The systems of protecting computers and networks are becoming more perfect every day. It’s harder for hackers to find a way to access data on someone else’s computer. A man remains the weakest link in cyber security. Not without reason 95 attacks on computer systems and networks begin with phishing ones. An example of such an attack observed in the last few months is mass mailings of infected Office documents. Thus, hackers try to intercept control on Windows and MacOS computers.