New Dohdoor Malware Attacking Schools and Health Care Sectors in U.S. via Multi-Stage Attack Chain

A newly discovered malware campaign has been quietly targeting educational institutions and healthcare organizations across the United States since at least December 2025. The threat, tracked under the actor designation “UAT-10027,” deploys a previously unknown backdoor called “Dohdoor,” which uses an advanced combination of stealth techniques and multi-stage delivery to gain persistent access into victim […]

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