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; SDT Loader stub example (conceptual) mov rax, [rsp+8] ; retrieve syscall number cmp eax, CUSTOM_SYSCALL_NUMBER jne original_handler jmp my_payload_function original_handler: jmp [original_ssdt_entry] But modern variants don't even need a compare. Instead, they and route it to a dispatcher that parses a hidden command protocol. Why Not Hook the SSDT? Good question. Hooking is noisy. PatchGuard (Kernel Patch Protection) on x64 systems will happily bugcheck the system if it detects a modified SSDT entry. So how does an SDT loader survive?
Because in the end, the kernel trusts the table. And the table trusts the pointer. And the pointer… can be anyone. Want to experiment? Check out SyscallTables on GitHub and the NtUndocumented header – but only in a VM, and only after disabling PatchGuard. You have been warned.
Enter the : a technique that repurposes the kernel’s own system call dispatch mechanism to execute arbitrary payloads with minimal traces. The SSDT Refresher The SSDT (often called KiServiceTable in x86 NT内核) is the heart of user-to-kernel transition. When NtReadFile is called from user mode, syscall (or int 2e on legacy) lands in KiSystemServiceRepeat , which indexes into the SSDT to find the target kernel function.
; SDT Loader stub example (conceptual) mov rax, [rsp+8] ; retrieve syscall number cmp eax, CUSTOM_SYSCALL_NUMBER jne original_handler jmp my_payload_function original_handler: jmp [original_ssdt_entry] But modern variants don't even need a compare. Instead, they and route it to a dispatcher that parses a hidden command protocol. Why Not Hook the SSDT? Good question. Hooking is noisy. PatchGuard (Kernel Patch Protection) on x64 systems will happily bugcheck the system if it detects a modified SSDT entry. So how does an SDT loader survive?
Because in the end, the kernel trusts the table. And the table trusts the pointer. And the pointer… can be anyone. Want to experiment? Check out SyscallTables on GitHub and the NtUndocumented header – but only in a VM, and only after disabling PatchGuard. You have been warned. sdt loader
Enter the : a technique that repurposes the kernel’s own system call dispatch mechanism to execute arbitrary payloads with minimal traces. The SSDT Refresher The SSDT (often called KiServiceTable in x86 NT内核) is the heart of user-to-kernel transition. When NtReadFile is called from user mode, syscall (or int 2e on legacy) lands in KiSystemServiceRepeat , which indexes into the SSDT to find the target kernel function. ; SDT Loader stub example (conceptual) mov rax,
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