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Support Confuser 1.7 r75076 compressor (lzma)

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This commit is contained in:
de4dot 2012-08-07 19:35:12 +02:00
parent e7f3828078
commit ade379c20b
1 changed files with 59 additions and 6 deletions
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65
de4dot.code/deobfuscators/Confuser/Unpacker.cs
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@ -24,6 +24,7 @@ using Mono.Cecil;
using Mono.Cecil.Cil;
using Mono.Cecil.Metadata;
using de4dot.blocks;
using SevenZip.Compression.LZMA;
namespace de4dot.code.deobfuscators.Confuser {
class RealAssemblyInfo {
@ -80,6 +81,7 @@ namespace de4dot.code.deobfuscators.Confuser {
v15_r60785,
v17_r73404,
v17_r73477,
v17_r75076,
}
public bool Detected {
@ -108,7 +110,12 @@ namespace de4dot.code.deobfuscators.Confuser {
var type = entryPoint.DeclaringType;
if (!new FieldTypes(type).all(requiredFields))
return;
var decyptMethod = findDecryptMethod(type);
bool use7zip = type.NestedTypes.Count == 6;
MethodDefinition decyptMethod;
if (use7zip)
decyptMethod = findDecryptMethod_7zip(type);
else
decyptMethod = findDecryptMethod_inflate(type);
if (decyptMethod == null)
return;
var decryptLocals = new LocalTypes(decyptMethod);
@ -142,7 +149,9 @@ namespace de4dot.code.deobfuscators.Confuser {
version = ConfuserVersion.v14_r58852;
break;
}
if (isDecryptMethod_v17_r73404(decyptMethod))
if (use7zip)
version = ConfuserVersion.v17_r75076;
else if (isDecryptMethod_v17_r73404(decyptMethod))
version = ConfuserVersion.v17_r73404;
else
version = ConfuserVersion.v15_r60785;
@ -157,7 +166,7 @@ namespace de4dot.code.deobfuscators.Confuser {
simpleDeobfuscator.deobfuscate(cctor);
simpleDeobfuscator.decryptStrings(cctor, deob);
if (findEntryPointToken(simpleDeobfuscator, cctor, entryPoint, out entryPointToken))
if (findEntryPointToken(simpleDeobfuscator, cctor, entryPoint, out entryPointToken) && !use7zip)
version = ConfuserVersion.v17_r73477;
mainAsmResource = findResource(cctor);
@ -332,17 +341,39 @@ namespace de4dot.code.deobfuscators.Confuser {
return DotNetUtils.getResource(module, DotNetUtils.getCodeStrings(method)) as EmbeddedResource;
}
static string[] requiredDecryptLocals = new string[] {
static string[] requiredDecryptLocals_inflate = new string[] {
"System.Byte[]",
"System.IO.Compression.DeflateStream",
};
static MethodDefinition findDecryptMethod(TypeDefinition type) {
static MethodDefinition findDecryptMethod_inflate(TypeDefinition type) {
foreach (var method in type.Methods) {
if (!method.IsStatic || method.Body == null)
continue;
if (!DotNetUtils.isMethod(method, "System.Byte[]", "(System.Byte[])"))
continue;
if (!new LocalTypes(method).all(requiredDecryptLocals))
if (!new LocalTypes(method).all(requiredDecryptLocals_inflate))
continue;
return method;
}
return null;
}
static string[] requiredDecryptLocals_7zip = new string[] {
"System.Byte[]",
"System.Int64",
"System.IO.BinaryReader",
"System.IO.MemoryStream",
"System.Security.Cryptography.CryptoStream",
"System.Security.Cryptography.RijndaelManaged",
};
static MethodDefinition findDecryptMethod_7zip(TypeDefinition type) {
foreach (var method in type.Methods) {
if (!method.IsStatic || method.Body == null)
continue;
if (!DotNetUtils.isMethod(method, "System.Byte[]", "(System.Byte[])"))
continue;
if (!new LocalTypes(method).all(requiredDecryptLocals_7zip))
continue;
return method;
@ -400,6 +431,7 @@ namespace de4dot.code.deobfuscators.Confuser {
case ConfuserVersion.v15_r60785: return decrypt_v15_r60785(data);
case ConfuserVersion.v17_r73404: return decrypt_v17_r73404(data);
case ConfuserVersion.v17_r73477: return decrypt_v17_r73404(data);
case ConfuserVersion.v17_r75076: return decrypt_v17_r75076(data);
default: throw new ApplicationException("Unknown version");
}
}
@ -457,6 +489,27 @@ namespace de4dot.code.deobfuscators.Confuser {
return reader.ReadBytes(reader.ReadInt32());
}
byte[] decrypt_v17_r75076(byte[] data) {
var reader = new BinaryReader(new MemoryStream(data));
byte[] key, iv;
data = decrypt_v15_r60785(reader, out key, out iv);
return sevenzipDecompress(DeobUtils.aesDecrypt(data, key, iv));
}
static byte[] sevenzipDecompress(byte[] data) {
var reader = new BinaryReader(new MemoryStream(data));
int totalSize = reader.ReadInt32();
var props = reader.ReadBytes(5);
var decoder = new Decoder();
decoder.SetDecoderProperties(props);
if ((long)totalSize != reader.ReadInt64())
throw new ApplicationException("Invalid total size");
long compressedSize = data.Length - props.Length - 8;
var decompressed = new byte[totalSize];
decoder.Code(reader.BaseStream, new MemoryStream(decompressed, true), compressedSize, totalSize, null);
return decompressed;
}
public void deobfuscate(Blocks blocks) {
if (asmResolverMethod == null)
return;