CRPx0 ntdll.dll Unhooking to Evade EDR Userland Monitoring

Ibrahim Saud@tektrix

•updated 22 days ago•0•0•2

Detects the CRPx0 ransomware technique of unhooking ntdll.dll in memory. This is achieved by reading the ntdll.dll file from disk and overwriting the in-memory .text section with a clean, unhooked version to bypass EDR monitoring and execute direct syscalls.