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Computer virus

A computer virus is a software program, which can reproduce itself or can self-replicate or can copy itself into another executable code or can copy itself into a document file causing great harm by corrupting a data file or by destroying data in the computer hard drive or by performing some harmful tasks in different forms. There are many types of computer virus and each performs in different ways. Some computer virus can secretly affect other programs causing unwanted or wrong results.
A computer virus, which is a small software program, may get transmitted from a computer to another computer through LAN or WAN or Internet or may get carried through removable storage such as floppy disks, CDs, data tapes, USB drives, etc. In most cases the transfer happens without the knowledge of the recipient, and thus remains undetected till the damage becomes visible. There are computer viruses, which remain hidden in other programs or documents, and once the document is accessed or opened, the virus spreads fast and creates an unmanageable situation, sometimes causing total stoppage of the operation.
The biggest risk of a computer virus is fact that in most cases we come to know about the presence of a computer virus only after the consequences created by the virus become visible.
Click here to read more about computer virus from Wikipedia.
Preventing virus attack:
To prevent virus attacks, it is very important to develop and include an effective virus protection policy in IT Security plan. Without a proper virus protection policy an IT infrastructure becomes vulnerable to virus attacks, which may cause disaster. It may be useful to hire professional people to work on and develop the virus protection policy, which will meet all the operational requirements.
The following are some of the recommended steps to prevent virus attacks:

  1. Purchase and introduce anti-virus software.
  2. Stop accessing attachments sent by unknown sender. Do not open attachments received from a known sender before checking virus.
  3. Introduce regular checking of all drives of computers and network drives.
  4. Check removable storage media before using, if possible restrict use removable storage media through only 1-2 gateway computers where virus-scan of the media is mandatory before use.
  5. Update the anti-virus software regularly, as often as possible.
  6. Use only licensed software and original media.
  7. Keep the computer OS updated with all released OS patches.