LCRYX Ransomware MBR Overwrite via PowerShell PhysicalDrive Write

Ibrahim Saud@tektrix

•updated Jun 25, 2026•0•0•1

Detects LCRYX ransomware activity where PowerShell is used to write data from a specified file (gcrybground.png) directly to the physical disk (PhysicalDrive), intending to overwrite the Master Boot Record (MBR) and render the system unbootable. It also monitors for subsequent attempts to disable Windows system recovery via bcdedit.