Russia's military intelligence unit known as Sandworm has, for the past decade, served as the Kremlin's most aggressive cyberattack force, triggering blackouts in Ukraine and releasing self-spreading, destructive code in incidents that remain some of the most disruptive hacking events in history. In recent months, however, one group of hackers linked to Sandworm has attempted a kind of digital mayhem that, in some respects, goes beyond even its predecessor: They've claimed responsibility for directly targeting the digital systems of water utilities in the United States and Poland as well as a water mill in France, flipping switches and changing software settings in an apparent effort to sabotage those countries' critical infrastructure. Since the beginning of this year, a hacktivist group known as the Cyber Army of Russia, or sometimes Cyber Army of Russia Reborn, has taken credit on at least three occasions for hacking operations that targeted US and European water and...
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