Initial programs like Creeper (1971) were experimental and self-replicating. The first PC virus, Brain (1986) , targeted boot sectors, and the Morris Worm (1988) became the first major Internet-wide incident.
Contemporary threats use AI-driven techniques to evade detection. Fileless malware operates in a system's memory to avoid leaving traces on disks, while state-sponsored attacks target critical infrastructure for espionage. Modern Defensive Strategies Malware Evolution
The rise of the web led to mass-mailing worms and the proliferation of Trojans —malicious software disguised as legitimate applications. This era also saw the emergence of Adware and Spyware . Initial programs like Creeper (1971) were experimental and