Which virus spreads by itself?
Worm virus spreads by itself.
A computer worm is a standalone malware computer program that replicates itself in order to spread to other computers. Often, it uses a computer network to spread itself, relying on security failures on the target computer to access it.
Worms can be transmitted via software vulnerabilities. Or computer worms could arrive as attachments in spam emails or instant messages. Once opened, these files could provide a link to a malicious website or automatically download the computer worm.