'I can fight with a keyboard': How one Ukrainian IT specialist exposed a notorious Russian ransomware gang

As Russian artillery began raining down on his homeland last month, one Ukrainian computer researcher decided to fight back the best way he knew how -- by sabotaging one of the most formidable ransomware gangs in Russia.

Four days into Russia's invasion, the researcher began publishing the biggest leak ever of files and data from Conti, a syndicate of Russian and Eastern Europe cybercriminals wanted by the FBI for conducting attacks on hundreds of US organizations and causing millions of dollars in losses.

The thousands of internal documents and communications include evidence that...