Rhysida (hacker group)

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Rhysida is a ransomware group that encrypts data on victims' computer systems and threatens to make it publicly available unless a ransom is paid. The group uses eponymous ransomware-as-a-service techniques, targets large organisations rather than making random attacks on individuals, and demands large sums of money to restore data. The group perpetrated the notable 2023 British Library cyberattack and Insomniac Games data dump. It has targeted many organisations, including some in the US healthcare sector, and the Chilean army. In November 2023, the US agencies Cybersecurity and Infrastructure Security Agency (CISA), FBI and MS-ISAC published an alert about the Rhysida ransomware and the actors behind it, with information about the techniques the ransomware uses to infiltrate targets and its mode of operation. The group takes its name from the genus of centipedes, and uses a centipede logo. Their location is unknown, but authorities believe the group to be based in Russia or multiple Russian-speaking countries, as comments found within their malware's code are written in Russian.