Hackers from the Blackjack group, probably related to the SBU, hacked the servers of the Russian state-owned enterprise Main Military Construction Directorate for Special Facilities, which is building military facilities throughout the territory of the Russian Federation, an informed source told Interfax-Ukraine on Thursday.

According to the agency interlocutor, hackers downloaded more than 500 passports of military facilities of the Ministry of Defense of the Russian Federation: arsenals of weapons, sites of anti-aircraft missile systems, headquarters, barracks, including those located in the occupied territories of Ukraine, as well as other technical and design documentation.

Hackers also demolished seven servers and encrypted more than 150 computers of the institution's employees, as a result of which most Russian special builders were left without the entire array of data and backup copies of information.