public override bool GetDecryptedModule(int count, ref byte[] newFileData, ref DumpedMethods dumpedMethods) {
if (count != 0 || version == Version.Unknown)
return false;
byte[] fileData = ModuleBytes ?? DeobUtils.ReadModule(module);
byte[] decompressed;
using (var peImage = new MyPEImage(fileData)) {
var section = peImage.Sections[peImage.Sections.Count - 1];
var offset = section.PointerToRawData;
offset += 16;
byte[] compressed;
int compressedLen;
switch (version) {
case Version.V0x:
compressedLen = fileData.Length - (int)offset;
compressed = peImage.OffsetReadBytes(offset, compressedLen);
decompressed = Lzmat.DecompressOld(compressed);
if (decompressed == null)
throw new ApplicationException("LZMAT decompression failed");
break;
case Version.V1x_217:
case Version.V218:
if (peImage.PEImage.ImageNTHeaders.FileHeader.Machine == Machine.AMD64 && version == Version.V218)
offset = section.PointerToRawData + section.VirtualSize;
int decompressedLen = (int)peImage.OffsetReadUInt32(offset);
compressedLen = fileData.Length - (int)offset - 4;
compressed = peImage.OffsetReadBytes(offset + 4, compressedLen);
decompressed = new byte[decompressedLen];
uint decompressedLen2;
if (Lzmat.Decompress(decompressed, out decompressedLen2, compressed) != LzmatStatus.OK)
throw new ApplicationException("LZMAT decompression failed");
break;
default:
throw new ApplicationException("Unknown MPRESS version");
}
}
newFileData = decompressed;
return true;
}
byte[] Unpack2(MyPEImage peImage) {
shouldUnpack = false;
uint headerOffset = (uint)peImage.Length - 12;
uint offsetEncryptedAssembly = CheckOffset(peImage, peImage.OffsetReadUInt32(headerOffset));
uint ezencryptionLibLength = peImage.OffsetReadUInt32(headerOffset + 4);
uint iniFileLength = peImage.OffsetReadUInt32(headerOffset + 8);
uint offsetClrVersionNumber = checked(offsetEncryptedAssembly - 12);
uint iniFileOffset = checked(headerOffset - iniFileLength);
uint ezencryptionLibOffset = checked(iniFileOffset - ezencryptionLibLength);
uint clrVerMajor = peImage.OffsetReadUInt32(offsetClrVersionNumber);
uint clrVerMinor = peImage.OffsetReadUInt32(offsetClrVersionNumber + 4);
uint clrVerBuild = peImage.OffsetReadUInt32(offsetClrVersionNumber + 8);
if (clrVerMajor <= 0 || clrVerMajor >= 20 || clrVerMinor >= 20 || clrVerBuild >= 1000000)
return null;
var settings = new IniFile(Decompress2(peImage.OffsetReadBytes(iniFileOffset, (int)iniFileLength)));
sizes = GetSizes(settings["General_App_Satellite_Assemblies_Sizes"]);
if (sizes == null || sizes.Length <= 1)
return null;
shouldUnpack = true;
if (sizes[0] != offsetEncryptedAssembly)
return null;
filenames = settings["General_App_Satellite_Assemblies"].Split('|');
if (sizes.Length - 1 != filenames.Length)
return null;
byte[] ezencryptionLibData = Decompress1(peImage.OffsetReadBytes(ezencryptionLibOffset, (int)ezencryptionLibLength));
var ezencryptionLibModule = ModuleDefMD.Load(ezencryptionLibData);
var decrypter = new ApplicationModeDecrypter(ezencryptionLibModule);
if (!decrypter.Detected)
return null;
var mainAssembly = UnpackEmbeddedFile(peImage, 0, decrypter);
decrypter.MemoryPatcher.Patch(mainAssembly.data);
for (int i = 1; i < filenames.Length; i++)
satelliteAssemblies.Add(UnpackEmbeddedFile(peImage, i, decrypter));
ClearDllBit(mainAssembly.data);
return mainAssembly.data;
}
DumpedMethods CreateDumpedMethods(MyPEImage peImage, byte[] fileData, byte[] methodsData) {
var dumpedMethods = new DumpedMethods();
var methodsDataReader = MemoryImageStream.Create(methodsData);
var fileDataReader = MemoryImageStream.Create(fileData);
var methodDef = peImage.MetaData.TablesStream.MethodTable;
for (uint rid = 1; rid <= methodDef.Rows; rid++) {
var dm = new DumpedMethod();
peImage.ReadMethodTableRowTo(dm, rid);
if (dm.mdRVA == 0)
continue;
uint bodyOffset = peImage.RvaToOffset(dm.mdRVA);
byte b = peImage.OffsetReadByte(bodyOffset);
uint codeOffset;
if ((b & 3) == 2) {
if (b != 2)
continue; // not zero byte code size
dm.mhFlags = 2;
dm.mhMaxStack = 8;
dm.mhLocalVarSigTok = 0;
codeOffset = bodyOffset + 1;
}
else {
if (peImage.OffsetReadUInt32(bodyOffset + 4) != 0)
continue; // not zero byte code size
dm.mhFlags = peImage.OffsetReadUInt16(bodyOffset);
dm.mhMaxStack = peImage.OffsetReadUInt16(bodyOffset + 2);
dm.mhLocalVarSigTok = peImage.OffsetReadUInt32(bodyOffset + 8);
codeOffset = bodyOffset + (uint)(dm.mhFlags >> 12) * 4;
}
fileDataReader.Position = codeOffset;
if (!decrypter.Decrypt(fileDataReader, dm))
continue;
dumpedMethods.Add(dm);
}
return dumpedMethods;
}
public bool Decrypt(MyPEImage peImage, ISimpleDeobfuscator simpleDeobfuscator, ref DumpedMethods dumpedMethods, Dictionary<uint, byte[]> tokenToNativeCode, bool unpackedNativeFile) {
if (encryptedResource.Method == null)
return false;
encryptedResource.Initialize(simpleDeobfuscator);
if (!encryptedResource.FoundResource)
return false;
var methodsData = encryptedResource.Decrypt();
bool hooksJitter = FindDnrCompileMethod(encryptedResource.Method.DeclaringType) != null;
xorKey = GetXorKey();
XorEncrypt(methodsData);
var methodsDataReader = MemoryImageStream.Create(methodsData);
int patchCount = methodsDataReader.ReadInt32();
int mode = methodsDataReader.ReadInt32();
int tmp = methodsDataReader.ReadInt32();
methodsDataReader.Position -= 4;
if ((tmp & 0xFF000000) == 0x06000000) {
// It's method token + rva. DNR 3.7.0.3 (and earlier?) - 3.9.0.1
methodsDataReader.Position += 8L * patchCount;
patchCount = methodsDataReader.ReadInt32();
mode = methodsDataReader.ReadInt32();
PatchDwords(peImage, methodsDataReader, patchCount);
while (methodsDataReader.Position < methodsData.Length - 1) {
uint token = methodsDataReader.ReadUInt32();
int numDwords = methodsDataReader.ReadInt32();
PatchDwords(peImage, methodsDataReader, numDwords / 2);
}
}
else if (!hooksJitter || mode == 1) {
// DNR 3.9.8.0, 4.0+
PatchDwords(peImage, methodsDataReader, patchCount);
bool oldCode = !IsNewer45Decryption(encryptedResource.Method);
while (methodsDataReader.Position < methodsData.Length - 1) {
uint rva = methodsDataReader.ReadUInt32();
int size;
if (oldCode) {
methodsDataReader.ReadUInt32(); // token, unknown, or index
size = methodsDataReader.ReadInt32();
}
else
size = methodsDataReader.ReadInt32() * 4;
var newData = methodsDataReader.ReadBytes(size);
if (unpackedNativeFile)
peImage.DotNetSafeWriteOffset(rva, newData);
else
peImage.DotNetSafeWrite(rva, newData);
}
}
else {
// DNR 4.0+ (jitter is hooked)
var methodDef = peImage.MetaData.TablesStream.MethodTable;
var rvaToIndex = new Dictionary<uint, int>((int)methodDef.Rows);
uint offset = (uint)methodDef.StartOffset;
for (int i = 0; i < methodDef.Rows; i++) {
uint rva = peImage.OffsetReadUInt32(offset);
offset += methodDef.RowSize;
if (rva == 0)
continue;
if ((peImage.ReadByte(rva) & 3) == 2)
rva++;
else
rva += (uint)(4 * (peImage.ReadByte(rva + 1) >> 4));
rvaToIndex[rva] = i;
}
PatchDwords(peImage, methodsDataReader, patchCount);
int count = methodsDataReader.ReadInt32();
dumpedMethods = new DumpedMethods();
while (methodsDataReader.Position < methodsData.Length - 1) {
uint rva = methodsDataReader.ReadUInt32();
uint index = methodsDataReader.ReadUInt32();
bool isNativeCode = index >= 0x70000000;
int size = methodsDataReader.ReadInt32();
var methodData = methodsDataReader.ReadBytes(size);
int methodIndex;
if (!rvaToIndex.TryGetValue(rva, out methodIndex)) {
Logger.w("Could not find method having code RVA {0:X8}", rva);
continue;
}
uint methodToken = 0x06000001 + (uint)methodIndex;
if (isNativeCode) {
totalEncryptedNativeMethods++;
if (tokenToNativeCode != null)
tokenToNativeCode[methodToken] = methodData;
// Convert return true / false methods. The others are converted to
// throw 0xDEADCODE.
if (DeobUtils.IsCode(nativeLdci4, methodData)) {
uint val = BitConverter.ToUInt32(methodData, 4);
// ldc.i4 XXXXXXXXh / ret
methodData = new byte[] { 0x20, 0, 0, 0, 0, 0x2A };
methodData[1] = (byte)val;
methodData[2] = (byte)(val >> 8);
methodData[3] = (byte)(val >> 16);
methodData[4] = (byte)(val >> 24);
}
else if (DeobUtils.IsCode(nativeLdci4_0, methodData)) {
// ldc.i4.0 / ret
methodData = new byte[] { 0x16, 0x2A };
}
else {
tokenToNativeMethod[methodToken] = methodData;
// ldc.i4 0xDEADCODE / conv.u4 / throw
methodData = new byte[] { 0x20, 0xDE, 0xC0, 0xAD, 0xDE, 0x6D, 0x7A };
}
}
var dm = new DumpedMethod();
peImage.ReadMethodTableRowTo(dm, MDToken.ToRID(methodToken));
dm.code = methodData;
var codeReader = peImage.Reader;
codeReader.Position = peImage.RvaToOffset(dm.mdRVA);
byte[] code;
var mbHeader = MethodBodyParser.ParseMethodBody(codeReader, out code, out dm.extraSections);
peImage.UpdateMethodHeaderInfo(dm, mbHeader);
dumpedMethods.Add(dm);
}
}
return true;
}
uint ReadUInt32(uint offset) => peImage.OffsetReadUInt32(methodInfosOffset + offset);
List <CsHeaderVersion> GetCsHeaderVersions(uint codeHeaderOffset, MDTable methodDefTable)
{
if (sigType == SigType.Old)
{
return new List <CsHeaderVersion> {
CsHeaderVersion.V10
}
}
;
if (!IsOldHeader(methodDefTable))
{
return new List <CsHeaderVersion> {
CsHeaderVersion.V52
}
}
;
if (csRtType.IsAtLeastVersion50())
{
return new List <CsHeaderVersion> {
CsHeaderVersion.V50
}
}
;
if (IsCsHeader40(codeHeaderOffset))
{
return(new List <CsHeaderVersion> {
CsHeaderVersion.V40,
CsHeaderVersion.V30,
});
}
return(new List <CsHeaderVersion> {
CsHeaderVersion.V45,
CsHeaderVersion.V50,
});
}
bool IsCsHeader40(uint codeHeaderOffset)
{
try {
uint offset = codeHeaderOffset + codeHeader.totalCodeSize + 0x28;
uint prevCodeOffs = 0;
for (int i = 0; i < (int)codeHeader.numMethods; i++, offset += 4)
{
uint codeOffs = peImage.OffsetReadUInt32(offset);
if (prevCodeOffs != 0 && codeOffs != 0 && codeOffs < prevCodeOffs)
{
return(false);
}
if (codeOffs != 0)
{
prevCodeOffs = codeOffs;
}
}
return(true);
}
catch (IOException) {
return(false);
}
}
bool IsOldHeader(MDTable methodDefTable)
{
if (methodDefTable.RowSize != codeHeader.methodDefElemSize)
{
return(true);
}
if ((uint)methodDefTable.StartOffset - peImage.RvaToOffset((uint)peImage.Cor20Header.MetaData.VirtualAddress) != codeHeader.methodDefTableOffset)
{
return(true);
}
return(false);
}
ICsHeader CreateCsHeader(CsHeaderVersion version)
{
switch (version)
{
case CsHeaderVersion.V30: return(new CsHeader30(this));
case CsHeaderVersion.V40: return(new CsHeader40(this));
case CsHeaderVersion.V45: return(new CsHeader45(this));
case CsHeaderVersion.V50: return(new CsHeader5(this, 0x28));
case CsHeaderVersion.V52: return(new CsHeader5(this, 0x30));
default: throw new ApplicationException("Unknown CS header");
}
}
public bool Decrypt(MyPEImage peImage, ISimpleDeobfuscator simpleDeobfuscator, ref DumpedMethods dumpedMethods, Dictionary <uint, byte[]> tokenToNativeCode, bool unpackedNativeFile)
{
if (encryptedResource.Method == null)
{
return(false);
}
encryptedResource.Initialize(simpleDeobfuscator);
if (!encryptedResource.FoundResource)
{
return(false);
}
var methodsData = encryptedResource.Decrypt();
bool hooksJitter = FindDnrCompileMethod(encryptedResource.Method.DeclaringType) != null;
xorKey = GetXorKey();
XorEncrypt(methodsData);
var methodsDataReader = MemoryImageStream.Create(methodsData);
int patchCount = methodsDataReader.ReadInt32();
int mode = methodsDataReader.ReadInt32();
int tmp = methodsDataReader.ReadInt32();
methodsDataReader.Position -= 4;
if ((tmp & 0xFF000000) == 0x06000000)
{
// It's method token + rva. DNR 3.7.0.3 (and earlier?) - 3.9.0.1
methodsDataReader.Position += 8L * patchCount;
patchCount = methodsDataReader.ReadInt32();
mode = methodsDataReader.ReadInt32();
PatchDwords(peImage, methodsDataReader, patchCount);
while (methodsDataReader.Position < methodsData.Length - 1)
{
uint token = methodsDataReader.ReadUInt32();
int numDwords = methodsDataReader.ReadInt32();
PatchDwords(peImage, methodsDataReader, numDwords / 2);
}
}
else if (!hooksJitter || mode == 1)
{
// DNR 3.9.8.0, 4.0+
PatchDwords(peImage, methodsDataReader, patchCount);
bool oldCode = !IsNewer45Decryption(encryptedResource.Method);
while (methodsDataReader.Position < methodsData.Length - 1)
{
uint rva = methodsDataReader.ReadUInt32();
int size;
if (oldCode)
{
methodsDataReader.ReadUInt32(); // token, unknown, or index
size = methodsDataReader.ReadInt32();
}
else
{
size = methodsDataReader.ReadInt32() * 4;
}
var newData = methodsDataReader.ReadBytes(size);
if (unpackedNativeFile)
{
peImage.DotNetSafeWriteOffset(rva, newData);
}
else
{
peImage.DotNetSafeWrite(rva, newData);
}
}
}
else
{
// DNR 4.0+ (jitter is hooked)
var methodDef = peImage.MetaData.TablesStream.MethodTable;
var rvaToIndex = new Dictionary <uint, int>((int)methodDef.Rows);
uint offset = (uint)methodDef.StartOffset;
for (int i = 0; i < methodDef.Rows; i++)
{
uint rva = peImage.OffsetReadUInt32(offset);
offset += methodDef.RowSize;
if (rva == 0)
{
continue;
}
if ((peImage.ReadByte(rva) & 3) == 2)
{
rva++;
}
else
{
rva += (uint)(4 * (peImage.ReadByte(rva + 1) >> 4));
}
rvaToIndex[rva] = i;
}
PatchDwords(peImage, methodsDataReader, patchCount);
int count = methodsDataReader.ReadInt32();
dumpedMethods = new DumpedMethods();
while (methodsDataReader.Position < methodsData.Length - 1)
{
uint rva = methodsDataReader.ReadUInt32();
uint index = methodsDataReader.ReadUInt32();
bool isNativeCode = index >= 0x70000000;
int size = methodsDataReader.ReadInt32();
var methodData = methodsDataReader.ReadBytes(size);
int methodIndex;
if (!rvaToIndex.TryGetValue(rva, out methodIndex))
{
Logger.w("Could not find method having code RVA {0:X8}", rva);
continue;
}
uint methodToken = 0x06000001 + (uint)methodIndex;
if (isNativeCode)
{
totalEncryptedNativeMethods++;
if (tokenToNativeCode != null)
{
tokenToNativeCode[methodToken] = methodData;
}
// Convert return true / false methods. The others are converted to
// throw 0xDEADCODE.
if (DeobUtils.IsCode(nativeLdci4, methodData))
{
uint val = BitConverter.ToUInt32(methodData, 4);
// ldc.i4 XXXXXXXXh / ret
methodData = new byte[] { 0x20, 0, 0, 0, 0, 0x2A };
methodData[1] = (byte)val;
methodData[2] = (byte)(val >> 8);
methodData[3] = (byte)(val >> 16);
methodData[4] = (byte)(val >> 24);
}
else if (DeobUtils.IsCode(nativeLdci4_0, methodData))
{
// ldc.i4.0 / ret
methodData = new byte[] { 0x16, 0x2A };
}
else
{
tokenToNativeMethod[methodToken] = methodData;
// ldc.i4 0xDEADCODE / conv.u4 / throw
methodData = new byte[] { 0x20, 0xDE, 0xC0, 0xAD, 0xDE, 0x6D, 0x7A };
}
}
var dm = new DumpedMethod();
peImage.ReadMethodTableRowTo(dm, MDToken.ToRID(methodToken));
dm.code = methodData;
var codeReader = peImage.Reader;
codeReader.Position = peImage.RvaToOffset(dm.mdRVA);
byte[] code;
var mbHeader = MethodBodyParser.ParseMethodBody(codeReader, out code, out dm.extraSections);
peImage.UpdateMethodHeaderInfo(dm, mbHeader);
dumpedMethods.Add(dm);
}
}
return(true);
}
uint ReadUInt32(uint offset)
{
return(peImage.OffsetReadUInt32(methodInfosOffset + offset));
}
static EncryptionVersion GetVersion(MyPEImage peImage, uint headerOffset) {
uint m1lo = peImage.OffsetReadUInt32(headerOffset + 0x900);
uint m1hi = peImage.OffsetReadUInt32(headerOffset + 0x904);
foreach (var info in EncryptionInfos.Rva900h) {
if (info.MagicLo == m1lo && info.MagicHi == m1hi)
return info.Version;
}
return EncryptionVersion.Unknown;
}