A Russian national accused by U.S. authorities of participating in a vast cyberespionage campaign pleaded not guilty Thursday in a federal court in Boston. Prosecutors allege that Denis Obrezko was involved in hacking operations against Western organizations as part of a campaign linked to the Russian government.
Thirty-six-year-old Denis Obrezko appeared remotely before a federal judge after being charged earlier this week with conspiracy to commit computer fraud and misuse of computer systems. He was extradited from Thailand last month, following his arrest there in November.
According to the prosecution, Obrezko previously worked for the FSB, the Russian intelligence service, and allegedly participated in a cyber espionage operation targeting American and European companies, European government agencies close to NATO, and organizations supporting the Ukrainian resistance against the Russian invasion.
Court documents indicate that the FBI has identified at least eleven American companies that were allegedly victims of this hacking campaign. Prosecutors believe the defendant faces up to ten years in prison if convicted of the charges against him.
The indictment refers to hacking operations tracked by cybersecurity researchers under the names "Void Blizzard" and "Laundry Bear." These names correspond to those used by Microsoft and Dutch intelligence services in May 2025 to refer to a newly identified Russian cybercriminal group.
Denis Obrezko denies the accusations against him. The legal proceedings will now continue in the United States to determine his potential role in this alleged cyberespionage campaign and the responsibilities associated with the cyberattacks mentioned by investigators.
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