Government spokesman Janusz Cieszynski, speaking on Polish public radio, said authorities had not yet identified the source of the attacks. We guess the fact that the attack happened as Russia presses a full-scale invasion of Ukraine, Poland's eastern neighbor is just a co-incidence.

The chief executive of Poland's top power utility PGE SA, Wojciech Dabrowski, told the broadcaster that his company's IT networks had been attacked, but added that they remained safe and that supply of heat and power had not been interrupted.

Poland increased its cyber security alert level obliging operators of critical infrastructure to closely monitor their systems which is the regulatory equivalent of your mother telling you to “be careful” before you go out cycling with your mates.
Western governments and many companies are on heightened alert for cyberattacks after the announcement of sweeping economic sanctions on Russia, whose forces on Friday were pounding Ukrainian cities including the capital Kyiv.

Ukraine has suffered a series of cyberattacks in recent weeks that Kyiv has blamed on Russia. Moscow has repeatedly denied any involvement in the attacks, but then they did also say that they were only on training exercises across the border.