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feat: Enable "Ignore Remove Original Code After Obfuscation"

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Users can now enable an option in the obfuscation config to "ignore the removal of the original code" after obfuscation.
This commit is contained in:
keowu
2025-06-04 20:55:23 -03:00
parent a02c72a5e5
commit 5b004bff54
4 changed files with 6 additions and 10 deletions
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5
RyujinConsole/RyujinConsole/Ryujin/Ryujin.cc
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@@ -149,9 +149,6 @@ bool Ryujin::run(const RyujinObfuscatorConfig& config) {
}
//Remove old code and jump to the new code region
if (config.m_isIgnoreOriginalCodeRemove) todoAction();
//Add section
char chSectionName[8]{ '.', 'R', 'y', 'u', 'j', 'i', 'n', '\0' };
if (config.m_isRandomSection) RyujinUtils::randomizeSectionName(chSectionName);
@@ -169,7 +166,7 @@ bool Ryujin::run(const RyujinObfuscatorConfig& config) {
obc.applyRelocationFixupsToInstructions(reinterpret_cast<uintptr_t>(imgDos), peSections.getRyujinSectionVA() + offsetVA, tempValued);
//Removendo e adicionando um salto no procedimento original e removendo opcodes originais para um salto ao novo c<>digo ofuscado
obc.removeOldOpcodeRedirect(peSections.mappedPeDiskBaseAddress(), peSections.getRyujinMappedPeSize(), reinterpret_cast<uintptr_t>(imgDos) + peSections.getRyujinSectionVA() + offsetVA);
obc.removeOldOpcodeRedirect(peSections.mappedPeDiskBaseAddress(), peSections.getRyujinMappedPeSize(), reinterpret_cast<uintptr_t>(imgDos) + peSections.getRyujinSectionVA() + offsetVA, config.m_isIgnoreOriginalCodeRemove);
//Destructing class
obc.~RyujinObfuscationCore();

8
RyujinConsole/RyujinConsole/Ryujin/RyujinCore/RyujinObfuscationCore.cc
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@@ -437,7 +437,7 @@ void RyujinObfuscationCore::applyRelocationFixupsToInstructions(uintptr_t imageB
}
void RyujinObfuscationCore::removeOldOpcodeRedirect(uintptr_t newMappedPE, std::size_t szMapped, uintptr_t newObfuscatedAddress) {
void RyujinObfuscationCore::removeOldOpcodeRedirect(uintptr_t newMappedPE, std::size_t szMapped, uintptr_t newObfuscatedAddress, bool isIgnoreOriginalCodeRemove) {
/*
Creating signatures to search for the opcode in the PE mapped from disk.
@@ -448,10 +448,8 @@ void RyujinObfuscationCore::removeOldOpcodeRedirect(uintptr_t newMappedPE, std::
std::memcpy(ucSigature, reinterpret_cast<void*>(m_proc.address), 10);
auto offsetz = findOpcodeOffset(reinterpret_cast<unsigned char*>(newMappedPE), szMapped, &ucSigature, 10);
/*
Removing all the opcodes from the original procedure and replacing them with NOP instructions.
*/
std::memset(reinterpret_cast<void*>(newMappedPE + offsetz), 0x90, m_proc.size);
// Based on the obfuscation configuration, some users can decide to not remove the original code from the original procedure after obfuscation.
if (!isIgnoreOriginalCodeRemove) std::memset(reinterpret_cast<void*>(newMappedPE + offsetz), 0x90, m_proc.size); // Removing all the opcodes from the original procedure and replacing them with NOP instructions.
/*
Creating a new JMP opcode in such a way that it can be added to the old region that was completely replaced by NOP,

2
RyujinConsole/RyujinConsole/Ryujin/RyujinCore/RyujinObfuscationCore.hh
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@@ -26,7 +26,7 @@ private:
public:
RyujinObfuscationCore(const RyujinObfuscatorConfig& config, const RyujinProcedure& proc);
void applyRelocationFixupsToInstructions(uintptr_t imageBase, DWORD virtualAddress, std::vector<unsigned char>& new_opcodes);
void removeOldOpcodeRedirect(uintptr_t newMappedPE, std::size_t szMapped, uintptr_t newObfuscatedAddress);
void removeOldOpcodeRedirect(uintptr_t newMappedPE, std::size_t szMapped, uintptr_t newObfuscatedAddress, bool isIgnoreOriginalCodeRemove = false);
BOOL Run();
RyujinProcedure getProcessedProc();
~RyujinObfuscationCore();

1
RyujinConsole/RyujinConsole/RyujinConsole.cc
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@@ -14,6 +14,7 @@ auto main() -> int {
config.m_isJunkCode = TRUE;
config.m_isRandomSection = FALSE;
config.m_isVirtualized = FALSE;
config.m_isIatObfuscation = TRUE;
std::vector<std::string> procsToObfuscate{
"main",
"mainCRTStartup",