Support Confuser 1.4 r57884 methods encrypter
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@ -27,6 +27,14 @@ using de4dot.PE;
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namespace de4dot.code.deobfuscators.Confuser {
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class MemoryMethodsDecrypter : MethodsDecrypterBase {
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ConfuserVersion version = ConfuserVersion.Unknown;
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enum ConfuserVersion {
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Unknown,
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v14_r57884,
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vXX,
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}
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public MemoryMethodsDecrypter(ModuleDefinition module, ISimpleDeobfuscator simpleDeobfuscator)
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: base(module, simpleDeobfuscator) {
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}
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@ -42,25 +50,39 @@ namespace de4dot.code.deobfuscators.Confuser {
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return false;
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if (DotNetUtils.getPInvokeMethod(type, "kernel32", "VirtualProtect") == null)
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return false;
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if (!DotNetUtils.hasString(initMethod, "Module error"))
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return false;
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if (!DotNetUtils.hasString(initMethod, "Broken file"))
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return false;
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if ((decryptMethod = findDecryptMethod(type)) == null)
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return false;
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if (!DotNetUtils.hasString(initMethod, "Module error"))
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version = ConfuserVersion.v14_r57884;
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else
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version = ConfuserVersion.vXX;
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return true;
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}
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public void initialize() {
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if (initMethod == null)
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return;
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if (!initializeKeys())
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switch (version) {
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case ConfuserVersion.v14_r57884:
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break;
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case ConfuserVersion.vXX:
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if (!initializeKeys_vXX())
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throw new ApplicationException("Could not find all decryption keys");
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break;
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default:
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throw new ApplicationException("Unknown version");
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}
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}
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bool initializeKeys() {
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bool initializeKeys_vXX() {
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simpleDeobfuscator.deobfuscate(initMethod);
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if (!findLKey0(initMethod, out lkey0))
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return false;
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@ -156,14 +178,63 @@ namespace de4dot.code.deobfuscators.Confuser {
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public bool decrypt(PeImage peImage, byte[] fileData, ref DumpedMethods dumpedMethods) {
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if (initMethod == null)
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return false;
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switch (version) {
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case ConfuserVersion.v14_r57884: return decrypt_v14_r57884(peImage, fileData, ref dumpedMethods);
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case ConfuserVersion.vXX: return decrypt_vXX(peImage, fileData, ref dumpedMethods);
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default: throw new ApplicationException("Unknown version");
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}
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}
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bool decrypt_v14_r57884(PeImage peImage, byte[] fileData, ref DumpedMethods dumpedMethods) {
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methodsData = decryptMethodsData_v14_r57884(peImage);
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var reader = new BinaryReader(new MemoryStream(methodsData));
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reader.ReadInt16(); // sig
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var writer = new BinaryWriter(new MemoryStream(fileData));
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int numInfos = reader.ReadInt32();
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for (int i = 0; i < numInfos; i++) {
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uint rva = reader.ReadUInt32();
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if (rva == 0)
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continue;
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writer.BaseStream.Position = peImage.rvaToOffset(rva);
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writer.Write(reader.ReadBytes(reader.ReadInt32()));
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}
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return true;
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}
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byte[] decryptMethodsData_v14_r57884(PeImage peImage) {
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var reader = peImage.Reader;
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reader.BaseStream.Position = 0;
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var md5SumData = reader.ReadBytes((int)peImage.OptionalHeader.checkSum);
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int csOffs = (int)peImage.OptionalHeader.Offset + 0x40;
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md5SumData[csOffs] = 0;
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md5SumData[csOffs + 1] = 0;
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md5SumData[csOffs + 2] = 0;
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md5SumData[csOffs + 3] = 0;
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var md5Sum = DeobUtils.md5Sum(md5SumData);
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ulong checkSum = reader.ReadUInt64();
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if (checkSum != calcChecksum(md5SumData))
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throw new ApplicationException("Invalid checksum. File has been modified.");
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var iv = reader.ReadBytes(reader.ReadInt32());
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var encrypted = reader.ReadBytes(reader.ReadInt32());
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var decrypted = decrypt(encrypted, iv, md5SumData);
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if (BitConverter.ToInt16(decrypted, 0) != 0x6FD6)
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throw new ApplicationException("Invalid magic");
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return decrypted;
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}
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bool decrypt_vXX(PeImage peImage, byte[] fileData, ref DumpedMethods dumpedMethods) {
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if (peImage.OptionalHeader.checkSum == 0)
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return false;
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methodsData = decryptMethodsData(peImage);
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return decrypt(peImage, fileData);
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return decrypt_vXX(peImage, fileData);
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}
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bool decrypt(PeImage peImage, byte[] fileData) {
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bool decrypt_vXX(PeImage peImage, byte[] fileData) {
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var reader = new BinaryReader(new MemoryStream(methodsData));
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reader.ReadInt16(); // sig
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int numInfos = reader.ReadInt32();
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@ -318,7 +318,7 @@ namespace de4dot.code.deobfuscators.Confuser {
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return memStream.ToArray();
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}
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static ulong calcChecksum(byte[] data) {
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protected static ulong calcChecksum(byte[] data) {
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var sum = DeobUtils.md5Sum(data);
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return BitConverter.ToUInt64(sum, 0) ^ BitConverter.ToUInt64(sum, 8);
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}
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@ -330,7 +330,7 @@ namespace de4dot.code.deobfuscators.Confuser {
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return hash;
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}
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byte[] decrypt(byte[] encrypted, byte[] iv, byte[] streamsBuffer) {
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protected byte[] decrypt(byte[] encrypted, byte[] iv, byte[] streamsBuffer) {
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var decrypted = DeobUtils.aesDecrypt(encrypted, DeobUtils.sha256Sum(streamsBuffer), iv);
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var sha = SHA512.Create();
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var hash = sha.ComputeHash(streamsBuffer);
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