Ukrainian hacker admits affiliate role in Nefilim ransomware gang

A Ukrainian national, Artem Aleksandrovych Stryzhak, pleaded guilty to involvement in Nefilim ransomware attacks that targeted large corporations across the United States and multiple other countries; the operation used customized ransomware and threatened stolen data via a "Corporate Leaks" site to extort victims. Stryzhak was arrested in Spain, extradited to the U.S., faces up to 10 years in prison with sentencing scheduled for May 6, 2026, and U.S. authorities are offering rewards for information on an alleged administrator and co-conspirator, Volodymyr Tymoshchuk.