├── Hybrid.bas ├── LICENSE ├── README.md ├── hybrid.jpg ├── x64PebPOC_small.jpg ├── x64Peb_POC.jpg └── x64_PEB_poc.bas /Hybrid.bas: -------------------------------------------------------------------------------- 1 | Attribute VB_Name = "Module1" 2 | 3 | Private Declare PtrSafe Sub Peek Lib "msvcrt" Alias "memcpy" (ByRef pDest As Any, ByRef pSource As Any, ByVal nBytes As Long) 4 | 5 | Private Declare PtrSafe Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As LongPtr 6 | 7 | 8 | Sub ReturnAddresses() 9 | 10 | Dim Ldr_Data_Table_Entry_BaseDllName_BufferAdr As LongPtr 11 | 12 | Dim IMAGE_EXPORT_DIRECTORY As LongPtr 13 | Dim IMAGE_EXPORT_DIRECTORY_Adr_of_Functions As LongPtr 14 | Dim IMAGE_EXPORT_DIRECTORY_FunctionStart As LongPtr 15 | Dim IMAGE_EXPORT_DIRECTORY_FunctionStartAdr As LongPtr 16 | 17 | Dim AS_String_Adr As LongPtr 18 | Dim AS_Buffer_Adr As LongPtr 19 | 20 | Dim Temp As Long 21 | 22 | Ldr_Data_Table_Entry_BaseDllAdr = LoadLibrary("amsi.dll") 23 | 24 | IMAGE_EXPORT_DIRECTORY = Ldr_Data_Table_Entry_BaseDllAdr + "58560" 'E4C0 25 | 'Debug.Print "IMAGE_EXPORT_DIRECTORY: " & Hex(IMAGE_EXPORT_DIRECTORY) 26 | 27 | IMAGE_EXPORT_DIRECTORY_Adr_of_Functions = (IMAGE_EXPORT_DIRECTORY + &H1C) 28 | 'Debug.Print "IMAGE_EXPORT_DIRECTORY_Adr_of_Functions: " & Hex(IMAGE_EXPORT_DIRECTORY_Adr_of_Functions) 29 | 30 | Peek IMAGE_EXPORT_DIRECTORY_FunctionStart, ByVal (IMAGE_EXPORT_DIRECTORY_Adr_of_Functions), 4 31 | 'Debug.Print Hex(IMAGE_EXPORT_DIRECTORY_FunctionStart) 32 | 33 | IMAGE_EXPORT_DIRECTORY_FunctionStartAdr = Ldr_Data_Table_Entry_BaseDllAdr + IMAGE_EXPORT_DIRECTORY_FunctionStart 34 | 'Debug.Print "Function Addresses Start at:" & Hex(IMAGE_EXPORT_DIRECTORY_FunctionStartAdr) 35 | 36 | Peek Temp, ByVal (IMAGE_EXPORT_DIRECTORY_FunctionStartAdr + 12), 4 37 | AS_Buffer_Adr = Ldr_Data_Table_Entry_BaseDllAdr + Temp 38 | Debug.Print "Amsi Scan Buffer Found at:" & Hex(AS_Buffer_Adr) 39 | 40 | Peek Temp, ByVal (IMAGE_EXPORT_DIRECTORY_FunctionStartAdr + 16), 4 41 | AS_String_Adr = Ldr_Data_Table_Entry_BaseDllAdr + Temp 42 | Debug.Print "Amsi Scan String Found at:" & Hex(AS_String_Adr) 43 | 44 | End Sub 45 | 46 | 47 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # AmsiPEBWalkVBAx64 2 | 3 | Walking the PEB in VBA x64 Office 4 | 5 | Blog Post about x32, x64 still to come. Basically the same just offsets are slightly different. 6 | https://secureyourit.co.uk/wp/2020/04/12/walking-the-peb-with-vba-x64/ 7 | 8 | ![HashMatch](https://github.com/rmdavy/AmsiPEBWalkVBAx64/blob/master/x64Peb_POC.jpg) 9 | -------------------------------------------------------------------------------- /hybrid.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/rmdavy/AmsiPEBWalkVBAx64/f44442d31021fd76cb60ed589079fcb25ce79f09/hybrid.jpg -------------------------------------------------------------------------------- /x64PebPOC_small.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/rmdavy/AmsiPEBWalkVBAx64/f44442d31021fd76cb60ed589079fcb25ce79f09/x64PebPOC_small.jpg -------------------------------------------------------------------------------- /x64Peb_POC.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/rmdavy/AmsiPEBWalkVBAx64/f44442d31021fd76cb60ed589079fcb25ce79f09/x64Peb_POC.jpg -------------------------------------------------------------------------------- /x64_PEB_poc.bas: -------------------------------------------------------------------------------- 1 | Attribute VB_Name = "Module1" 2 | Private Type ProcessWow64Information 3 | ExitStatus As LongPtr 4 | Reserved0 As LongPtr 5 | PebBaseAddress As LongPtr 6 | AffinityMask As LongPtr 7 | BasePriority As LongPtr 8 | Reserved1 As LongPtr 9 | UniqueProcessId As LongPtr 10 | InheritedFromUniqueProcessId As LongPtr 11 | End Type 12 | 13 | Private Declare PtrSafe Function ZwQueryInformationProcess Lib "ntdll.dll" ( _ 14 | ByVal ProcessHandle As LongPtr, _ 15 | ByVal ProcessInformationClass As LongPtr, _ 16 | ByRef ProcessInformation As ProcessWow64Information, _ 17 | ByVal ProcessInformationLength As Long, _ 18 | ByRef ReturnLength As Long _ 19 | ) As Integer 20 | 21 | Declare PtrSafe Sub Peek Lib "msvcrt" Alias "memcpy" (ByRef pDest As Any, ByRef pSource As Any, ByVal nBytes As Long) 22 | 23 | Sub POC() 24 | 25 | Dim size As Long 26 | Dim pbi As ProcessWow64Information 27 | Dim dll_table_entry As LongPtr 28 | Dim current_dll_table_entry As LongPtr 29 | 30 | Dim Ldr_Data As LongPtr 31 | Dim Ldr_Data_InLoadOrderModuleList_Start As LongPtr 32 | Dim Ldr_Data_InLoadOrderModuleList_End As LongPtr 33 | Dim Ldr_Data_Table_Entry_BaseDll As LongPtr 34 | Dim Ldr_Data_Table_Entry_BaseDllAdr As LongPtr 35 | 36 | Dim Ldr_Data_Table_Entry_BaseDllName As LongPtr 37 | Dim Ldr_Data_Table_Entry_BaseDllName_Buffer As LongPtr 38 | Dim Ldr_Data_Table_Entry_BaseDllName_BufferAdr As LongPtr 39 | 40 | Dim IMAGE_EXPORT_DIRECTORY As LongPtr 41 | Dim IMAGE_EXPORT_DIRECTORY_Adr_of_Functions As LongPtr 42 | Dim IMAGE_EXPORT_DIRECTORY_FunctionStart As LongPtr 43 | Dim IMAGE_EXPORT_DIRECTORY_FunctionStartAdr As LongPtr 44 | 45 | Dim AS_String_Adr As LongPtr 46 | Dim AS_Buffer_Adr As LongPtr 47 | 48 | Dim Temp As Long 49 | Dim Result As String 50 | Dim btg As LongPtr 51 | Dim i As Integer 52 | 53 | Result = ZwQueryInformationProcess(-1, 0, pbi, Len(pbi), size) 54 | Debug.Print "PEB Address: " & Hex(pbi.PebBaseAddress) 55 | 56 | Peek Ldr_Data, ByVal (pbi.PebBaseAddress + &H18), 8 57 | Debug.Print "Ldr_Data: " & Hex(Ldr_Data) 58 | 59 | Peek Ldr_Data_InLoadOrderModuleList_Start, ByVal (Ldr_Data + &H10), 8 60 | Debug.Print "Ldr_Data_InLoadOrderModuleList_Start: " & Hex(Ldr_Data_InLoadOrderModuleList_Start) 61 | 62 | Peek Ldr_Data_InLoadOrderModuleList_End, ByVal (Ldr_Data + &H18), 8 63 | Debug.Print "Ldr_Data_InLoadOrderModuleList_End: " & Hex(Ldr_Data_InLoadOrderModuleList_End) 64 | 65 | dll_table_entry = Ldr_Data_InLoadOrderModuleList_Start 66 | Do Until dll_table_entry = Ldr_Data_InLoadOrderModuleList_End 67 | current_dll_table_entry = dll_table_entry 68 | 69 | Peek dll_table_entry, ByVal (current_dll_table_entry), 8 70 | 'Debug.Print Hex(dll_table_entry) 71 | 72 | Ldr_Data_Table_Entry_BaseDll = current_dll_table_entry + &H30 73 | Peek Ldr_Data_Table_Entry_BaseDllAdr, ByVal (Ldr_Data_Table_Entry_BaseDll), 8 74 | 75 | Ldr_Data_Table_Entry_BaseDllName = current_dll_table_entry + &H58 76 | Ldr_Data_Table_Entry_BaseDllName_Buffer = Ldr_Data_Table_Entry_BaseDllName + &H8 77 | 78 | Peek Ldr_Data_Table_Entry_BaseDllName_BufferAdr, ByVal (Ldr_Data_Table_Entry_BaseDllName_Buffer), 8 79 | 'Debug.Print Hex(Ldr_Data_Table_Entry_BaseDllName_BufferAdr) 80 | 81 | Result = "" 82 | For i = 0 To 4 83 | btg = Ldr_Data_Table_Entry_BaseDllName_BufferAdr + (i * 4) 84 | Peek Temp, ByVal (btg), 4 85 | Result = Result & StringBuilder(Temp) 86 | Next i 87 | 88 | If InStr(1, Result, "616D73692E646C6C", vbTextCompare) Then 89 | Debug.Print "We've found amsi.dll" 90 | Debug.Print "Current DLL Table Entry: " & Hex(current_dll_table_entry) 91 | Debug.Print "DLL Base Address: " & Hex(Ldr_Data_Table_Entry_BaseDllAdr) 92 | 93 | IMAGE_EXPORT_DIRECTORY = Ldr_Data_Table_Entry_BaseDllAdr + "58560" 'E4C0 94 | 'Debug.Print "IMAGE_EXPORT_DIRECTORY: " & Hex(IMAGE_EXPORT_DIRECTORY) 95 | 96 | IMAGE_EXPORT_DIRECTORY_Adr_of_Functions = (IMAGE_EXPORT_DIRECTORY + &H1C) 97 | 'Debug.Print "IMAGE_EXPORT_DIRECTORY_Adr_of_Functions: " & Hex(IMAGE_EXPORT_DIRECTORY_Adr_of_Functions) 98 | 99 | Peek IMAGE_EXPORT_DIRECTORY_FunctionStart, ByVal (IMAGE_EXPORT_DIRECTORY_Adr_of_Functions), 4 100 | 'Debug.Print Hex(IMAGE_EXPORT_DIRECTORY_FunctionStart) 101 | 102 | IMAGE_EXPORT_DIRECTORY_FunctionStartAdr = Ldr_Data_Table_Entry_BaseDllAdr + IMAGE_EXPORT_DIRECTORY_FunctionStart 103 | Debug.Print "Function Addresses Start at:" & Hex(IMAGE_EXPORT_DIRECTORY_FunctionStartAdr) 104 | 105 | Peek Temp, ByVal (IMAGE_EXPORT_DIRECTORY_FunctionStartAdr + 12), 4 106 | AS_Buffer_Adr = Ldr_Data_Table_Entry_BaseDllAdr + Temp 107 | Debug.Print "Amsi Scan Buffer Found at:" & Hex(AS_Buffer_Adr) 108 | 109 | Peek Temp, ByVal (IMAGE_EXPORT_DIRECTORY_FunctionStartAdr + 16), 4 110 | AS_String_Adr = Ldr_Data_Table_Entry_BaseDllAdr + Temp 111 | Debug.Print "Amsi Scan String Found at:" & Hex(AS_String_Adr) 112 | 113 | Exit Do 114 | End If 115 | 116 | Loop 117 | 118 | End Sub 119 | 120 | Function StringBuilder(Bytes As Long) As String 121 | 122 | firstbytes = Hex(Bytes) 123 | 124 | firstbytes = Replace(firstbytes, "00", "") 125 | If Len(firstbytes) = 4 Then 126 | b1 = Mid(firstbytes, 1, 2) 127 | b2 = Mid(firstbytes, 3, 2) 128 | firstbytes = b2 & b1 129 | End If 130 | 131 | StringBuilder = firstbytes 132 | 133 | End Function 134 | 135 | 136 | 137 | 138 | 139 | --------------------------------------------------------------------------------