windows:进程查杀
阅读原文时间:2023年07月13日阅读:3

windows平台中,某些进程做了各种保护,比如hook了terminateProcess,又或者注册了进程终止函数的回调。当调用这些API或任务管理器终止该进程时,会被绕过,典型如某些杀毒软件,怎么才能终止这些进程了?

进程是由线程组成的,如果该进程名下所有线程都终止,此进程也会被windows回收和注销,终止进程的问题就转化成了终止线程;但如果直接调用terminateThread,同样面临terminateProcess被hook的窘境。深入逆向分析terminateThread后发现,真正终止线程的函数是PspTerminateThreadByPointer,整个调用逻辑为:NtTerminateThread->PsTerminateSystemThread->PspTerminateThreadByPointer,其中PsTerminateSystemThread是导入未文档化函数,可在驱动层掉用MmGetSystemRoutineAddress函数获取地址,进而得到PspTerminateThreadByPointer的地址(当然也能使用https://www.cnblogs.com/theseventhson/p/13024325.html该方法获取),核心函数如下:

1、根据起始和终止地址、特征码查找代码偏移

PVOID SearchMemory(PVOID pStartAddress, PVOID pEndAddress, PUCHAR pMemoryData, ULONG ulMemoryDataSize)
{
PVOID pAddress = NULL;
PUCHAR i = NULL;
ULONG m = ;

// 扫描内存  
for (i = (PUCHAR)pStartAddress; i < (PUCHAR)pEndAddress; i++)  
{  
    // 判断特征码  
    for (m = ; m < ulMemoryDataSize; m++)  
    {  
        if (\*(PUCHAR)(i + m) != pMemoryData\[m\])  
        {  
            break;  
        }  
    }  
    // 判断是否找到符合特征码的地址  
    if (m >= ulMemoryDataSize)  
    {  
        // 找到特征码位置, 获取紧接着特征码的下一地址  
        pAddress = (PVOID)(i + ulMemoryDataSize);  
        break;  
    }  
}

return pAddress;  

}

2、(1)PsTerminateSystemThread是导出未文档化的函数,可以直接用MmGetSystemRoutineAddress得到函数地址

(2)windbg中根据PsTerminateSystemThread进一步查找PspTerminateThreadByPointer:这里用了e8作为特征码,直接定位到“e8dcf0fbff      call    nt!PspTerminateThreadByPointer (fffff803`d01c6210)”这行代码;

kd> u 0xfffff803`d0207110   //下面偏移x20 = 32byte处

nt!PsTerminateSystemThread:

fffff803`d0207110 4883ec28        sub     rsp,28h

fffff803`d0207114 8bd1            mov     edx,ecx

fffff803`d0207116 65488b0c2588010000 mov   rcx,qword ptr gs:[188h]

fffff803`d020711f f7417400040000  test    dword ptr [rcx+74h],400h

fffff803`d0207126 0f84a0630e00    je      nt!PsTerminateSystemThread+0xe63bc (fffff803`d02ed4cc)

fffff803`d020712c 41b001          mov     r8b,1

fffff803`d020712f e8dcf0fbff      call    nt!PspTerminateThreadByPointer (fffff803`d01c6210)

  熟悉x86汇编的都知道:e8是call的硬编码,后面dcf0fbff是目标地址当对于当前的偏移,偏移为0xfffbf0dc。这个偏移很大,根据经验判断应该是个负数,0n-266020,那么PspTerminateThreadByPointer的计算方法:

  PspTerminateThreadByPointer =  当前地址 + 4 + 偏移(负数)

=0xfffff800`63f7e130 + 0x4 + 0n-266020

= ‭FFFFF80063F7E134‬ + 0n-266020

= -8,794,415,832,780 - 266020 //统一转成10进制

= -8,794,416,098,800‬

= FFFF F800 63F3 D210‬

继续windbg查一下:发现这个地址确实是PspTerminateThreadByPointer的,没错:

kd> u 0xfffff800`63f3d210

nt!PspTerminateThreadByPointer:

fffff800`63f3d210 48895c2408      mov     qword ptr [rsp+8],rbx

fffff800`63f3d215 48896c2410      mov     qword ptr [rsp+10h],rbp

fffff800`63f3d21a 4889742418      mov     qword ptr [rsp+18h],rsi

fffff800`63f3d21f 57              push    rdi

fffff800`63f3d220 4883ec30        sub     rsp,30h

fffff800`63f3d224 8b81d0060000    mov     eax,dword ptr [rcx+6D0h]

fffff800`63f3d22a 418ae8          mov     bpl,r8b

fffff800`63f3d22d 488bb920020000  mov     rdi,qword ptr [rcx+220h]

  详细代码如下(这里pSpecialData用E8就好):

PVOID SearchPspTerminateThreadByPointer(PUCHAR pSpecialData, ULONG ulSpecialDataSize)
{
UNICODE_STRING ustrFuncName;
PVOID pAddress = NULL;
LONG lOffset = ;
PVOID pPsTerminateSystemThread = NULL;
PVOID pPspTerminateThreadByPointer = NULL;

// 先获取 PsTerminateSystemThread 函数地址  
RtlInitUnicodeString(&ustrFuncName, L"PsTerminateSystemThread");  
pPsTerminateSystemThread = MmGetSystemRoutineAddress(&ustrFuncName);  
if (NULL == pPsTerminateSystemThread)  
{  
    ShowError("MmGetSystemRoutineAddress", );  
    return pPspTerminateThreadByPointer;  
}

// 然后, 查找 PspTerminateThreadByPointer 函数地址  
pAddress = SearchMemory(pPsTerminateSystemThread,  
    (PVOID)((PUCHAR)pPsTerminateSystemThread + 0xFF),//搜索255字节长度  
    pSpecialData, ulSpecialDataSize);  
if (NULL == pAddress)  
{  
    ShowError("SearchMemory", );  
    return pPspTerminateThreadByPointer;  
}

// 先获取偏移, 再计算地址  
lOffset = \*(PLONG)pAddress;//0n-266020。注意这里向前跳,偏移是负数,有符号  
pPspTerminateThreadByPointer = (PVOID)((PUCHAR)pAddress + sizeof(LONG) + lOffset);

return pPspTerminateThreadByPointer;  

}

3、得到PspTerminateThreadByPointer地址:

PVOID GetPspLoadImageNotifyRoutine()
{
PVOID pPspTerminateThreadByPointerAddress = NULL;
RTL_OSVERSIONINFOW osInfo = { };
UCHAR pSpecialData[] = { };
ULONG ulSpecialDataSize = ;

pSpecialData\[\] = 0xE8;  
ulSpecialDataSize = ;

// E8  
pSpecialData\[\] = 0xE8;  
ulSpecialDataSize = ;

// 根据特征码获取地址  
pPspTerminateThreadByPointerAddress = SearchPspTerminateThreadByPointer(pSpecialData, ulSpecialDataSize);  
return pPspTerminateThreadByPointerAddress;  

}

4、现在可以强杀进程了:

// 强制结束指定进程
NTSTATUS ForceKillProcess(HANDLE hProcessId)
{
PVOID pPspTerminateThreadByPointerAddress = NULL;
PEPROCESS pEProcess = NULL;
PETHREAD pEThread = NULL;
PEPROCESS pThreadEProcess = NULL;
NTSTATUS status = STATUS_SUCCESS;
ULONG i = ;

#ifdef _WIN64
// 64 位
typedef NTSTATUS(__fastcall *PSPTERMINATETHREADBYPOINTER) (PETHREAD pEThread, NTSTATUS ntExitCode, BOOLEAN bDirectTerminate);
#else
// 32 位
typedef NTSTATUS(*PSPTERMINATETHREADBYPOINTER) (PETHREAD pEThread, NTSTATUS ntExitCode, BOOLEAN bDirectTerminate);
#endif

// 获取 PspTerminateThreadByPointer 函数地址  
pPspTerminateThreadByPointerAddress = GetPspLoadImageNotifyRoutine();  
if (NULL == pPspTerminateThreadByPointerAddress)  
{  
    ShowError("GetPspLoadImageNotifyRoutine", );  
    return FALSE;  
}  
// 获取结束进程的进程结构对象EPROCESS  
status = PsLookupProcessByProcessId(hProcessId, &pEProcess);  
if (!NT\_SUCCESS(status))  
{  
    ShowError("PsLookupProcessByProcessId", status);  
    return status;  
}  
// 遍历所有线程, 并结束所有指定进程的线程  
for (i = ; i < 0x80000; i = i + )  
{  
    status = PsLookupThreadByThreadId((HANDLE)i, &pEThread);  
    if (NT\_SUCCESS(status))  
    {  
        // 获取线程对应的进程结构对象  
        pThreadEProcess = PsGetThreadProcess(pEThread);  
        // 结束指定进程的线程  
        if (pEProcess == pThreadEProcess)  
        {  
            ((PSPTERMINATETHREADBYPOINTER)pPspTerminateThreadByPointerAddress)(pEThread, , );  
            DbgPrint("PspTerminateThreadByPointer Thread:%d\\n", i);  
        }  
        // 凡是Lookup...,必需Dereference,否则在某些时候会造成蓝屏  
        ObDereferenceObject(pEThread);  
    }  
}  
// 凡是Lookup...,必需Dereference,否则在某些时候会造成蓝屏  
ObDereferenceObject(pEProcess);

return status;  

}

5、测试环境:

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