What computer virus did the Fred Cohan invented?

Fred Cohen is known for his pioneering work in computer security, particularly for demonstrating the concept of Computer Viruses in his 1984 paper. He created a theoretical virus called "Cohen's Virus" as part of his research, which showcased how self-replicating programs could spread and infect other systems. This work laid the foundation for the study of computer viruses and prompted further research into cybersecurity and virus detection methods.