A new cybersecurity advisory from the U.S. Cybersecurity & Infrastructure Security Agency (CISA) describes recently observed tactics, techniques, and procedures (TTPs) observed with North Korean ransomware operations against public health and other critical infrastructure sectors. The document is a joint report from the NSA, FBI, CISA, U.S. HHS, and the Republic of Korea National Intelligence Service and Defense Security Agency, and notes that the funds extorted this way went to support North Korean government’s national-level priorities and objectives. Apart from privately-developed lockers, CISA says that the hackers also used about a dozen other strains of file-encrypting malware to attack South Korean and U.S. healthcare systems.

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