Security Service of Ukraine (SBU) has stopped the spread of the virus, which attacked the Ukrainian segment of information systems on Tuesday, the SBU said.

"Specialists of the Security Service of Ukraine have established that the conveyance of the virus takes place using phishing emails with the return address, which is associated with Microsoft's technical support service. On October 24, the Kyiv subway and Odesa airport were subjected to a cyber attack. As a result of the virus of the cryptographic type, the functioning of the passenger registration service was blocked. The further spread of the virus has been discontinued. There are no threats to traffic safety," SBU said on its Facebook page on Tuesday evening.

At the same time, the SBU published recommendations for preventing unauthorized blocking of information systems.

The SBU reminded that on October 12 they warned about a possible large-scale cyber attack on state structures and private companies and provided relevant recommendations.