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Support ILProtector 1.0.6.0 - 1.0.6.7

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This commit is contained in:
de4dot 2012-12-13 12:03:25 +01:00
parent 1dd572f2ef
commit 7e9e691ef3
2 changed files with 231 additions and 99 deletions
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32
de4dot.code/deobfuscators/ILProtector/Deobfuscator.cs
View File

@ -86,30 +86,30 @@ namespace de4dot.code.deobfuscators.ILProtector {
mainType = new MainType(module);
mainType.find();
methodsDecrypter = new MethodsDecrypter(module, mainType);
methodsDecrypter.find();
if (mainType.Detected)
methodsDecrypter.find();
if (mainType.Detected && methodsDecrypter.Detected && methodsDecrypter.Version != null)
obfuscatorName += " " + getVersion(methodsDecrypter.Version);
}
static string getVersion(Version version) {
if (version.Revision == 0)
return string.Format("{0}.{1}.{2}", version.Major, version.Minor, version.Build);
return version.ToString();
obfuscatorName += " " + methodsDecrypter.Version;
}
public override void deobfuscateBegin() {
base.deobfuscateBegin();
methodsDecrypter.decrypt();
addTypesToBeRemoved(methodsDecrypter.DelegateTypes, "Obfuscator method delegate type");
addResourceToBeRemoved(methodsDecrypter.Resource, "Encrypted methods resource");
addTypeToBeRemoved(mainType.InvokerDelegate, "Invoker delegate type");
addFieldToBeRemoved(mainType.InvokerInstanceField, "Invoker delegate instance field");
foreach (var pm in mainType.ProtectMethods) {
addMethodToBeRemoved(pm, "Obfuscator 'Protect' init method");
if (mainType.Detected) {
if (methodsDecrypter.Detected) {
methodsDecrypter.decrypt();
addTypesToBeRemoved(methodsDecrypter.DelegateTypes, "Obfuscator method delegate type");
addResourceToBeRemoved(methodsDecrypter.Resource, "Encrypted methods resource");
addTypeToBeRemoved(mainType.InvokerDelegate, "Invoker delegate type");
addFieldToBeRemoved(mainType.InvokerInstanceField, "Invoker delegate instance field");
foreach (var pm in mainType.ProtectMethods)
addMethodToBeRemoved(pm, "Obfuscator 'Protect' init method");
mainType.cleanUp();
}
else
Logger.w("New ILProtector version. Can't decrypt methods (yet)");
}
mainType.cleanUp();
}
public override IEnumerable<int> getStringDecrypterMethods() {

298
de4dot.code/deobfuscators/ILProtector/MethodsDecrypter.cs
View File

@ -19,6 +19,7 @@
using System;
using System.Collections.Generic;
using System.IO;
using dot10.IO;
using dot10.DotNet;
using dot10.DotNet.Emit;
@ -26,20 +27,210 @@ using de4dot.blocks;
namespace de4dot.code.deobfuscators.ILProtector {
class MethodsDecrypter {
public static readonly byte[] ilpPublicKeyToken = new byte[8] { 0x20, 0x12, 0xD3, 0xC0, 0x55, 0x1F, 0xE0, 0x3D };
// This is the first four bytes of ILProtector's public key token
const uint RESOURCE_MAGIC = 0xC0D31220;
ModuleDefMD module;
MainType mainType;
EmbeddedResource methodsResource;
Version ilpVersion;
Dictionary<int, MethodInfo2> methodInfos = new Dictionary<int, MethodInfo2>();
List<TypeDef> delegateTypes = new List<TypeDef>();
int startOffset;
byte[] decryptionKey;
int decryptionKeyMod;
IDecrypter decrypter;
interface IDecrypter {
string Version { get; }
byte[] getMethodsData(EmbeddedResource resource);
}
class DecrypterBase : IDecrypter {
protected static readonly byte[] ilpPublicKeyToken = new byte[8] { 0x20, 0x12, 0xD3, 0xC0, 0x55, 0x1F, 0xE0, 0x3D };
protected string ilpVersion;
protected int startOffset;
protected byte[] decryptionKey;
protected int decryptionKeyMod;
public string Version {
get { return ilpVersion; }
}
protected void setVersion(Version version) {
if (version.Revision == 0)
ilpVersion = string.Format("{0}.{1}.{2}", version.Major, version.Minor, version.Build);
else
ilpVersion = version.ToString();
}
public virtual byte[] getMethodsData(EmbeddedResource resource) {
var reader = resource.Data;
reader.Position = startOffset;
if ((reader.ReadInt32() & 1) != 0)
return decompress(reader);
else
return reader.ReadRemainingBytes();
}
byte[] decompress(IBinaryReader reader) {
return decompress(reader, decryptionKey, decryptionKeyMod);
}
static void copy(byte[] src, int srcIndex, byte[] dst, int dstIndex, int size) {
for (int i = 0; i < size; i++)
dst[dstIndex++] = src[srcIndex++];
}
static byte[] decompress(IBinaryReader reader, byte[] key, int keyMod) {
return decompress(new byte[reader.Read7BitEncodedUInt32()], reader, key, keyMod);
}
protected static byte[] decompress(byte[] decrypted, IBinaryReader reader, byte[] key, int keyMod) {
int destIndex = 0;
while (reader.Position < reader.Length) {
if (destIndex >= decrypted.Length)
break;
byte flags = reader.ReadByte();
for (int mask = 1; mask != 0x100; mask <<= 1) {
if (reader.Position >= reader.Length)
break;
if (destIndex >= decrypted.Length)
break;
if ((flags & mask) != 0) {
int displ = (int)reader.Read7BitEncodedUInt32();
int size = (int)reader.Read7BitEncodedUInt32();
copy(decrypted, destIndex - displ, decrypted, destIndex, size);
destIndex += size;
}
else {
byte b = reader.ReadByte();
if (key != null)
b ^= key[destIndex % keyMod];
decrypted[destIndex++] = b;
}
}
}
return decrypted;
}
}
// 1.0.0 - 1.0.4
class DecrypterV100 : DecrypterBase {
// This is the first four bytes of ILProtector's public key token
const uint RESOURCE_MAGIC = 0xC0D31220;
DecrypterV100(Version ilpVersion) {
setVersion(ilpVersion);
this.startOffset = 8;
this.decryptionKey = ilpPublicKeyToken;
this.decryptionKeyMod = 8;
}
public static DecrypterV100 create(IBinaryReader reader) {
reader.Position = 0;
if (reader.Length < 12)
return null;
if (reader.ReadUInt32() != RESOURCE_MAGIC)
return null;
return new DecrypterV100(new Version(reader.ReadByte(), reader.ReadByte(), reader.ReadByte(), reader.ReadByte()));
}
}
// 1.0.5
class DecrypterV105 : DecrypterBase {
DecrypterV105(Version ilpVersion, byte[] key) {
setVersion(ilpVersion);
this.startOffset = 0xA0;
this.decryptionKey = key;
this.decryptionKeyMod = key.Length - 1;
}
public static DecrypterV105 create(IBinaryReader reader) {
reader.Position = 0;
if (reader.Length < 0xA4)
return null;
var key = reader.ReadBytes(0x94);
if (!Utils.compare(reader.ReadBytes(8), ilpPublicKeyToken))
return null;
return new DecrypterV105(new Version(reader.ReadByte(), reader.ReadByte(), reader.ReadByte(), reader.ReadByte()), key);
}
}
// 1.0.6
class DecrypterV106 : DecrypterBase {
byte[] decryptionKey6;
byte[] decryptionKey7;
DecrypterV106(byte[] key0, byte[] key6, byte[] key7, int startOffset) {
this.ilpVersion = "1.0.6";
this.startOffset = startOffset;
this.decryptionKey = key0;
this.decryptionKey6 = key6;
this.decryptionKey7 = key7;
this.decryptionKeyMod = key0.Length - 1;
}
public static DecrypterV106 create(IBinaryReader reader) {
try {
int keyXorOffs2 = (ReadByteAt(reader, 0) ^ ReadByteAt(reader, 2)) + 2;
reader.Position = keyXorOffs2 + (ReadByteAt(reader, 1) ^ ReadByteAt(reader, keyXorOffs2));
int sha1DataLen = reader.Read7BitEncodedInt32() + 0x80;
int keyXorOffs1 = (int)reader.Position;
int encryptedOffs = (int)reader.Position + sha1DataLen;
var sha1Data = reader.ReadBytes(sha1DataLen);
uint crc32 = CRC32.checksum(sha1Data);
reader.Position = reader.Length - 0x18;
uint origCrc32 = reader.ReadUInt32();
if (crc32 != origCrc32)
return null;
var key0 = DeobUtils.sha1Sum(sha1Data); // 1.0.6.0
var key6 = getKey(reader, key0, keyXorOffs1); // 1.0.6.6
var key7 = getKey(reader, key0, keyXorOffs2); // 1.0.6.7
return new DecrypterV106(key0, key6, key7, encryptedOffs);
}
catch (IOException) {
return null;
}
}
static byte[] getKey(IBinaryReader reader, byte[] sha1Sum, int offs) {
var key = (byte[])sha1Sum.Clone();
reader.Position = offs;
for (int i = 0; i < key.Length; i++) {
byte b = reader.ReadByte();
key[i] ^= b;
}
return key;
}
static byte ReadByteAt(IBinaryReader reader, int offs) {
reader.Position = offs;
byte b = reader.ReadByte();
return b;
}
public override byte[] getMethodsData(EmbeddedResource resource) {
var reader = resource.Data;
var keys = new byte[][] { decryptionKey, decryptionKey6, decryptionKey7 };
foreach (var key in keys) {
try {
reader.Position = startOffset;
var decrypted = new byte[reader.Read7BitEncodedUInt32()];
uint origCrc32 = reader.ReadUInt32();
decompress(decrypted, reader, key, decryptionKeyMod);
uint crc32 = CRC32.checksum(decrypted);
if (crc32 == origCrc32)
return decrypted;
}
catch (OutOfMemoryException) {
}
catch (IOException) {
}
}
throw new ApplicationException("Could not decrypt methods data");
}
}
class MethodInfo2 {
public int id;
@ -64,8 +255,8 @@ namespace de4dot.code.deobfuscators.ILProtector {
get { return delegateTypes; }
}
public Version Version {
get { return ilpVersion; }
public string Version {
get { return decrypter == null ? null : decrypter.Version; }
}
public bool Detected {
@ -85,7 +276,8 @@ namespace de4dot.code.deobfuscators.ILProtector {
var reader = resource.Data;
reader.Position = 0;
if (!checkResourceV100(reader) &&
!checkResourceV105(reader))
!checkResourceV105(reader) &&
!checkResourceV106(reader))
continue;
methodsResource = resource;
@ -93,91 +285,31 @@ namespace de4dot.code.deobfuscators.ILProtector {
}
}
// 1.0.0 - 1.0.4
bool checkResourceV100(IBinaryReader reader) {
reader.Position = 0;
if (reader.Length < 12)
return false;
if (reader.ReadUInt32() != RESOURCE_MAGIC)
return false;
ilpVersion = new Version(reader.ReadByte(), reader.ReadByte(), reader.ReadByte(), reader.ReadByte());
startOffset = 8;
decryptionKey = ilpPublicKeyToken;
decryptionKeyMod = 8;
return true;
decrypter = DecrypterV100.create(reader);
return decrypter != null;
}
// 1.0.5+
bool checkResourceV105(IBinaryReader reader) {
reader.Position = 0;
if (reader.Length < 0xA4)
return false;
var key = reader.ReadBytes(0x94);
if (!Utils.compare(reader.ReadBytes(8), ilpPublicKeyToken))
return false;
ilpVersion = new Version(reader.ReadByte(), reader.ReadByte(), reader.ReadByte(), reader.ReadByte());
startOffset = 0xA0;
decryptionKey = key;
decryptionKeyMod = key.Length - 1;
return true;
decrypter = DecrypterV105.create(reader);
return decrypter != null;
}
bool checkResourceV106(IBinaryReader reader) {
decrypter = DecrypterV106.create(reader);
return decrypter != null;
}
public void decrypt() {
if (methodsResource == null)
if (methodsResource == null || decrypter == null)
return;
foreach (var info in readMethodInfos(getMethodsData(methodsResource)))
foreach (var info in readMethodInfos(decrypter.getMethodsData(methodsResource)))
methodInfos[info.id] = info;
restoreMethods();
}
byte[] getMethodsData(EmbeddedResource resource) {
var reader = resource.Data;
reader.Position = 0;
reader.Position = startOffset;
if ((reader.ReadInt32() & 1) != 0)
return decompress(reader);
else
return reader.ReadRemainingBytes();
}
byte[] decompress(IBinaryReader reader) {
return decompress(reader, decryptionKey, decryptionKeyMod);
}
static void copy(byte[] src, int srcIndex, byte[] dst, int dstIndex, int size) {
for (int i = 0; i < size; i++)
dst[dstIndex++] = src[srcIndex++];
}
static byte[] decompress(IBinaryReader reader, byte[] key, int keyMod) {
var decrypted = new byte[reader.Read7BitEncodedUInt32()];
int destIndex = 0;
while (reader.Position < reader.Length) {
byte flags = reader.ReadByte();
for (int mask = 1; mask != 0x100; mask <<= 1) {
if (reader.Position >= reader.Length)
break;
if ((flags & mask) != 0) {
int displ = (int)reader.Read7BitEncodedUInt32();
int size = (int)reader.Read7BitEncodedUInt32();
copy(decrypted, destIndex - displ, decrypted, destIndex, size);
destIndex += size;
}
else {
byte b = reader.ReadByte();
if (key != null)
b ^= key[destIndex % keyMod];
decrypted[destIndex++] = b;
}
}
}
return decrypted;
}
static MethodInfo2[] readMethodInfos(byte[] data) {
var reader = MemoryImageStream.Create(data);
int numMethods = (int)reader.Read7BitEncodedUInt32();