Replication does not require user intervention, although initial execution or a particular path may still depend on exploitation, stolen access, unsafe configuration, or user action.
A worm commonly discovers targets, transfers or exploits its way in, launches a copy, and repeats. Propagation can consume network, processor, memory, and service capacity even without a destructive payload. It may also install ransomware, spyware, a rootkit, or other components.
Key points
Propagation pathsWorms can exploit services, reuse credentials, copy through shared resources, or abuse messaging and management channels. Each path needs suitable containment and evidence.
ContainmentRestrict affected paths, protect essential services, segment proportionately, and remediate the propagation mechanism. Large-scale blocking must account for operational dependencies.
InvestigationEstablish the earliest affected systems, direction and timing of spread, exploited weakness or account, secondary payloads, and telemetry gaps.
Important limitationWidespread infection is not automatically a worm. A controller can deploy malware without self-replication, while a worm may remain constrained by topology, permissions, or incompatible targets.