Computer Worms

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computer worm is a self-replicating malware computer program, which uses a computer network to send copies of itself to other nodes (computers on the network) and it may do so without any user intervention. This is due to security shortcomings on the target computer. Unlike a computer virus, it does not need to attach itself to an existing program. Worms almost always cause at least some harm to the network, even if only by consuming bandwidth, whereas viruses almost always corrupt or modify files on a targeted computer.

Here are ways to keep your systems and networks as safe as possible from worms:

Keep Your Computers Patched - Worms most often rely on unpatched computers to spread. They use vulnerable network services to infect and gain access to the computer's resources. Patches fix the vulnerabilities.

Host-based Firewalls - A software firewall on your computer should be able to block many if not all worms from accessing your computer, and from using your computer to search on the network and Internet if you do become infected.

Network Perimeter Firewalls - Your network firewall can block worms from ever reaching your computers. A tightly configured firewall can also block worms from making outbound connections to the Internet and trying to spread. This also keeps them from saturating your Internet connection and blocking traffic.

Filtering on Routers and Wi-Fi Equipment - In larger networks and commercial networks traffic can be filtered. Often access to the Internet can be configured to require authentication as well.

Anti-Virus Software - This is the last and most fundamental line of defense against any infection of your PC. Frequently and automatically updated AV software should be able to identify worms, block them, disable them if they do connect, and alert you. Remember this especially if your computer is a laptop and is on untrusted networks frequently.