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August 30, 2024 20:48
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| #include <windows.h> | |
| #include <stdio.h> | |
| typedef struct ldr_data_entry | |
| { | |
| LIST_ENTRY LinkedList; | |
| LIST_ENTRY UnusedList; | |
| PVOID BaseAddress; | |
| PVOID Reserved2[1]; | |
| PVOID DllBase; | |
| PVOID EntryPoint; | |
| PVOID Reserved3; | |
| USHORT DllNameLength; | |
| USHORT DllNameMaximumLength; | |
| PWSTR DllNameBuffer; | |
| } ldr_data_entry; | |
| typedef struct ldr_data { | |
| char Padding1[0x20]; | |
| ldr_data_entry *LoaderDataEntry; | |
| } ldr_data; | |
| typedef struct peb | |
| { | |
| char Padding1[0x18]; | |
| ldr_data *LoaderData; | |
| } peb; | |
| typedef struct teb | |
| { | |
| char Padding[0x60]; | |
| peb *PEB; | |
| } teb; | |
| typedef int function_to_load(void); | |
| __declspec(dllexport) int FunctionToLoad(void) { | |
| return 3; | |
| } | |
| static int StringsAreEqualCaseInsensitive(wchar_t *A, size_t ALength, wchar_t *B, size_t BLength) { | |
| int Result = (ALength == BLength); | |
| if(Result) { | |
| for(size_t Index = 0; Index < ALength; ++Index) { | |
| wchar_t Ac = A[Index]; | |
| wchar_t Bc = B[Index]; | |
| if((Ac >= 'A') && (Ac <= 'Z')) { | |
| Ac += 'a' - 'A'; | |
| } | |
| if((Bc >= 'A') && (Bc <= 'Z')) { | |
| Bc += 'a' - 'A'; | |
| } | |
| if(Ac != Bc) { | |
| Result = 0; | |
| break; | |
| } | |
| } | |
| } | |
| return Result; | |
| } | |
| #define EXE_NAME L"peb_trickery.exe" | |
| int main(int ArgumentCount, char **Arguments) { | |
| wchar_t MyName[] = EXE_NAME; | |
| teb *Teb = (teb *)__readgsqword(0x30); | |
| peb *Peb = (peb *)(Teb + 0x60); | |
| ldr_data_entry *Entry = Teb->PEB->LoaderData->LoaderDataEntry; | |
| while(Entry->DllBase) { | |
| if(StringsAreEqualCaseInsensitive(Entry->DllNameBuffer, Entry->DllNameLength / 2, MyName, (sizeof(MyName) - 2) / 2)) { | |
| ZeroMemory(Entry->DllNameBuffer, Entry->DllNameLength); | |
| break; | |
| } | |
| Entry = (ldr_data_entry*)(Entry->LinkedList.Flink); | |
| } | |
| HMODULE Myself = LoadLibraryW(MyName); | |
| if(Myself) { | |
| function_to_load *Loaded = (function_to_load *)GetProcAddress(Myself, "FunctionToLoad"); | |
| if(Loaded) { | |
| int Result = Loaded(); | |
| printf("%d\n", Result); | |
| } | |
| } | |
| return 0; | |
| } |
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