Information has always been an important factor in human activity. As a resource that has guided human activity, information has been collected, stored, analyzed, and distributed in various ways throughout history, but it has also been stolen and misused. With the development of the Internet, cybercrime is developing in parallel, which violates the security of information systems. Information systems can be divided according to organizational structure, level of support, business function they maintain and according to the system architecture. One of the most famous information systems is the MS Office suite. Organizations are increasingly relying on information systems (IS) to improve business and operations, making it easier for management to make decisions and implement business strategies. The special need and dependence on IS has increased in the current business environments where various transactions, trade in goods and services are done exclusively electronically. Increased organizational dependence on IS has led to a corresponding increase in the impact of IS security abuse. The division of the entire protection of networked systems, according to the levels, is as follows: hardware-software protection and security, physical and organizational protection and security, legislative protection and security, and communication protection (crypto-protection) and information security. The most notorious Cyber-attack is WannaCry and the user of the infected computer had to pay a certain amount of money if he wanted to regain access to his own computer.