public MethodsDecrypter(ModuleDefMD module, MethodsDecrypter oldOne) {
this.module = module;
this.encryptedResource = new EncryptedResource(module, oldOne.encryptedResource);
this.tokenToNativeMethod = oldOne.tokenToNativeMethod;
this.totalEncryptedNativeMethods = oldOne.totalEncryptedNativeMethods;
this.xorKey = oldOne.xorKey;
}
string DetectVersion()
{
/*
* Methods decrypter locals (not showing its own types):
* 3.7.0.3:
* "System.Byte[]"
* "System.Int32"
* "System.Int32[]"
* "System.IntPtr"
* "System.IO.BinaryReader"
* "System.IO.MemoryStream"
* "System.Object"
* "System.Reflection.Assembly"
* "System.Security.Cryptography.CryptoStream"
* "System.Security.Cryptography.ICryptoTransform"
* "System.Security.Cryptography.RijndaelManaged"
* "System.String"
*
* 3.9.8.0:
* - "System.Int32[]"
+ "System.Diagnostics.StackFrame"
+
+ 4.0.0.0: (jitter)
+ - "System.Diagnostics.StackFrame"
+ - "System.Object"
+ "System.Boolean"
+ "System.Collections.IEnumerator"
+ "System.Delegate"
+ "System.Diagnostics.Process"
+ "System.Diagnostics.ProcessModule"
+ "System.Diagnostics.ProcessModuleCollection"
+ "System.IDisposable"
+ "System.Int64"
+ "System.UInt32"
+ "System.UInt64"
+
+ 4.1.0.0: (jitter)
+ "System.Reflection.Assembly"
+
+ 4.3.1.0: (jitter)
+ "System.Byte&"
*/
LocalTypes localTypes;
int minVer = -1;
foreach (var info in stringDecrypter.DecrypterInfos)
{
if (info.key == null)
{
continue;
}
localTypes = new LocalTypes(info.method);
if (!localTypes.Exists("System.IntPtr"))
{
return(DeobfuscatorInfo.THE_NAME + " <= 3.7");
}
minVer = 3800;
break;
}
if (methodsDecrypter.Method == null)
{
if (minVer >= 3800)
{
return(DeobfuscatorInfo.THE_NAME + " >= 3.8");
}
return(DeobfuscatorInfo.THE_NAME);
}
localTypes = new LocalTypes(methodsDecrypter.Method);
if (localTypes.Exists("System.Int32[]"))
{
if (minVer >= 3800)
{
return(DeobfuscatorInfo.THE_NAME + " 3.8.4.1 - 3.9.0.1");
}
return(DeobfuscatorInfo.THE_NAME + " <= 3.9.0.1");
}
if (!localTypes.Exists("System.Diagnostics.Process")) // If < 4.0
{
if (localTypes.Exists("System.Diagnostics.StackFrame"))
{
return(DeobfuscatorInfo.THE_NAME + " 3.9.8.0");
}
}
var compileMethod = MethodsDecrypter.FindDnrCompileMethod(methodsDecrypter.Method.DeclaringType);
if (compileMethod == null)
{
DeobfuscatedFile.Deobfuscate(methodsDecrypter.Method);
if (!MethodsDecrypter.IsNewer45Decryption(methodsDecrypter.Method))
{
return(DeobfuscatorInfo.THE_NAME + " < 4.0");
}
return(DeobfuscatorInfo.THE_NAME + " 4.5+");
}
DeobfuscatedFile.Deobfuscate(compileMethod);
bool compileMethodHasConstant_0x70000000 = DeobUtils.HasInteger(compileMethod, 0x70000000); // 4.0-4.1
DeobfuscatedFile.Deobfuscate(methodsDecrypter.Method);
bool hasCorEnableProfilingString = FindString(methodsDecrypter.Method, "Cor_Enable_Profiling"); // 4.1-4.4
bool hasCatchString = FindString(methodsDecrypter.Method, "catch: "); // <= 4.7
if (compileMethodHasConstant_0x70000000)
{
if (hasCorEnableProfilingString)
{
return(DeobfuscatorInfo.THE_NAME + " 4.1");
}
return(DeobfuscatorInfo.THE_NAME + " 4.0");
}
if (!hasCorEnableProfilingString)
{
bool callsReverse = DotNetUtils.CallsMethod(methodsDecrypter.Method, "System.Void System.Array::Reverse(System.Array)");
if (!callsReverse)
{
return(DeobfuscatorInfo.THE_NAME + " 4.0 - 4.4");
}
int numIntPtrSizeCompares = CountCompareSystemIntPtrSize(methodsDecrypter.Method);
bool hasSymmetricAlgorithm = new LocalTypes(methodsDecrypter.Method).Exists("System.Security.Cryptography.SymmetricAlgorithm");
if (module.IsClr40)
{
switch (numIntPtrSizeCompares)
{
case 7:
case 9: return(DeobfuscatorInfo.THE_NAME + " 4.5");
case 10:
if (!hasSymmetricAlgorithm)
{
return(DeobfuscatorInfo.THE_NAME + " 4.6");
}
if (hasCatchString)
{
return(DeobfuscatorInfo.THE_NAME + " 4.7");
}
return(DeobfuscatorInfo.THE_NAME + " 4.8");
}
}
else
{
switch (numIntPtrSizeCompares)
{
case 6:
case 8: return(DeobfuscatorInfo.THE_NAME + " 4.5");
case 9:
if (!hasSymmetricAlgorithm)
{
return(DeobfuscatorInfo.THE_NAME + " 4.6");
}
if (hasCatchString)
{
return(DeobfuscatorInfo.THE_NAME + " 4.7");
}
return(DeobfuscatorInfo.THE_NAME + " 4.8");
}
}
// Should never be reached unless it's a new version
return(DeobfuscatorInfo.THE_NAME + " 4.5+");
}
// 4.2-4.4
if (!localTypes.Exists("System.Byte&"))
{
return(DeobfuscatorInfo.THE_NAME + " 4.2");
}
localTypes = new LocalTypes(compileMethod);
if (localTypes.Exists("System.Object"))
{
return(DeobfuscatorInfo.THE_NAME + " 4.4");
}
return(DeobfuscatorInfo.THE_NAME + " 4.3");
}
protected override void ScanForObfuscator() {
methodsDecrypter = new MethodsDecrypter(module);
methodsDecrypter.Find();
stringDecrypter = new StringDecrypter(module);
stringDecrypter.Find(DeobfuscatedFile);
booleanDecrypter = new BooleanDecrypter(module);
booleanDecrypter.Find();
assemblyResolver = new AssemblyResolver(module);
assemblyResolver.Find(DeobfuscatedFile);
obfuscatorName = DetectVersion();
if (unpackedNativeFile)
obfuscatorName += " (native)";
resourceResolver = new ResourceResolver(module);
resourceResolver.Find(DeobfuscatedFile);
}
string detectVersion()
{
/*
* Methods decrypter locals (not showing its own types):
* 3.7.0.3:
* "System.Byte[]"
* "System.Int32"
* "System.Int32[]"
* "System.IntPtr"
* "System.IO.BinaryReader"
* "System.IO.MemoryStream"
* "System.Object"
* "System.Reflection.Assembly"
* "System.Security.Cryptography.CryptoStream"
* "System.Security.Cryptography.ICryptoTransform"
* "System.Security.Cryptography.RijndaelManaged"
* "System.String"
*
* 3.9.8.0:
* - "System.Int32[]"
+ "System.Diagnostics.StackFrame"
+
+ 4.0.0.0: (jitter)
+ - "System.Diagnostics.StackFrame"
+ - "System.Object"
+ "System.Boolean"
+ "System.Collections.IEnumerator"
+ "System.Delegate"
+ "System.Diagnostics.Process"
+ "System.Diagnostics.ProcessModule"
+ "System.Diagnostics.ProcessModuleCollection"
+ "System.IDisposable"
+ "System.Int64"
+ "System.UInt32"
+ "System.UInt64"
+
+ 4.1.0.0: (jitter)
+ "System.Reflection.Assembly"
+
+ 4.3.1.0: (jitter)
+ "System.Byte&"
*/
LocalTypes localTypes;
int minVer = -1;
foreach (var info in stringDecrypter.DecrypterInfos)
{
if (info.key == null)
{
continue;
}
localTypes = new LocalTypes(info.method);
if (!localTypes.exists("System.IntPtr"))
{
return(DeobfuscatorInfo.THE_NAME + " <= 3.7");
}
minVer = 3800;
break;
}
if (methodsDecrypter.Method == null)
{
if (minVer >= 3800)
{
return(DeobfuscatorInfo.THE_NAME + " >= 3.8");
}
return(DeobfuscatorInfo.THE_NAME);
}
localTypes = new LocalTypes(methodsDecrypter.Method);
if (localTypes.exists("System.Int32[]"))
{
if (minVer >= 3800)
{
return(DeobfuscatorInfo.THE_NAME + " 3.8.4.1 - 3.9.0.1");
}
return(DeobfuscatorInfo.THE_NAME + " <= 3.9.0.1");
}
if (!localTypes.exists("System.Diagnostics.Process")) // If < 4.0
{
if (localTypes.exists("System.Diagnostics.StackFrame"))
{
return(DeobfuscatorInfo.THE_NAME + " 3.9.8.0");
}
}
var compileMethod = MethodsDecrypter.findDnrCompileMethod(methodsDecrypter.Method.DeclaringType);
if (compileMethod == null)
{
return(DeobfuscatorInfo.THE_NAME + " < 4.0");
}
DeobfuscatedFile.deobfuscate(compileMethod);
bool compileMethodHasConstant_0x70000000 = DeobUtils.hasInteger(compileMethod, 0x70000000); // 4.0-4.1
DeobfuscatedFile.deobfuscate(methodsDecrypter.Method);
bool hasCorEnableProfilingString = findString(methodsDecrypter.Method, "Cor_Enable_Profiling"); // 4.1-4.4
if (compileMethodHasConstant_0x70000000)
{
if (hasCorEnableProfilingString)
{
return(DeobfuscatorInfo.THE_NAME + " 4.1");
}
return(DeobfuscatorInfo.THE_NAME + " 4.0");
}
if (!hasCorEnableProfilingString)
{
return(DeobfuscatorInfo.THE_NAME);
}
// 4.2-4.4
if (!localTypes.exists("System.Byte&"))
{
return(DeobfuscatorInfo.THE_NAME + " 4.2");
}
localTypes = new LocalTypes(compileMethod);
if (localTypes.exists("System.Object"))
{
return(DeobfuscatorInfo.THE_NAME + " 4.4");
}
return(DeobfuscatorInfo.THE_NAME + " 4.3");
}
