.net – API挂钩,在TerminateProcess函数上找到意外的句柄

2019年8月6日 281次阅读

问题

我已经连接TerminateProcess调用以识别正在终止的进程,但是我从TerminateProcess获得了一个与我试图拦截的实际进程句柄不匹配的意外句柄.

我正在使用Deviare库但我认为只要知道TerminateProcess函数如何工作以及我需要做什么来执行正确的句柄比较就可以解决这个问题.

题：

如果我知道我想要识别其终止的进程的句柄,我如何从TerminateProcess函数的hProcess参数中识别该句柄？

码：

请注意我尝试比较句柄的部分：

If Process.GetProcessesByName("notepad").FirstOrDefault.Handle = hProcessValue Then ...

它永远不会是相同的句柄(我也试过MainWindowHandle和进程ID ID)

因此,hProcess参数的值对我来说是未知的.

Imports Nektra.Deviare2

Public NotInheritable Class Form1

Public WithEvents SpyMgr As NktSpyMgr
Public Hook As NktHook

ReadOnly libName As String = "kernel32.dll"
ReadOnly funcName As String = "TerminateProcess"
ReadOnly hookFlags As eNktHookFlags = eNktHookFlags.flgOnlyPreCall

' Processes to attach the hook.
ReadOnly processesToAttach As IEnumerable(Of Process) =
    Process.GetProcessesByName("taskmgr")

Private Sub Test() Handles MyBase.Load

    If Me.processesToAttach.Count = 0 Then
        MsgBox("Any process found.")

    Else
        Me.SpyMgr = New NktSpyMgr()
        Me.SpyMgr.Initialize()

        Me.Hook = SpyMgr.CreateHook(String.Format("{0}!{1}", libName, funcName), hookFlags)
        Me.Hook.Hook(sync:=True)

        For Each proc As Process In processesToAttach
            Debug.WriteLine("Attaching to: " & proc.ProcessName)
            Me.Hook.Attach(procOrId:=proc.Id, sync:=True)
        Next proc

    End If

End Sub

<MTAThread>
Private Sub OnTerminateProcess_Called(ByVal hook As NktHook,
                                      ByVal proc As NktProcess,
                                      ByVal callInfo As NktHookCallInfo) Handles SpyMgr.OnFunctionCalled

    ' Function params.
    Dim hProcessParam As NktParam = DirectCast(callInfo.Params(0), NktParam)
    Dim uExitCodeParam As NktParam = DirectCast(callInfo.Params(1), NktParam)

    ' Param values.
    Dim hProcessValue As IntPtr = New IntPtr(CInt(hProcessParam.Value))
    Dim uExitCodeValue As UInteger = CUInt(uExitCodeParam.Value)

    ' Debuf info.
    Trace.WriteLine(String.Format("hProcess : '{0}'", hProcessValue))
    Trace.WriteLine(String.Format("uExitCode: '{0}'", uExitCodeValue))

    ' Handle Comparison
    If Process.GetProcessesByName("notepad").FirstOrDefault.Handle = hProcessValue Then

        ' Skip precall to avoid process termination.
        If callInfo.IsPreCall Then
            callInfo.Result.Value = 1
            callInfo.SkipCall()
        End If

    End If

End Sub

End Class

研究：

我一直在阅读TerminateProcess的MSDN文档.

注意它所说的部分：

The handle must have the PROCESS_TERMINATE access right

我不确定我是否错过了比较手柄的东西.

我也一直在这里读书,但我没有明白：

Hooking TerminateProcess & Getting Info From The Handle It Supplies

如果可能需要执行良好的句柄比较,我还设计了这个枚举：

    Public Enum ProcessAccessFlags As UInteger
       All = &H1F0FFF
       Terminate = &H1
       CreateThread = &H2
       VirtualMemoryOperation = &H8
       VirtualMemoryRead = &H10
       VirtualMemoryWrite = &H20
       DuplicateHandle = &H40
       CreateProcess = &H80
       SetQuota = &H100
       SetInformation = &H200
       QueryInformation = &H400
       QueryLimitedInformation = &H1000
       Synchronize = &H100000
   End Enum

最佳答案 您的代码假设每个进程只有一个句柄.这个不对.每个进程有一个进程ID.但每当有人请求进程的句柄时,例如使用OpenProcess(…,…,procid),他就会获得一个新的进程句柄(这也取决于所需的访问权限).

因此您无法比较句柄,您应该检查模块名称或进程ID.

点赞