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diff --git a/Scylla/IATReferenceScan.cpp b/Scylla/IATReferenceScan.cpp
index c61c213..9795953 100644
--- a/Scylla/IATReferenceScan.cpp
+++ b/Scylla/IATReferenceScan.cpp
@@ -1,743 +1,767 @@
#include "IATReferenceScan.h"
#include "Scylla.h"
#include "Architecture.h"
#include <set>
//#define DEBUG_COMMENTS
FileLog IATReferenceScan::directImportLog(L"Scylla_direct_imports.log");
int IATReferenceScan::numberOfFoundDirectImports()
{
return (int)iatDirectImportList.size();
}
int IATReferenceScan::numberOfFoundUniqueDirectImports()
{
std::set<DWORD_PTR> apiPointers;
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
IATReference * ref = &(*iter);
apiPointers.insert(ref->targetAddressInIat);
}
return (int)apiPointers.size();
}
int IATReferenceScan::numberOfDirectImportApisNotInIat()
{
std::set<DWORD_PTR> apiPointers;
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
IATReference * ref = &(*iter);
if (ref->targetPointer == 0)
{
apiPointers.insert(ref->targetAddressInIat);
}
}
return (int)apiPointers.size();
}
int IATReferenceScan::getSizeInBytesOfJumpTableInSection()
{
return (numberOfFoundUniqueDirectImports() * 6); //for x86 and x64 the same size, FF25 00000000
}
void IATReferenceScan::startScan(DWORD_PTR imageBase, DWORD imageSize, DWORD_PTR iatAddress, DWORD iatSize)
{
MEMORY_BASIC_INFORMATION memBasic = {0};
IatAddressVA = iatAddress;
IatSize = iatSize;
ImageBase = imageBase;
ImageSize = imageSize;
if (ScanForNormalImports)
{
iatReferenceList.clear();
iatReferenceList.reserve(200);
}
if (ScanForDirectImports)
{
iatDirectImportList.clear();
iatDirectImportList.reserve(50);
}
DWORD_PTR section = imageBase;
do
{
if (!VirtualQueryEx(ProcessAccessHelp::hProcess, (LPCVOID)section, &memBasic, sizeof(MEMORY_BASIC_INFORMATION)))
{
#ifdef DEBUG_COMMENTS
Scylla::debugLog.log(L"VirtualQueryEx failed %d", GetLastError());
#endif
break;
}
else
{
if (isPageExecutable(memBasic.Protect))
{
//do read and scan
scanMemoryPage(memBasic.BaseAddress, memBasic.RegionSize);
}
}
section = (DWORD_PTR)((SIZE_T)section + memBasic.RegionSize);
} while (section < (imageBase + imageSize));
}
//void IATReferenceScan::patchNewIatBaseMemory(DWORD_PTR newIatBaseAddress)
//{
// NewIatAddressVA = newIatBaseAddress;
//
// for (std::vector<IATReference>::iterator iter = iatReferenceList.begin(); iter != iatReferenceList.end(); iter++)
// {
// patchReferenceInMemory(&(*iter));
// }
//}
//
//void IATReferenceScan::patchNewIatBaseFile(DWORD_PTR newIatBaseAddress)
//{
// NewIatAddressVA = newIatBaseAddress;
//
// for (std::vector<IATReference>::iterator iter = iatReferenceList.begin(); iter != iatReferenceList.end(); iter++)
// {
// patchReferenceInFile(&(*iter));
// }
//}
void IATReferenceScan::patchDirectImportsMemory( bool junkByteAfterInstruction )
{
JunkByteAfterInstruction = junkByteAfterInstruction;
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
patchDirectImportInMemory(&(*iter));
}
}
bool IATReferenceScan::isPageExecutable( DWORD Protect )
{
if (Protect & PAGE_NOCACHE) Protect ^= PAGE_NOCACHE;
if (Protect & PAGE_WRITECOMBINE) Protect ^= PAGE_WRITECOMBINE;
switch(Protect)
{
case PAGE_EXECUTE:
{
return true;
}
case PAGE_EXECUTE_READ:
{
return true;
}
case PAGE_EXECUTE_READWRITE:
{
return true;
}
case PAGE_EXECUTE_WRITECOPY:
{
return true;
}
default:
return false;
}
}
void IATReferenceScan::scanMemoryPage( PVOID BaseAddress, SIZE_T RegionSize )
{
BYTE * dataBuffer = (BYTE *)calloc(RegionSize, 1);
BYTE * currentPos = dataBuffer;
int currentSize = (int)RegionSize;
DWORD_PTR currentOffset = (DWORD_PTR)BaseAddress;
_DecodeResult res;
unsigned int instructionsCount = 0, next = 0;
if (!dataBuffer)
return;
if (ProcessAccessHelp::readMemoryFromProcess((DWORD_PTR)BaseAddress, RegionSize, (LPVOID)dataBuffer))
{
while (1)
{
ZeroMemory(&ProcessAccessHelp::decomposerCi, sizeof(_CodeInfo));
ProcessAccessHelp::decomposerCi.code = currentPos;
ProcessAccessHelp::decomposerCi.codeLen = currentSize;
ProcessAccessHelp::decomposerCi.dt = ProcessAccessHelp::dt;
ProcessAccessHelp::decomposerCi.codeOffset = currentOffset;
instructionsCount = 0;
res = distorm_decompose(&ProcessAccessHelp::decomposerCi, ProcessAccessHelp::decomposerResult, sizeof(ProcessAccessHelp::decomposerResult)/sizeof(ProcessAccessHelp::decomposerResult[0]), &instructionsCount);
if (res == DECRES_INPUTERR)
{
break;
}
for (unsigned int i = 0; i < instructionsCount; i++)
{
if (ProcessAccessHelp::decomposerResult[i].flags != FLAG_NOT_DECODABLE)
{
analyzeInstruction(&ProcessAccessHelp::decomposerResult[i]);
}
}
if (res == DECRES_SUCCESS) break; // All instructions were decoded.
else if (instructionsCount == 0) break;
next = (unsigned long)(ProcessAccessHelp::decomposerResult[instructionsCount-1].addr - ProcessAccessHelp::decomposerResult[0].addr);
if (ProcessAccessHelp::decomposerResult[instructionsCount-1].flags != FLAG_NOT_DECODABLE)
{
next += ProcessAccessHelp::decomposerResult[instructionsCount-1].size;
}
currentPos += next;
currentOffset += next;
currentSize -= next;
}
}
free(dataBuffer);
}
void IATReferenceScan::analyzeInstruction( _DInst * instruction )
{
if (ScanForNormalImports)
{
findNormalIatReference(instruction);
}
if (ScanForDirectImports)
{
findDirectIatReferenceMov(instruction);
#ifndef _WIN64
findDirectIatReferenceCallJmp(instruction);
findDirectIatReferenceLea(instruction);
findDirectIatReferencePush(instruction);
#endif
}
}
void IATReferenceScan::findNormalIatReference( _DInst * instruction )
{
#ifdef DEBUG_COMMENTS
_DecodedInst inst;
#endif
IATReference ref;
if (META_GET_FC(instruction->meta) == FC_CALL || META_GET_FC(instruction->meta) == FC_UNC_BRANCH)
{
if (instruction->size >= 5)
{
if (META_GET_FC(instruction->meta) == FC_CALL)
{
ref.type = IAT_REFERENCE_PTR_CALL;
}
else
{
ref.type = IAT_REFERENCE_PTR_JMP;
}
ref.addressVA = (DWORD_PTR)instruction->addr;
ref.instructionSize = instruction->size;
#ifdef _WIN64
if (instruction->flags & FLAG_RIP_RELATIVE)
{
#ifdef DEBUG_COMMENTS
distorm_format(&ProcessAccessHelp::decomposerCi, instruction, &inst);
Scylla::debugLog.log(PRINTF_DWORD_PTR_FULL L" " PRINTF_DWORD_PTR_FULL L" %S %S %d %d - target address: " PRINTF_DWORD_PTR_FULL, (DWORD_PTR)instruction->addr, ImageBase, inst.mnemonic.p, inst.operands.p, instruction->ops[0].type, instruction->size, INSTRUCTION_GET_RIP_TARGET(instruction));
#endif
if (INSTRUCTION_GET_RIP_TARGET(instruction) >= IatAddressVA && INSTRUCTION_GET_RIP_TARGET(instruction) < (IatAddressVA + IatSize))
{
ref.targetPointer = INSTRUCTION_GET_RIP_TARGET(instruction);
getIatEntryAddress(&ref);
//Scylla::debugLog.log(L"iat entry "PRINTF_DWORD_PTR_FULL,ref.targetAddressInIat);
iatReferenceList.push_back(ref);
}
}
#else
if (instruction->ops[0].type == O_DISP)
{
//jmp dword ptr || call dword ptr
#ifdef DEBUG_COMMENTS
distorm_format(&ProcessAccessHelp::decomposerCi, instruction, &inst);
Scylla::debugLog.log(PRINTF_DWORD_PTR_FULL L" " PRINTF_DWORD_PTR_FULL L" %S %S %d %d - target address: " PRINTF_DWORD_PTR_FULL, (DWORD_PTR)instruction->addr, ImageBase, inst.mnemonic.p, inst.operands.p, instruction->ops[0].type, instruction->size, instruction->disp);
#endif
if (instruction->disp >= IatAddressVA && instruction->disp < (IatAddressVA + IatSize))
{
ref.targetPointer = (DWORD_PTR)instruction->disp;
getIatEntryAddress(&ref);
//Scylla::debugLog.log(L"iat entry "PRINTF_DWORD_PTR_FULL,ref.targetAddressInIat);
iatReferenceList.push_back(ref);
}
}
#endif
}
}
}
void IATReferenceScan::getIatEntryAddress( IATReference * ref )
{
if (!ProcessAccessHelp::readMemoryFromProcess(ref->targetPointer, sizeof(DWORD_PTR), &ref->targetAddressInIat))
{
ref->targetAddressInIat = 0;
}
}
bool IATReferenceScan::isAddressValidImageMemory( DWORD_PTR address )
{
MEMORY_BASIC_INFORMATION memBasic = {0};
if (!VirtualQueryEx(ProcessAccessHelp::hProcess, (LPCVOID)address, &memBasic, sizeof(MEMORY_BASIC_INFORMATION)))
{
return false;
}
return (memBasic.Type == MEM_IMAGE && isPageExecutable(memBasic.Protect));
}
void IATReferenceScan::patchReferenceInMemory( IATReference * ref )
{
DWORD_PTR newIatAddressPointer = ref->targetPointer - IatAddressVA + NewIatAddressRVA;
DWORD patchBytes = 0;
#ifdef _WIN64
patchBytes = (DWORD)(newIatAddressPointer - ref->addressVA - 6);
#else
patchBytes = newIatAddressPointer;
#endif
ProcessAccessHelp::writeMemoryToProcess(ref->addressVA + 2, sizeof(DWORD), &patchBytes);
}
void IATReferenceScan::patchDirectImportInMemory( IATReference * ref )
{
DWORD patchBytes = 0;
BYTE patchPreBytes[2];
if (ref->targetPointer)
{
patchPreBytes[0] = 0xFF;
if (ref->type == IAT_REFERENCE_DIRECT_CALL) //FF15
{
patchPreBytes[1] = 0x15;
}
else if (ref->type == IAT_REFERENCE_DIRECT_JMP) //FF25
{
patchPreBytes[1] = 0x25;
}
else
{
return;
}
if (!JunkByteAfterInstruction)
{
ref->addressVA -= 1;
}
ProcessAccessHelp::writeMemoryToProcess(ref->addressVA, 2, patchPreBytes);
#ifdef _WIN64
patchBytes = (DWORD)(ref->targetPointer - ref->addressVA - 6);
#else
patchBytes = ref->targetPointer;
#endif
ProcessAccessHelp::writeMemoryToProcess(ref->addressVA + 2, sizeof(DWORD), &patchBytes);
}
}
DWORD_PTR IATReferenceScan::lookUpIatForPointer( DWORD_PTR addr )
{
if (!iatBackup)
{
iatBackup = (DWORD_PTR *)calloc(IatSize + sizeof(DWORD_PTR), 1);
if (!iatBackup)
{
return 0;
}
if (!ProcessAccessHelp::readMemoryFromProcess(IatAddressVA, IatSize, iatBackup))
{
free(iatBackup);
iatBackup = 0;
return 0;
}
}
for (int i = 0; i < ((int)IatSize / (int)sizeof(DWORD_PTR));i++)
{
if (iatBackup[i] == addr)
{
return (DWORD_PTR)&iatBackup[i] - (DWORD_PTR)iatBackup + IatAddressVA;
}
}
return 0;
}
void IATReferenceScan::patchNewIat(DWORD_PTR stdImagebase, DWORD_PTR newIatBaseAddress, PeParser * peParser)
{
NewIatAddressRVA = newIatBaseAddress;
DWORD patchBytes = 0;
for (std::vector<IATReference>::iterator iter = iatReferenceList.begin(); iter != iatReferenceList.end(); iter++)
{
IATReference * ref = &(*iter);
DWORD_PTR newIatAddressPointer = (ref->targetPointer - IatAddressVA) + NewIatAddressRVA + stdImagebase;
#ifdef _WIN64
patchBytes = (DWORD)(newIatAddressPointer - (ref->addressVA - ImageBase + stdImagebase) - 6);
#else
patchBytes = newIatAddressPointer;
#endif
DWORD_PTR patchOffset = peParser->convertRVAToOffsetRelative(ref->addressVA - ImageBase);
int index = peParser->convertRVAToOffsetVectorIndex(ref->addressVA - ImageBase);
BYTE * memory = peParser->getSectionMemoryByIndex(index);
DWORD memorySize = peParser->getSectionMemorySizeByIndex(index);
if (memorySize < (DWORD)(patchOffset + 6))
{
Scylla::debugLog.log(L"Error - Cannot fix IAT reference RVA: " PRINTF_DWORD_PTR_FULL, ref->addressVA - ImageBase);
}
else
{
memory += patchOffset + 2;
*((DWORD *)memory) = patchBytes;
}
//Scylla::debugLog.log(L"address %X old %X new %X",ref->addressVA, ref->targetPointer, newIatAddressPointer);
}
}
void IATReferenceScan::printDirectImportLog()
{
IATReferenceScan::directImportLog.log(L"------------------------------------------------------------");
IATReferenceScan::directImportLog.log(L"ImageBase " PRINTF_DWORD_PTR_FULL L" ImageSize %08X IATAddress " PRINTF_DWORD_PTR_FULL L" IATSize 0x%X", ImageBase, ImageSize, IatAddressVA, IatSize);
int count = 0;
bool isSuspect = false;
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
IATReference * ref = &(*iter);
ApiInfo * apiInfo = apiReader->getApiByVirtualAddress(ref->targetAddressInIat, &isSuspect);
count++;
WCHAR * type = L"U";
if (ref->type == IAT_REFERENCE_DIRECT_CALL)
{
type = L"CALL";
}
else if (ref->type == IAT_REFERENCE_DIRECT_JMP)
{
type = L"JMP";
}
else if (ref->type == IAT_REFERENCE_DIRECT_MOV)
{
type = L"MOV";
}
else if (ref->type == IAT_REFERENCE_DIRECT_PUSH)
{
type = L"PUSH";
}
else if (ref->type == IAT_REFERENCE_DIRECT_LEA)
{
type = L"LEA";
}
IATReferenceScan::directImportLog.log(L"%04d AddrVA " PRINTF_DWORD_PTR_FULL L" Type %s Value " PRINTF_DWORD_PTR_FULL L" IatRefPointer " PRINTF_DWORD_PTR_FULL L" Api %s %S", count, ref->addressVA, type, ref->targetAddressInIat, ref->targetPointer,apiInfo->module->getFilename(), apiInfo->name);
}
IATReferenceScan::directImportLog.log(L"------------------------------------------------------------");
}
void IATReferenceScan::findDirectIatReferenceCallJmp( _DInst * instruction )
{
IATReference ref;
if (META_GET_FC(instruction->meta) == FC_CALL || META_GET_FC(instruction->meta) == FC_UNC_BRANCH)
{
if ((instruction->size >= 5) && (instruction->ops[0].type == O_PC)) //CALL/JMP 0x00000000
{
if (META_GET_FC(instruction->meta) == FC_CALL)
{
ref.type = IAT_REFERENCE_DIRECT_CALL;
}
else
{
ref.type = IAT_REFERENCE_DIRECT_JMP;
}
ref.targetAddressInIat = (DWORD_PTR)INSTRUCTION_GET_TARGET(instruction);
checkMemoryRangeAndAddToList(&ref, instruction);
}
}
}
void IATReferenceScan::findDirectIatReferenceMov( _DInst * instruction )
{
IATReference ref;
ref.type = IAT_REFERENCE_DIRECT_MOV;
if (instruction->opcode == I_MOV)
{
#ifdef _WIN64
if (instruction->size >= 7) //MOV REGISTER, 0xFFFFFFFFFFFFFFFF
#else
if (instruction->size >= 5) //MOV REGISTER, 0xFFFFFFFF
#endif
{
if (instruction->ops[0].type == O_REG && instruction->ops[1].type == O_IMM)
{
ref.targetAddressInIat = (DWORD_PTR)instruction->imm.qword;
checkMemoryRangeAndAddToList(&ref, instruction);
}
}
}
}
void IATReferenceScan::findDirectIatReferencePush( _DInst * instruction )
{
IATReference ref;
ref.type = IAT_REFERENCE_DIRECT_PUSH;
if (instruction->size >= 5 && instruction->opcode == I_PUSH)
{
ref.targetAddressInIat = (DWORD_PTR)instruction->imm.qword;
checkMemoryRangeAndAddToList(&ref, instruction);
}
}
void IATReferenceScan::findDirectIatReferenceLea( _DInst * instruction )
{
IATReference ref;
ref.type = IAT_REFERENCE_DIRECT_LEA;
if (instruction->size >= 5 && instruction->opcode == I_LEA)
{
if (instruction->ops[0].type == O_REG && instruction->ops[1].type == O_DISP) //LEA EDX, [0xb58bb8]
{
ref.targetAddressInIat = (DWORD_PTR)instruction->disp;
checkMemoryRangeAndAddToList(&ref, instruction);
}
}
}
void IATReferenceScan::checkMemoryRangeAndAddToList( IATReference * ref, _DInst * instruction )
{
#ifdef DEBUG_COMMENTS
_DecodedInst inst;
#endif
if (ref->targetAddressInIat > 0x000FFFFF && ref->targetAddressInIat != (DWORD_PTR)-1)
{
if ((ref->targetAddressInIat < ImageBase) || (ref->targetAddressInIat > (ImageBase+ImageSize))) //outside pe image
{
//if (isAddressValidImageMemory(ref->targetAddressInIat))
{
bool isSuspect = false;
if (apiReader->getApiByVirtualAddress(ref->targetAddressInIat, &isSuspect) != 0)
{
ref->addressVA = (DWORD_PTR)instruction->addr;
ref->instructionSize = instruction->size;
ref->targetPointer = lookUpIatForPointer(ref->targetAddressInIat);
#ifdef DEBUG_COMMENTS
distorm_format(&ProcessAccessHelp::decomposerCi, instruction, &inst);
Scylla::debugLog.log(PRINTF_DWORD_PTR_FULL L" " PRINTF_DWORD_PTR_FULL L" %S %S %d %d - target address: " PRINTF_DWORD_PTR_FULL,(DWORD_PTR)instruction->addr, ImageBase, inst.mnemonic.p, inst.operands.p, instruction->ops[0].type, instruction->size, ref->targetAddressInIat);
#endif
iatDirectImportList.push_back(*ref);
}
}
}
}
}
void IATReferenceScan::patchDirectJumpTableEntry(DWORD_PTR targetIatPointer, DWORD_PTR stdImagebase, DWORD directImportsJumpTableRVA, PeParser * peParser, BYTE * jmpTableMemory, DWORD newIatBase )
{
DWORD patchBytes = 0;
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
IATReference * ref = &(*iter);
//only one jmp in table for different direct imports with same iat address
if (ref->targetPointer == targetIatPointer)
{
//patch dump
- DWORD_PTR patchOffset = peParser->convertRVAToOffsetRelative(ref->addressVA - ImageBase);
+ DWORD patchOffset = (DWORD)peParser->convertRVAToOffsetRelative(ref->addressVA - ImageBase);
int index = peParser->convertRVAToOffsetVectorIndex(ref->addressVA - ImageBase);
BYTE * memory = peParser->getSectionMemoryByIndex(index);
DWORD memorySize = peParser->getSectionMemorySizeByIndex(index);
DWORD sectionRVA = peParser->getSectionAddressRVAByIndex(index);
if (ref->type == IAT_REFERENCE_DIRECT_CALL || ref->type == IAT_REFERENCE_DIRECT_JMP)
{
+#ifndef _WIN64
if (ref->instructionSize == 5)
{
patchBytes = directImportsJumpTableRVA - (ref->addressVA - ImageBase) - 5;
patchDirectImportInDump32(1, 5, patchBytes, memory, memorySize, false, patchOffset, sectionRVA);
}
+#endif
}
else if (ref->type == IAT_REFERENCE_DIRECT_PUSH || ref->type == IAT_REFERENCE_DIRECT_MOV)
{
+#ifndef _WIN64
if (ref->instructionSize == 5) //for x86
{
patchBytes = directImportsJumpTableRVA + stdImagebase;
patchDirectImportInDump32(1, 5, patchBytes, memory, memorySize, true, patchOffset, sectionRVA);
}
-
- if (ref->instructionSize > 5) //for x64
+#else
+ if (ref->instructionSize == 10) //for x64
{
DWORD_PTR patchBytes64 = directImportsJumpTableRVA + stdImagebase;
- patchDirectImportInDump32(1, ref->instructionSize, patchBytes64, memory, memorySize, true, patchOffset, sectionRVA);
+ patchDirectImportInDump64(2, 10, patchBytes64, memory, memorySize, true, patchOffset, sectionRVA);
}
+#endif
}
else if (ref->type == IAT_REFERENCE_DIRECT_LEA)
{
+#ifndef _WIN64
if (ref->instructionSize == 6)
{
patchBytes = directImportsJumpTableRVA + stdImagebase;
patchDirectImportInDump32(2, 6, patchBytes, memory, memorySize, true, patchOffset, sectionRVA);
}
+#endif
}
}
}
}
void IATReferenceScan::patchDirectJumpTable( DWORD_PTR stdImagebase, DWORD directImportsJumpTableRVA, PeParser * peParser, BYTE * jmpTableMemory, DWORD newIatBase )
{
std::set<DWORD_PTR> apiPointers;
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
IATReference * ref = &(*iter);
apiPointers.insert(ref->targetPointer);
}
DWORD patchBytes;
for (std::set<DWORD_PTR>::iterator apiIter = apiPointers.begin(); apiIter != apiPointers.end(); apiIter++)
{
DWORD_PTR refTargetPointer = *apiIter;
if (newIatBase) //create new iat in section
{
refTargetPointer = (*apiIter - IatAddressVA) + newIatBase + ImageBase;
}
//create jump table in section
DWORD_PTR newIatAddressPointer = refTargetPointer - ImageBase + stdImagebase;
#ifdef _WIN64
patchBytes = (DWORD)(newIatAddressPointer - (directImportsJumpTableRVA + stdImagebase) - 6);
#else
patchBytes = newIatAddressPointer; //dont forget relocation here
directImportLog.log(L"Relocation direct imports fix: Base RVA %08X Offset %04X Type IMAGE_REL_BASED_HIGHLOW", (directImportsJumpTableRVA + 2) & 0xFFFFF000, (directImportsJumpTableRVA + 2) & 0x00000FFF);
#endif
jmpTableMemory[0] = 0xFF;
jmpTableMemory[1] = 0x25;
*((DWORD *)&jmpTableMemory[2]) = patchBytes;
patchDirectJumpTableEntry(*apiIter, stdImagebase, directImportsJumpTableRVA, peParser, jmpTableMemory, newIatBase);
jmpTableMemory += 6;
directImportsJumpTableRVA += 6;
}
}
void IATReferenceScan::patchDirectImportInDump32( int patchPreFixBytes, int instructionSize, DWORD patchBytes, BYTE * memory, DWORD memorySize, bool generateReloc, DWORD patchOffset, DWORD sectionRVA )
{
if (memorySize < (DWORD)(patchOffset + instructionSize))
{
Scylla::debugLog.log(L"Error - Cannot fix direct import reference RVA: %X", sectionRVA + patchOffset);
}
else
{
memory += patchOffset + patchPreFixBytes;
if (generateReloc)
{
directImportLog.log(L"Relocation direct imports fix: Base RVA %08X Offset %04X Type IMAGE_REL_BASED_HIGHLOW", (sectionRVA + patchOffset + patchPreFixBytes) & 0xFFFFF000, (sectionRVA + patchOffset+ patchPreFixBytes) & 0x00000FFF);
}
*((DWORD *)memory) = patchBytes;
}
}
+void IATReferenceScan::patchDirectImportInDump64( int patchPreFixBytes, int instructionSize, DWORD_PTR patchBytes, BYTE * memory, DWORD memorySize, bool generateReloc, DWORD patchOffset, DWORD sectionRVA )
+{
+ if (memorySize < (DWORD)(patchOffset + instructionSize))
+ {
+ Scylla::debugLog.log(L"Error - Cannot fix direct import reference RVA: %X", sectionRVA + patchOffset);
+ }
+ else
+ {
+ memory += patchOffset + patchPreFixBytes;
+ if (generateReloc)
+ {
+ directImportLog.log(L"Relocation direct imports fix: Base RVA %08X Offset %04X Type IMAGE_REL_BASED_DIR64", (sectionRVA + patchOffset + patchPreFixBytes) & 0xFFFFF000, (sectionRVA + patchOffset+ patchPreFixBytes) & 0x00000FFF);
+ }
+
+ *((DWORD_PTR *)memory) = patchBytes;
+ }
+}
+
DWORD IATReferenceScan::addAdditionalApisToList()
{
std::set<DWORD_PTR> apiPointers;
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
IATReference * ref = &(*iter);
if (ref->targetPointer == 0)
{
apiPointers.insert(ref->targetAddressInIat);
}
}
DWORD_PTR iatAddy = IatAddressVA + IatSize;
DWORD newIatSize = IatSize;
bool isSuspect = false;
for (std::set<DWORD_PTR>::iterator apiIter = apiPointers.begin(); apiIter != apiPointers.end(); apiIter++)
{
for (std::vector<IATReference>::iterator iter = iatDirectImportList.begin(); iter != iatDirectImportList.end(); iter++)
{
IATReference * ref = &(*iter);
if (ref->targetPointer == 0 && ref->targetAddressInIat == *apiIter)
{
ref->targetPointer = iatAddy;
ApiInfo * apiInfo = apiReader->getApiByVirtualAddress(ref->targetAddressInIat, &isSuspect);
apiReader->addFoundApiToModuleList(iatAddy, apiInfo, true, isSuspect);
}
}
iatAddy += sizeof(DWORD_PTR);
newIatSize += sizeof(DWORD_PTR);
}
return newIatSize;
}
diff --git a/Scylla/IATReferenceScan.h b/Scylla/IATReferenceScan.h
index 37b2488..068f742 100644
--- a/Scylla/IATReferenceScan.h
+++ b/Scylla/IATReferenceScan.h
@@ -1,126 +1,127 @@
#pragma once
#include <vector>
#include "ProcessAccessHelp.h"
#include "PeParser.h"
#include "Logger.h"
#include "ApiReader.h"
enum IATReferenceType {
IAT_REFERENCE_PTR_JMP,
IAT_REFERENCE_PTR_CALL,
IAT_REFERENCE_DIRECT_JMP,
IAT_REFERENCE_DIRECT_CALL,
IAT_REFERENCE_DIRECT_MOV,
IAT_REFERENCE_DIRECT_PUSH,
IAT_REFERENCE_DIRECT_LEA
};
class IATReference
{
public:
DWORD_PTR addressVA; //Address of reference
DWORD_PTR targetPointer; //Place inside IAT
DWORD_PTR targetAddressInIat; //WIN API?
BYTE instructionSize;
IATReferenceType type;
};
class IATReferenceScan
{
public:
IATReferenceScan()
{
apiReader = 0;
IatAddressVA = 0;
IatSize = 0;
ImageBase = 0;
ImageSize = 0;
iatBackup = 0;
ScanForDirectImports = false;
ScanForNormalImports = true;
}
~IATReferenceScan()
{
iatReferenceList.clear();
iatDirectImportList.clear();
if (iatBackup)
{
free(iatBackup);
}
}
bool ScanForDirectImports;
bool ScanForNormalImports;
bool JunkByteAfterInstruction;
ApiReader * apiReader;
void startScan(DWORD_PTR imageBase, DWORD imageSize, DWORD_PTR iatAddress, DWORD iatSize);
//void patchNewIatBaseMemory(DWORD_PTR newIatBaseAddress);
//void patchNewIatBaseFile(DWORD_PTR newIatBaseAddress);
void patchNewIat(DWORD_PTR stdImagebase, DWORD_PTR newIatBaseAddress, PeParser * peParser);
void patchDirectJumpTable( DWORD_PTR imageBase, DWORD directImportsJumpTableRVA, PeParser * peParser, BYTE * jmpTableMemory, DWORD newIatBase);
void patchDirectImportsMemory(bool junkByteAfterInstruction);
int numberOfFoundDirectImports();
int numberOfFoundUniqueDirectImports();
int numberOfDirectImportApisNotInIat();
int getSizeInBytesOfJumpTableInSection();
static FileLog directImportLog;
void printDirectImportLog();
void changeIatBaseOfDirectImports( DWORD newIatBaseAddressRVA );
DWORD addAdditionalApisToList();
private:
DWORD_PTR NewIatAddressRVA;
DWORD_PTR IatAddressVA;
DWORD IatSize;
DWORD_PTR ImageBase;
DWORD ImageSize;
DWORD_PTR * iatBackup;
std::vector<IATReference> iatReferenceList;
std::vector<IATReference> iatDirectImportList;
bool isPageExecutable( DWORD Protect );
void scanMemoryPage( PVOID BaseAddress, SIZE_T RegionSize );
void analyzeInstruction( _DInst * instruction );
void findNormalIatReference( _DInst * instruction );
void getIatEntryAddress( IATReference* ref );
void findDirectIatReferenceCallJmp( _DInst * instruction );
bool isAddressValidImageMemory( DWORD_PTR address );
void patchReferenceInMemory( IATReference * ref );
void patchReferenceInFile( IATReference* ref );
void patchDirectImportInMemory( IATReference * iter );
DWORD_PTR lookUpIatForPointer( DWORD_PTR addr );
void findDirectIatReferenceMov( _DInst * instruction );
void findDirectIatReferencePush( _DInst * instruction );
void checkMemoryRangeAndAddToList( IATReference * ref, _DInst * instruction );
void findDirectIatReferenceLea( _DInst * instruction );
void patchDirectImportInDump32( int patchPreFixBytes, int instructionSize, DWORD patchBytes, BYTE * memory, DWORD memorySize, bool generateReloc, DWORD patchOffset, DWORD sectionRVA );
+ void patchDirectImportInDump64( int patchPreFixBytes, int instructionSize, DWORD_PTR patchBytes, BYTE * memory, DWORD memorySize, bool generateReloc, DWORD patchOffset, DWORD sectionRVA );
void patchDirectJumpTableEntry(DWORD_PTR targetIatPointer, DWORD_PTR stdImagebase, DWORD directImportsJumpTableRVA, PeParser * peParser, BYTE * jmpTableMemory, DWORD newIatBase );
};
/*
PE64
----------
000000013FF82D87 FF15 137C0A00 CALL QWORD [RIP+0xA7C13]
Result: 000000014002A9A0
000000013F65C952 FF25 F8EA0B00 JMP QWORD [RIP+0xBEAF8]
Result: 000000013F71B450
PE32
----------
0120FFA5 FF15 8C6D2601 CALL DWORD [0x01266D8C]
0120FF52 FF25 D4722601 JMP DWORD [0x012672D4]
*/
File Metadata
Details
Attached
Mime Type
text/x-diff
Expires
Sat, Jul 5, 11:47 AM (14 h, 48 m)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
c6/2d/dbb29f28ea7a58f3ec09b2d85cc9
Attached To
rSCY Scylla
Event Timeline
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