ZwSetInformationThread¶

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关于ZwSetInformationThread¶

ZwSetInformationThread 等同于 NtSetInformationThread，通过为线程设置 ThreadHideFromDebugger，可以禁止线程产生调试事件，代码如下

#include <Windows.h>
#include <stdio.h>

typedef DWORD(WINAPI* ZW_SET_INFORMATION_THREAD) (HANDLE, DWORD, PVOID, ULONG);
#define ThreadHideFromDebugger 0x11
VOID DisableDebugEvent(VOID)
{
    HINSTANCE hModule;
    ZW_SET_INFORMATION_THREAD ZwSetInformationThread;
    hModule = GetModuleHandleA("Ntdll");
    ZwSetInformationThread = (ZW_SET_INFORMATION_THREAD)GetProcAddress(hModule, "ZwSetInformationThread");
    ZwSetInformationThread(GetCurrentThread(), ThreadHideFromDebugger, 0, 0);
}

int main()
{
    printf("Begin\n");
    DisableDebugEvent();
    printf("End\n");
    return 0;
}

关键代码为ZwSetInformationThread(GetCurrentThread(), ThreadHideFromDebugger, 0, 0);，如果处于调试状态，执行完该行代码，程序就会退出

如何绕过¶

注意到该处 ZwSetInformationThread 函数的第 2 个参数为 ThreadHideFromDebugger，其值为 0x11。调试执行到该函数时，若发现第 2 个参数值为 0x11，跳过或者将 0x11 修改为其他值即可