Which type of malicious code can autonomously replicate and propagate across networks without attaching itself to an existing program or requiring user action?
Virus
Ransomware
Worm
Trojan horse
A worm is a self-contained piece of malware that can copy itself from one system to another without any need to piggy-back on another file or wait for a user to run it. This autonomous replication distinguishes worms from viruses, which must infect host files to spread. Trojans, in contrast, masquerade as legitimate software and rely on users to install or run them; they do not self-replicate. Ransomware is malware that encrypts or blocks access to data until a ransom is paid, but it also lacks the automatic self-propagating property that defines a worm. Therefore, the worm is the only option that fulfills the description of independent, self-replicating network propagation.
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