Malware diversified into File Infectors that attached to executables and Macro Viruses that targeted productivity software like Microsoft Word.
To counter this rapid evolution, cybersecurity researchers use several advanced techniques: Malware Evolution
A Study Of Evolution of Malware and Its Orgins - ResearchGate Malware diversified into File Infectors that attached to
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. targeted boot sectors
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 .