Unhookingntdll_disk.exe

Elias pulled the file into his sandbox. He watched as the malware performed a classic evasion maneuver:

: It then identified the .text section (the executable code) of the "dirty" ntdll.dll already running in its process memory and overwrote it with the "clean" code from the disk. The Result: Silent Execution UnhookingNtdll_disk.exe

Most modern EDR (Endpoint Detection and Response) tools work by placing "hooks" in ntdll.dll . This DLL is the lowest-level gateway to the Windows kernel. When a program wants to open a file or connect to the internet, it calls a function in ntdll.dll . The EDR’s hooks intercept that call, check if it’s malicious, and then let it pass—or kill it. Elias pulled the file into his sandbox

With the "clean" code back in place, the EDR’s hooks were gone. The security software was still running, but it was now effectively "blind" to what UnhookingNtdll_disk.exe did next. This DLL is the lowest-level gateway to the Windows kernel

: It read the clean, un-hooked code from the disk into a new section of memory.

By sunrise, the workstation was isolated, and the "unhooker" was neutralized before it could finish its work.