Locked Freeze: payload toolkit for bypassing EDRs

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Freeze is a payload creation tool used for circumventing EDR security controls to execute shellcode in a stealthy manner. Freeze utilizes multiple techniques to not only remove Userland EDR hooks but to also execute shellcode in such a way that it circumvents other endpoint monitoring controls.

Creating A Suspended Process

When a process is created, Ntdll.dll is the first DLL that is loaded. This happens before any EDR DLLs are loaded. This means that there is a bit of a delay before an EDR can be loaded and start hooking and modifying the assembly of system DLLs. In looking at Windows syscalls in Ntdll.dll, we can see that nothing is hooked yet. If we create a process in a suspended state (one that is frozen in time), we can see that no other DLLs are loaded, except for Ntdll.dll. You can also see that no EDR DLLs are loaded, meaning that the syscalls located in Ntdll.dll are unmodified.

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