进程保护--CrossThreadFlags标志位

原理：

1. 将进程的所有线程的线程CrossThreadFlags标志位设置成Terminated或者System.

效果：任务管理器，WSYSCheck，ICESWORD无法结束进程。。

但PCHunter 可以结束受保护的进程。但PCHunter无法用普通方法结束受保护的线程，必须使用强制结束线程才可结束线程。。

 

代码：

VOID SetThreadFlagToTerminatedByThreadID(ULONG dwThreadID)
{
    ULONG ulFlagOffset;
    NTSTATUS status = STATUS_UNSUCCESSFUL;
    PULONG pFlag;
    PETHREAD eThead;
    HANDLE threadHandle;


    __try{
        threadHandle = (HANDLE)dwThreadID;
        ulFlagOffset = GetCrossThreadFlagOffset();
        //dprintf("[ProtectProcess]GetCrossThreadFlagOffset: 0X%08X
", ulFlagOffset);

        status = PsLookupThreadByThreadId(threadHandle, &eThead);
        if(!NT_SUCCESS(status))
        {

            dprintf("PsLookupThreadByThreadId ERRORid:0X%08X, TID: 0X%08X
", status, dwThreadID);
            return status;
        }
        //dprintf("ETHREAD:0X%08X
", eThead);

        pFlag = (ULONG*)((PUCHAR)eThead + ulFlagOffset);
        //dprintf("ulFlag address:0X%08X value:0x%08X
", pFlag, *pFlag);

        *pFlag |= PS_CROSS_THREAD_FLAGS_TERMINATED;
        dprintf("new ulFlag address:0X%08X value:0x%08X
", pFlag, *pFlag);
    }__except(EXCEPTION_EXECUTE_HANDLER)
    {
        dprintf("EXCEPTION ON set thread cross flags!");
        return status;
    }
}

VOID SetThreadFlagToTerminatedByThreadID(ULONG dwThreadID)
{
	ULONG ulFlagOffset;
	NTSTATUS status = STATUS_UNSUCCESSFUL;
	PULONG pFlag;
	PETHREAD eThead;
	HANDLE threadHandle;


	__try{
		threadHandle = (HANDLE)dwThreadID;
		ulFlagOffset = GetCrossThreadFlagOffset();
		//dprintf("[ProtectProcess]GetCrossThreadFlagOffset: 0X%08X
", ulFlagOffset);

		status = PsLookupThreadByThreadId(threadHandle, &eThead);
		if(!NT_SUCCESS(status))
		{

			dprintf("PsLookupThreadByThreadId ERRORid:0X%08X, TID: 0X%08X
", status, dwThreadID);
			return status;
		}
		//dprintf("ETHREAD:0X%08X
", eThead);

		pFlag = (ULONG*)((PUCHAR)eThead + ulFlagOffset);
		//dprintf("ulFlag address:0X%08X value:0x%08X
", pFlag, *pFlag);

		*pFlag |= PS_CROSS_THREAD_FLAGS_TERMINATED;
		dprintf("new ulFlag address:0X%08X value:0x%08X
", pFlag, *pFlag);
	}__except(EXCEPTION_EXECUTE_HANDLER)
	{
		dprintf("EXCEPTION ON set thread cross flags!");
		return status;
	}
}

ring3程序与ring0程序下载地址：

http://download.csdn.net/detail/xiaocaiju/8192897

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