Computer Worms are much like viruses in that they are designed to imitiate themselves, but may not have a destructive effect. Unlike virus, however, worms are designed to imitiate and propagate without a carrier and because of this they are normally limited to infection through networks, eating on the bandwidth and producing congestion. A very common element carried by worms installs a trapdoor in the infected computer to allow the worm propagator get an unidentified access.
Worms are different from viruses. Viruses are dependent upon file transfers between machines to spread, while worms can run completely independently and spread through network connections.
Some of the visible symptoms of worms infection are:
- Computers are getting slow.
- Unexpected or frequently systems failures
There are several different types of worms, such as:
Email worms:
This type of worms spread via infected email messages and attachments.
Instant messaging worms:
These worms spread when user are involved in online messaging.
Internet worms:
These worms scan all available network resources using local operating system.once a vulnerable machine is spotted they will connect to the machine and gain full access.
Chat worms:
These worms spread through chat channels.
Morris and Mydoom worms:
These worms can cause major disruption by increasing network traffic and create a backdoor that can be used by other malwares for attacking the infected computer system.
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| Worm virus |
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