Computer viruses and worms are both types of malicious software (malware) that can infect and spread across computer systems and cause havoc to your network security, but they have distinct characteristics and behaviours. Here is an overview of each and the differences between them.

Computer Virus

A computer virus is a type of malware that attaches itself to legitimate program files or documents on your Lenovo, HP or Dell laptop in Sri Lanka or other computer. It spreads by infecting these files, and when the infected file is executed, the virus code also gets executed, allowing the virus to replicate and spread to other files and systems. Viruses often require human action to propagate, such as opening an infected email attachment or downloading an infected file from the internet.

Key characteristics of computer viruses:

●       Requires a host file to attach to.

●       Spreads through the sharing of infected files.

●       Often relies on human action to trigger its spread.

●       May be dormant until the infected program or file is executed.

Computer Worm

A computer worm is a standalone malware program that can spread across networks and systems without the need for a host file. Worms exploit vulnerabilities in operating systems or applications to self-replicate and propagate from one system to another. They can spread rapidly, affecting a large number of systems in a short amount of time. Unlike viruses, worms can spread autonomously without requiring user intervention.

Key characteristics of computer worms:

●       Is a self-contained program that doesn't need a host file.

●       Spreads over networks by exploiting vulnerabilities.

●       Can spread without requiring user interaction.

●       Can replicate and spread rapidly across a large number of systems.

Differences between computer viruses and worms

●       Host Dependency: Viruses require a host file to attach to, while worms are standalone programs that can move and replicate independently.

●       Propagation Mechanism: Viruses typically spread through the sharing of infected files, often requiring user actions to trigger their spread. Worms spread by exploiting network vulnerabilities, allowing them to propagate autonomously without user intervention.

●       Need for Execution: Viruses need their host files to be executed in order to infect and spread. Worms can spread without needing their host program to be executed.

●       Autonomy: Worms can move and replicate on their own, while viruses are reliant on a host program's execution.

●       Speed of Spread: Worms can spread more quickly than viruses since they can exploit network vulnerabilities and infect remote systems directly.

●       Payload: Both viruses and worms can carry malicious payloads, such as data destruction, theft, or other types of cyberattacks.

While both computer viruses and worms are forms of malware designed to infect and compromise computer systems, their methods of propagation, behaviour, and independence differ. Viruses attach themselves to host files and rely on user actions, while worms are self-contained programs that exploit network vulnerabilities to spread autonomously. It is very important to have proper antivirus software on your computers offered by reputed firewall providers in Sri Lanka, in order to mitigate the risks of such cyber-attacks.