Update README.md

merge-requests/1/head
_xeroxz 4 years ago
parent 5baa613bba
commit 1162a330b7

@ -14,26 +14,40 @@ but is removed after every syscall into NtShutdownSystem to prevent possible det
In this example VDM syscalls into an inline hook placed on NtShutdownSystem to call memcpy exported from ntoskrnl.exe.
#### Demo Code
```cpp
vdm::vdm_ctx vdm;
const auto ntoskrnl_base =
reinterpret_cast<void*>(
util::get_module_base("ntoskrnl.exe"));
const auto ntoskrnl_memcpy =
util::get_kernel_export("ntoskrnl.exe", "memcpy");
std::printf("[+] drv_handle -> 0x%x, drv_key -> %s\n", drv_handle, drv_key.c_str());
std::printf("[+] %s physical address -> 0x%p\n", vdm::syscall_hook.first, vdm::syscall_address.load());
std::printf("[+] ntoskrnl base address -> 0x%p\n", ntoskrnl_base);
std::printf("[+] ntoskrnl memcpy address -> 0x%p\n", ntoskrnl_memcpy);
short mz_bytes = 0;
vdm.syscall<decltype(&memcpy)>(ntoskrnl_memcpy, &mz_bytes, ntoskrnl_base, sizeof mz_bytes);
std::printf("[+] kernel MZ -> 0x%x\n", mz_bytes);
vdm::vdm_ctx vdm;
const auto ntoskrnl_base =
reinterpret_cast<void*>(
util::get_module_base("ntoskrnl.exe"));
const auto ntoskrnl_memcpy =
util::get_kernel_export("ntoskrnl.exe", "memcpy");
std::printf("[+] drv_handle -> 0x%x, drv_key -> %s\n", drv_handle, drv_key.c_str());
std::printf("[+] %s physical address -> 0x%p\n", vdm::syscall_hook.first, vdm::syscall_address.load());
std::printf("[+] ntoskrnl base address -> 0x%p\n", ntoskrnl_base);
std::printf("[+] ntoskrnl memcpy address -> 0x%p\n", ntoskrnl_memcpy);
short mz_bytes = 0;
vdm.syscall<decltype(&memcpy)>(
ntoskrnl_memcpy,
&mz_bytes,
ntoskrnl_base,
sizeof mz_bytes
);
std::printf("[+] kernel MZ -> 0x%x\n", mz_bytes);
```
#### Demo Code Result
```
[+] drv_handle -> 0x70, drv_key -> frAQBc8Wsa1xVPfv
[+] NtShutdownSystem physical address -> 0x00000000109BB3A0
[+] ntoskrnl base address -> 0xFFFFF80075200000
[+] ntoskrnl memcpy address -> 0xFFFFF800755F0980
[+] kernel MZ -> 0x5a4d
[+] press any key to close...
```
# Usage

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