New Osiris Ransomware Emerges as New Strain Using POORTRY Driver in BYOVD Attack

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Cybersecurity researchers have disclosed details of a new ransomware family called Osiris that targeted a major food service franchisee operator in Southeast Asia in November 2025.
The attack leveraged a malicious driver called POORTRY as part of a known technique referred to as bring your own vulnerable driver (BYOVD) to disarm security software, the Symantec and Carbon Black Threat Hunter

Source : https://thehackernews.com/2026/01/new-osiris-ransomware-emerges-as-new.html