The police have arrested a citizen of Dnipropetrovsk region over suspicion of spreading Petya.A malware. Press service of the Cyber Police Department has said this in a statement, Ukrainian News Agency reports. According to the report, employees of the Department on Countering Cyber Threats in Chernihiv region (Kyiv Cyber Police Department of the National Police Cyber-Department) revealed that a 51-years old citizen of Nikopol (Dnipropetrovsk region) made publicly available through files exchange public services and other Internet social channels a video with detailed description of how to activate the Petya.A malware in computers. In the comments to the video the man also posted a link to his page in social media, to which he uploaded the harmful malware and spread it among Internet users. In addition, cyber police officers established a list of companies that decided to use the state-level cyber attack in their own advantage and intentionally downloaded the malware to their own computers in order to conceal their own fraudulent activity and avoid penalty payment to the government. Measures have been already taken to bring guilty to criminal responsibility. As Ukrainian News Agency earlier reported, the National Police opened 66 criminal investigations over cyber threats on corporate computer networks and state computer networks. On June 27, a number of Ukrainian banks were subjected to cyber attacks by harmful malware Petya.A.