes renunciation of disinterestedness. Our leaders must be indifferent to material gains and dedicate themselves to their work.
2. The white in the centre is light, the path of truth to guide our conduct.
3. The green shows our relation to soil, our relation to the plant life here on which all other life depends.
4. The Ashoka Wheel in the centre of the white is the wheel of the law of dharma. Truth or satya, dharma or virtue ought to be the controlling principles of those who work under this flag. Again, the wheel denotes motion. There is death in stagnation. There is life in movement. India should no more resist change, it must move and go forward. The wheel represents the dynamism of a peaceful change.”