Support Confuser 1.7 r75076 compressor (lzma)
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@ -24,6 +24,7 @@ using Mono.Cecil;
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using Mono.Cecil.Cil;
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using Mono.Cecil.Metadata;
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using de4dot.blocks;
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using SevenZip.Compression.LZMA;
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namespace de4dot.code.deobfuscators.Confuser {
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class RealAssemblyInfo {
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@ -80,6 +81,7 @@ namespace de4dot.code.deobfuscators.Confuser {
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v15_r60785,
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v17_r73404,
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v17_r73477,
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v17_r75076,
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}
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public bool Detected {
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@ -108,7 +110,12 @@ namespace de4dot.code.deobfuscators.Confuser {
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var type = entryPoint.DeclaringType;
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if (!new FieldTypes(type).all(requiredFields))
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return;
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var decyptMethod = findDecryptMethod(type);
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bool use7zip = type.NestedTypes.Count == 6;
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MethodDefinition decyptMethod;
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if (use7zip)
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decyptMethod = findDecryptMethod_7zip(type);
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else
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decyptMethod = findDecryptMethod_inflate(type);
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if (decyptMethod == null)
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return;
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var decryptLocals = new LocalTypes(decyptMethod);
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@ -142,7 +149,9 @@ namespace de4dot.code.deobfuscators.Confuser {
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version = ConfuserVersion.v14_r58852;
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break;
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}
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if (isDecryptMethod_v17_r73404(decyptMethod))
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if (use7zip)
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version = ConfuserVersion.v17_r75076;
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else if (isDecryptMethod_v17_r73404(decyptMethod))
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version = ConfuserVersion.v17_r73404;
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else
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version = ConfuserVersion.v15_r60785;
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@ -157,7 +166,7 @@ namespace de4dot.code.deobfuscators.Confuser {
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simpleDeobfuscator.deobfuscate(cctor);
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simpleDeobfuscator.decryptStrings(cctor, deob);
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if (findEntryPointToken(simpleDeobfuscator, cctor, entryPoint, out entryPointToken))
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if (findEntryPointToken(simpleDeobfuscator, cctor, entryPoint, out entryPointToken) && !use7zip)
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version = ConfuserVersion.v17_r73477;
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mainAsmResource = findResource(cctor);
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@ -332,17 +341,39 @@ namespace de4dot.code.deobfuscators.Confuser {
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return DotNetUtils.getResource(module, DotNetUtils.getCodeStrings(method)) as EmbeddedResource;
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}
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static string[] requiredDecryptLocals = new string[] {
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static string[] requiredDecryptLocals_inflate = new string[] {
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"System.Byte[]",
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"System.IO.Compression.DeflateStream",
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};
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static MethodDefinition findDecryptMethod(TypeDefinition type) {
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static MethodDefinition findDecryptMethod_inflate(TypeDefinition type) {
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foreach (var method in type.Methods) {
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if (!method.IsStatic || method.Body == null)
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continue;
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if (!DotNetUtils.isMethod(method, "System.Byte[]", "(System.Byte[])"))
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continue;
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if (!new LocalTypes(method).all(requiredDecryptLocals))
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if (!new LocalTypes(method).all(requiredDecryptLocals_inflate))
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continue;
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return method;
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}
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return null;
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}
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static string[] requiredDecryptLocals_7zip = new string[] {
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"System.Byte[]",
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"System.Int64",
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"System.IO.BinaryReader",
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"System.IO.MemoryStream",
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"System.Security.Cryptography.CryptoStream",
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"System.Security.Cryptography.RijndaelManaged",
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};
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static MethodDefinition findDecryptMethod_7zip(TypeDefinition type) {
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foreach (var method in type.Methods) {
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if (!method.IsStatic || method.Body == null)
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continue;
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if (!DotNetUtils.isMethod(method, "System.Byte[]", "(System.Byte[])"))
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continue;
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if (!new LocalTypes(method).all(requiredDecryptLocals_7zip))
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continue;
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return method;
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@ -400,6 +431,7 @@ namespace de4dot.code.deobfuscators.Confuser {
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case ConfuserVersion.v15_r60785: return decrypt_v15_r60785(data);
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case ConfuserVersion.v17_r73404: return decrypt_v17_r73404(data);
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case ConfuserVersion.v17_r73477: return decrypt_v17_r73404(data);
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case ConfuserVersion.v17_r75076: return decrypt_v17_r75076(data);
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default: throw new ApplicationException("Unknown version");
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}
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}
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@ -457,6 +489,27 @@ namespace de4dot.code.deobfuscators.Confuser {
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return reader.ReadBytes(reader.ReadInt32());
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}
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byte[] decrypt_v17_r75076(byte[] data) {
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var reader = new BinaryReader(new MemoryStream(data));
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byte[] key, iv;
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data = decrypt_v15_r60785(reader, out key, out iv);
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return sevenzipDecompress(DeobUtils.aesDecrypt(data, key, iv));
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}
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static byte[] sevenzipDecompress(byte[] data) {
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var reader = new BinaryReader(new MemoryStream(data));
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int totalSize = reader.ReadInt32();
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var props = reader.ReadBytes(5);
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var decoder = new Decoder();
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decoder.SetDecoderProperties(props);
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if ((long)totalSize != reader.ReadInt64())
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throw new ApplicationException("Invalid total size");
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long compressedSize = data.Length - props.Length - 8;
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var decompressed = new byte[totalSize];
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decoder.Code(reader.BaseStream, new MemoryStream(decompressed, true), compressedSize, totalSize, null);
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return decompressed;
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}
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public void deobfuscate(Blocks blocks) {
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if (asmResolverMethod == null)
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return;
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