The article presents threat analysis resulting from botnet activity on the Internet. Botnet networks are a very common tool among cybercriminals. They enable the acquisition of large amounts of data from computers infected with the virus that creates the given network entirely subordinated to its creator. Currently, many unidentified botnets are a threat to Internet users. Those identified and diagnosed answer the problem of how dangerous a botnet is in the hands of cybercriminals. The article presents statistics and analysis of selected botnets. Currently, there is a decline in the interest in botnets in cybercrime, although many new threats appear, suggesting that botnets will continue to be popular and are still a dangerous weapon in the hands of criminals.