Key Findings Symantec and VMware Carbon Black researchers have uncovered a new ransomware strain called Osiris, used in a November 2025 attack against a major Southeast Asian food service franchise operator. Osiris leverages the POORTRY driver in a bring-your-own-vulnerable-driver (BYOVD) attack to disable security software on targeted systems. The new ransomware has full-featured capabilities, including the ability to stop services and processes, select files and folders to
