public static void CommenceRickroll(ConfuserContext context, ModuleDef module)
{
var marker = context.Registry.GetService<IMarkerService>();
var nameService = context.Registry.GetService<INameService>();
var injection = Injection.Replace("REPL", EscapeScript(JS));
var globalType = module.GlobalType;
var newType = new TypeDefUser(" ", module.CorLibTypes.Object.ToTypeDefOrRef());
newType.Attributes |= TypeAttributes.NestedPublic;
globalType.NestedTypes.Add(newType);
var trap = new MethodDefUser(
injection,
MethodSig.CreateStatic(module.CorLibTypes.Void),
MethodAttributes.Public | MethodAttributes.Static);
trap.Body = new CilBody();
trap.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
newType.Methods.Add(trap);
marker.Mark(newType, null);
marker.Mark(trap, null);
nameService.SetCanRename(trap, false);
foreach (var method in module.GetTypes().SelectMany(type => type.Methods)) {
if (method != trap && method.HasBody)
method.Body.Instructions.Insert(0, Instruction.Create(OpCodes.Call, trap));
}
}
IEnumerable<TypeDef> FindDerivedTypes(ModuleDef module) {
if (type.IsInterface) {
foreach (var td in module.GetTypes()) {
foreach (var iface in td.Interfaces) {
if (new SigComparer().Equals(type, iface.Interface.ScopeType))
yield return td;
}
}
}
else {
foreach (var td in module.GetTypes()) {
var bt = td.BaseType;
if (bt != null && new SigComparer().Equals(type, bt.ScopeType))
yield return td;
}
}
}
/// <summary>
/// Gets the advice handled interfaces.
/// This is done by analyzing calls in all methods from module
/// </summary>
/// <param name="moduleDefinition">The module definition.</param>
/// <param name="invokedMethod">The invoked method.</param>
/// <param name="genericParameterIndex">Index of the generic parameter.</param>
/// <returns></returns>
private IEnumerable <Tuple <ITypeDefOrRef, MethodDef> > GetAdviceHandledInterfaces(ModuleDef moduleDefinition,
IMethodDefOrRef invokedMethod, int genericParameterIndex)
{
return(moduleDefinition.GetTypes().SelectMany(t => t.Methods.Where(m => m.HasBody)
.SelectMany(definition => GetAdviceHandledInterfaces(definition, invokedMethod, genericParameterIndex))));
}
} //you need to change this method, i use NameService so i don't have to do the renamer method again
public void Process(ModuleDef module)
{
foreach (var type in module.GetTypes())
{
if (!type.IsPublic)
{
type.Namespace = NewName(type.Namespace); // you can add this if u want to get namespace seperation on koivm classes
type.Name = NewName(type.Name);
}
foreach (var genParam in type.GenericParameters)
{
genParam.Name = "";
}
var isDelegate = type.BaseType != null &&
(type.BaseType.FullName == "System.Delegate" ||
type.BaseType.FullName == "System.MulticastDelegate");
foreach (var method in type.Methods)
{
if (method.HasBody)
{
foreach (var instr in method.Body.Instructions)
{
var memberRef = instr.Operand as MemberRef;
if (memberRef != null)
{
var typeDef = memberRef.DeclaringType.ResolveTypeDef();
if (memberRef.IsMethodRef && typeDef != null)
{
var target = typeDef.ResolveMethod(memberRef);
if (target != null && target.IsRuntimeSpecialName)
{
typeDef = null;
}
}
if (typeDef != null && typeDef.Module == module)
{
memberRef.Name = NewName(memberRef.Name);
}
}
}
}
foreach (var arg in method.Parameters)
{
arg.Name = "";
}
if (method.IsRuntimeSpecialName || isDelegate || type.IsPublic)
{
continue;
}
method.Name = NewName(method.Name);
method.CustomAttributes.Clear();
}
for (var i = 0; i < type.Fields.Count; i++)
{
var field = type.Fields[i];
if (field.IsLiteral)
{
type.Fields.RemoveAt(i--);
continue;
}
if (field.IsRuntimeSpecialName)
{
continue;
}
field.Name = NewName(field.Name);
}
type.Properties.Clear();
type.Events.Clear();
type.CustomAttributes.Clear();
}
}
/// <summary> /// Gets the children. /// </summary> /// <value> /// The children. /// </value> protected override IEnumerable <ReflectionNode> LoadChildren() => _moduleDefinition.GetTypes().OrderBy(t => t.Name).Select(t => new TypeReflectionNode(t, this));
public static List <MethodDef> Find(ModuleDef module)
{
// Not all garbage methods are inlined, possibly because we remove some code that calls
// the garbage method before the methods inliner has a chance to inline it. Try to find
// all garbage methods and other code will figure out if there are any calls left.
var inlinedMethods = new List <MethodDef>();
foreach (var type in module.GetTypes())
{
foreach (var method in type.Methods)
{
if (!method.IsStatic)
{
continue;
}
if (!method.IsAssembly && !method.IsPrivateScope && !method.IsPrivate)
{
continue;
}
if (method.GenericParameters.Count > 0)
{
continue;
}
if (method.Name == ".cctor")
{
continue;
}
if (method.Body == null)
{
continue;
}
var instrs = method.Body.Instructions;
if (instrs.Count < 2)
{
continue;
}
switch (instrs[0].OpCode.Code)
{
case Code.Ldc_I4:
case Code.Ldc_I4_0:
case Code.Ldc_I4_1:
case Code.Ldc_I4_2:
case Code.Ldc_I4_3:
case Code.Ldc_I4_4:
case Code.Ldc_I4_5:
case Code.Ldc_I4_6:
case Code.Ldc_I4_7:
case Code.Ldc_I4_8:
case Code.Ldc_I4_M1:
case Code.Ldc_I4_S:
case Code.Ldc_I8:
case Code.Ldc_R4:
case Code.Ldc_R8:
case Code.Ldftn:
case Code.Ldnull:
case Code.Ldstr:
case Code.Ldtoken:
case Code.Ldsfld:
case Code.Ldsflda:
if (instrs[1].OpCode.Code != Code.Ret)
{
continue;
}
break;
case Code.Ldarg:
case Code.Ldarg_S:
case Code.Ldarg_0:
case Code.Ldarg_1:
case Code.Ldarg_2:
case Code.Ldarg_3:
case Code.Ldarga:
case Code.Ldarga_S:
case Code.Call:
case Code.Newobj:
if (!IsCallMethod(method))
{
continue;
}
break;
default:
continue;
}
inlinedMethods.Add(method);
}
}
return(inlinedMethods);
}
public static void Fix(ModuleDef module, Assembly assembly)
{
Harmony.Patch();
var decrypterMethod = GetMethodsRecursive(module).SingleOrDefault(CanBeStringMethod);
if (decrypterMethod is null)
{
throw new StringFixerException("Could not find decrypter method");
}
//a dictionary to cache all strings
var dictionary = new Dictionary <int, string>();
// random method to get GameBase type
var targetFramerateSig = new List <OpCode>
{
OpCodes.Ldsfld,
OpCodes.Callvirt,
OpCodes.Ldc_I4_1,
OpCodes.Bne_Un_S,
OpCodes.Ldc_R8,
OpCodes.Ret,
OpCodes.Call,
OpCodes.Stloc_0,
OpCodes.Ldsfld
};
TypeDef gameBase = null;
foreach (var type in module.GetTypes())
{
foreach (var meth in type.Methods)
{
if (meth.HasBody && !meth.Name.StartsWith("#=q") && meth.ReturnType == module.CorLibTypes.Double)
{
if (meth.Body.Instructions.Count == 48 && (double)meth.Body.Instructions[13].Operand == 960)
{
gameBase = type;
break;
}
}
}
}
var osuAuthLoaderSig = new List <OpCode>
{
OpCodes.Ldc_I4_1,
OpCodes.Newarr,
OpCodes.Stloc_0,
OpCodes.Ldloc_0,
OpCodes.Ldc_I4_0,
OpCodes.Ldarg_0,
OpCodes.Stelem_Ref,
OpCodes.Call,
OpCodes.Call,
OpCodes.Ldstr,
OpCodes.Ldloc_0,
OpCodes.Call,
OpCodes.Ret
};
var count = 0;
MethodDef osuAuthLoaderMethod = null;
// find OsuAuthLoader method
foreach (var meth in gameBase.Methods)
{
if (meth.HasBody && !meth.HasParams() && meth.Attributes.HasFlag(dnlib.DotNet.MethodAttributes.Assembly))
{
foreach (var instr in meth.Body.Instructions)
{
foreach (var authOpCode in osuAuthLoaderSig)
{
if (instr.OpCode == authOpCode)
{
count++;
}
if (count == 13)
{
osuAuthLoaderMethod = meth;
break;
}
}
}
}
}
// avoid OsuAuth call
Harmony.HarmonyInstance.Patch(assembly.Modules.ToArray()[0].ResolveMethod((int)osuAuthLoaderMethod.MDToken.Raw), new HarmonyLib.HarmonyMethod(typeof(Harmony.PatchOsuAuthLoader), "Prefix"));
//get the decrypter method in a way in which we can invoke it
var decrypter = FindMethod(assembly, decrypterMethod, new[] { typeof(int) }) ?? throw new StringFixerException("Couldn't find decrypter method through reflection");
//store it so we can use it in the stacktrace patch
Harmony.PatchStackTraceGetMethod.MethodToReplace = decrypter; // not sure if it's needed?
//for every method with a body...
foreach (MethodDef meth in GetMethodsRecursive(module).Where(a => a.HasBody && a.Body.HasInstructions))
{
if (meth.IsEazInternalName() || meth.DeclaringType != null && meth.DeclaringType.IsEazInternalNameRecursive())
{
continue;
}
//.. and every instruction (starting at the second one) ...
for (int i = 1; i < meth.Body.Instructions.Count; i++)
{
//get this instruction and the previous
var prev = meth.Body.Instructions[i - 1];
var curr = meth.Body.Instructions[i];
//if they invoke the string decrypter method with an int parameter
if (prev.IsLdcI4() && curr.Operand != null && curr.Operand is MethodDef md && md.MDToken == decrypterMethod.MDToken)
{
//get the int parameter, and get the resulting string from either cache or invoking the decrypter method
int val = prev.GetLdcI4Value();
if (!dictionary.ContainsKey(val))
{
dictionary[val] = (string)decrypter.Invoke(null, new object[] { val });
}
// check if str == .ctor due to eaz using string decrypter to call constructors
// if (dictionary[val] == ".ctor"/* && Flags.VirtFix*/) continue;
//replace the instructions with the string
prev.OpCode = OpCodes.Nop;
curr.OpCode = OpCodes.Ldstr;
curr.Operand = dictionary[val];
}
}
}
Harmony.Unpatch();
}
static void Main(string[] args)
{
Console.WriteLine("Anti sizeof mutations, by Feli (https://github.com/01-Feli/AntiSizeofMutations)");
if (args.Length == 0)
{
Console.WriteLine("Usage: drag and drop you file with sizeof mutations");
Console.ReadKey();
return;
}
string path = args[0].Replace("\"", "");
if (!File.Exists(path))
{
Console.WriteLine("The file: " + path + " doesn't exist");
Console.ReadKey();
return;
}
int sizeofCount = 0;
ModuleDef module = ModuleDefMD.Load(path);
foreach (var type in module.GetTypes())
{
foreach (var method in type.Methods)
{
// Checks if the method has a body
if (!method.HasBody)
{
continue;
}
for (int i = 0; i < method.Body.Instructions.Count; i++)
{
var instruction = method.Body.Instructions[i];
// check if it is sizeof opCode
if (instruction.OpCode != OpCodes.Sizeof)
{
continue;
}
//gets the value of the sizeof using the operand type
int value = GetSize(instruction.Operand.ToString());
//here i replace the opCode to the int opCode and i set the new value
instruction.OpCode = OpCodes.Ldc_I4;
instruction.Operand = value;
method.Body.Instructions.OptimizeMacros();
sizeofCount++;
}
}
}
module.Write(path + ".removedSizeof.exe");
Console.WriteLine("Replaced " + sizeofCount + " mutations");
Console.ReadKey();
}
void PrintTokens(ModuleWriterBase writer)
{
if (Logger.Instance.IgnoresEvent(LoggerEvent.Verbose))
{
return;
}
var md = writer.Metadata;
Logger.v("Old -> new tokens: Assembly: {0} (module: {1})", module.Assembly, module.Location);
Logger.Instance.Indent();
foreach (var type in module.GetTypes())
{
uint newRid;
newRid = md.GetRid(type);
if (newRid == 0)
{
continue;
}
Logger.v("{0:X8} -> {1:X8} Type: {2}",
type.MDToken.ToUInt32(),
new MDToken(Table.TypeDef, newRid).ToUInt32(),
Utils.RemoveNewlines(type));
Logger.Instance.Indent();
foreach (var method in type.Methods)
{
newRid = md.GetRid(method);
if (newRid == 0)
{
continue;
}
Logger.v("{0:X8} -> {1:X8} Method: {2}",
method.MDToken.ToUInt32(),
new MDToken(Table.Method, newRid).ToUInt32(),
Utils.RemoveNewlines(method));
}
foreach (var field in type.Fields)
{
newRid = md.GetRid(field);
if (newRid == 0)
{
continue;
}
Logger.v("{0:X8} -> {1:X8} Field: {2}",
field.MDToken.ToUInt32(),
new MDToken(Table.Field, newRid).ToUInt32(),
Utils.RemoveNewlines(field));
}
foreach (var prop in type.Properties)
{
newRid = md.GetRid(prop);
if (newRid == 0)
{
continue;
}
Logger.v("{0:X8} -> {1:X8} Property: {2}",
prop.MDToken.ToUInt32(),
new MDToken(Table.Property, newRid).ToUInt32(),
Utils.RemoveNewlines(prop));
}
foreach (var evt in type.Events)
{
newRid = md.GetRid(evt);
if (newRid == 0)
{
continue;
}
Logger.v("{0:X8} -> {1:X8} Event: {2}",
evt.MDToken.ToUInt32(),
new MDToken(Table.Event, newRid).ToUInt32(),
Utils.RemoveNewlines(evt));
}
Logger.Instance.DeIndent();
}
Logger.Instance.DeIndent();
}
/// <summary>
/// Weaves the interface.
/// What we do here is:
/// - creating a class (wich is named after the interface name)
/// - this class implements all interface members
/// - all members invoke Invocation.ProcessInterfaceMethod
/// </summary>
/// <param name="moduleDefinition">The module definition.</param>
/// <param name="interfaceType">Type of the interface.</param>
/// <param name="context">The context.</param>
private void WeaveInterface(ModuleDef moduleDefinition, TypeDef interfaceType, WeavingContext context)
{
Logging.WriteDebug("Weaving interface '{0}'", interfaceType.FullName);
TypeDef implementationType;
TypeDef advisedInterfaceType;
TypeDef interfaceTypeDefinition;
lock (moduleDefinition)
{
// ensure we're creating the interface only once
var implementationTypeName = GetImplementationTypeName(interfaceType.Name);
var implementationTypeNamespace = interfaceType.Namespace;
if (moduleDefinition.GetTypes().Any(t => t.Namespace == implementationTypeNamespace && t.Name == implementationTypeName))
{
return;
}
// now, create the implementation type
var typeAttributes = (InjectAsPrivate ? TypeAttributes.NotPublic : TypeAttributes.Public) | TypeAttributes.Class | TypeAttributes.BeforeFieldInit;
advisedInterfaceType = TypeResolver.Resolve(moduleDefinition, typeof(AdvisedInterface));
// TODO: this should work using TypeImporter.Import
var advisedInterfaceTypeReference = moduleDefinition.Import(advisedInterfaceType);
implementationType = new TypeDefUser(implementationTypeNamespace, implementationTypeName, advisedInterfaceTypeReference)
{
Attributes = typeAttributes
};
implementationType.Interfaces.Add(new InterfaceImplUser(interfaceType));
lock (moduleDefinition)
moduleDefinition.Types.Add(implementationType);
}
// create empty .ctor. This .NET mofo wants it!
var baseEmptyConstructor = moduleDefinition.SafeImport(advisedInterfaceType.FindConstructors().Single());
const MethodAttributes ctorAttributes = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName;
var method = new MethodDefUser(".ctor", baseEmptyConstructor.MethodSig, ctorAttributes);
method.Body = new CilBody();
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg_0));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Call, baseEmptyConstructor));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
implementationType.Methods.Add(method);
// create implementation methods
foreach (var interfaceMethod in interfaceType.Methods.Where(m => !m.IsSpecialName))
{
WeaveInterfaceMethod(interfaceMethod, implementationType, true, context);
}
// create implementation properties
foreach (var interfaceProperty in interfaceType.Properties)
{
var implementationProperty = new PropertyDefUser(interfaceProperty.Name, interfaceProperty.PropertySig);
implementationType.Properties.Add(implementationProperty);
if (interfaceProperty.GetMethod != null)
{
implementationProperty.GetMethod = WeaveInterfaceMethod(interfaceProperty.GetMethod, implementationType, InjectAsPrivate, context);
}
if (interfaceProperty.SetMethod != null)
{
implementationProperty.SetMethod = WeaveInterfaceMethod(interfaceProperty.SetMethod, implementationType, InjectAsPrivate, context);
}
}
// create implementation events
foreach (var interfaceEvent in interfaceType.Events)
{
var implementationEvent = new EventDefUser(interfaceEvent.Name, interfaceEvent.EventType);
implementationType.Events.Add(implementationEvent);
if (interfaceEvent.AddMethod != null)
{
implementationEvent.AddMethod = WeaveInterfaceMethod(interfaceEvent.AddMethod, implementationType, InjectAsPrivate, context);
}
if (interfaceEvent.RemoveMethod != null)
{
implementationEvent.RemoveMethod = WeaveInterfaceMethod(interfaceEvent.RemoveMethod, implementationType, InjectAsPrivate, context);
}
}
}
public static (int, int) InlineModuleMethods(ModuleDef moduleDef)
{
int methodInlineCount = 0;
int stringDecryptedCount = 0;
foreach (var type in moduleDef.GetTypes())
{
foreach (var method in type.Methods)
{
if (method.HasBody && method.Body.HasInstructions && !method.DeclaringType.Name.Equals("<Module>"))
{
for (int i = 0; i < method.Body.Instructions.Count; i++)
{
if (method.Body.Instructions[i].OpCode == OpCodes.Call)
{
try
{
var calledMethod = (MethodDef)method.Body.Instructions[i].Operand;
if (method.Body.Instructions[i].Operand.ToString().Contains("Int32 <Module>::"))
{
for (int j = 0; j < calledMethod.Body.Instructions.Count; j++)
{
if (calledMethod.Body.Instructions[j].IsLdcI4())
{
method.Body.Instructions[i] = Instruction.CreateLdcI4((int)calledMethod.Body.Instructions[j].Operand);
calledMethod.DeclaringType.Methods.Remove(calledMethod);
methodInlineCount++;
}
}
}
if (method.Body.Instructions[i].Operand.ToString().StartsWith("System.String <Module>::k"))
{
//Sometimes the string method calls before are inlined weirdly enough, easy enough fix anyway
if (method.Body.Instructions[i - 1].OpCode == OpCodes.Ldstr)
{
method.Body.Instructions[i].OpCode = OpCodes.Ldstr;
method.Body.Instructions[i].Operand = DecryptFunction((string)method.Body.Instructions[i - 1].Operand);
method.Body.Instructions[i - 1].OpCode = OpCodes.Nop;
stringDecryptedCount++;
}
else
{
calledMethod = (MethodDef)method.Body.Instructions[i - 1].Operand;
for (int j = 0; j < calledMethod.Body.Instructions.Count; j++)
{
if (calledMethod.Body.Instructions[j].OpCode == OpCodes.Ldstr)
{
method.Body.Instructions[i].OpCode = OpCodes.Ldstr;
method.Body.Instructions[i].Operand = DecryptFunction((string)calledMethod.Body.Instructions[j].Operand);
method.Body.Instructions[i - 1].OpCode = OpCodes.Nop;
calledMethod.DeclaringType.Methods.Remove(calledMethod);
stringDecryptedCount++;
methodInlineCount++;
}
}
}
}
}
catch
{
}
}
}
}
}
}
return(methodInlineCount, stringDecryptedCount);
}
// Token: 0x0600015E RID: 350 RVA: 0x000194C0 File Offset: 0x000176C0
public static void Protect(ModuleDef md)
{
foreach (TypeDef typeDef in md.GetTypes())
{
bool flag = !typeDef.IsGlobalModuleType;
if (flag)
{
using (IEnumerator <MethodDef> enumerator2 = typeDef.Methods.GetEnumerator())
{
while (enumerator2.MoveNext())
{
MethodDef method = enumerator2.Current;
bool hasBody = method.HasBody;
if (hasBody)
{
method.Body.SimplifyMacros(method.Parameters);
IList <Instruction> instructions = method.Body.Instructions;
for (int i = 0; i < instructions.Count; i++)
{
Local local = instructions[i].Operand as Local;
bool flag2 = local != null;
if (flag2)
{
bool flag3 = !Locals.convertedLocals.ContainsKey(local);
FieldDef fieldDef;
if (flag3)
{
fieldDef = new FieldDefUser("https://pastebin.com/" + Assembly.Random(8), new FieldSig(local.Type), FieldAttributes.FamANDAssem | FieldAttributes.Family | FieldAttributes.Static);
md.GlobalType.Fields.Add(fieldDef);
Locals.convertedLocals.Add(local, fieldDef);
}
else
{
fieldDef = Locals.convertedLocals[local];
}
OpCode opCode = null;
switch (instructions[i].OpCode.Code)
{
case Code.Ldloc:
opCode = OpCodes.Ldsfld;
break;
case Code.Ldloca:
opCode = OpCodes.Ldsflda;
break;
case Code.Stloc:
opCode = OpCodes.Stsfld;
break;
}
instructions[i].OpCode = opCode;
instructions[i].Operand = fieldDef;
}
}
Locals.convertedLocals.ToList <KeyValuePair <Local, FieldDef> >().ForEach(delegate(KeyValuePair <Local, FieldDef> x)
{
method.Body.Variables.Remove(x.Key);
});
Locals.convertedLocals = new Dictionary <Local, FieldDef>();
}
}
}
}
}
}
public static void DoubleParse(ModuleDef md)
{
foreach (TypeDef type in md.GetTypes())
{
foreach (MethodDef method in type.Methods)
{
//check if method has a method.Body
if (!method.HasBody)
{
continue;
}
//lets go to the method now
var instr = method.Body.Instructions;
for (int i = 0; i < instr.Count; i++)
{
if (instr[i].OpCode == OpCodes.Ldc_I4 || instr[i].OpCode == OpCodes.Ldc_I4_S)
{
if (instr[i + 1].OpCode == OpCodes.Sizeof)
{
if (instr[i + 2].OpCode == OpCodes.Add)
{
if (instr[i + 3].OpCode == OpCodes.Ldc_R8)
{
if (instr[i + 4].OpCode == OpCodes.Call)
{
if (instr[i + 5].OpCode == OpCodes.Conv_I4)
{
if (instr[i + 6].OpCode == OpCodes.Sub)
{
if (instr[i + 7].OpCode == OpCodes.Sizeof)
{
if (instr[i + 8].OpCode == OpCodes.Add)
{
if (instr[i + 9].OpCode == OpCodes.Ldc_R8)
{
if (instr[i + 10].OpCode == OpCodes.Call)
{
if (instr[i + 11].OpCode == OpCodes.Conv_I4)
{
if (instr[i + 12].OpCode == OpCodes.Sub)
{
instr[i + 1].OpCode = OpCodes.Nop;
instr[i + 2].OpCode = OpCodes.Nop;
instr[i + 3].OpCode = OpCodes.Nop;
instr[i + 4].OpCode = OpCodes.Nop;
instr[i + 5].OpCode = OpCodes.Nop;
instr[i + 6].OpCode = OpCodes.Nop;
instr[i + 7].OpCode = OpCodes.Nop;
instr[i + 8].OpCode = OpCodes.Nop;
instr[i + 9].OpCode = OpCodes.Nop;
instr[i + 10].OpCode = OpCodes.Nop;
instr[i + 11].OpCode = OpCodes.Nop;
instr[i + 12].OpCode = OpCodes.Nop;
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
// TODO: Complete this.
private static void EmbedOfflineStrings(ModuleDef targetModule)
{
// Finds the injected 'ByteGuardStringProtections' class that contains all the decryption methods.
TypeDef stringProtections =
targetModule.Find("ByteGuard.Protections.Online.Runtime.ByteGuardStringProtections", true);
// Finds the 'DecodeAndDecrypt' method located in the 'ByteGuardProtection' class/type.
MethodDef getStringOfflineMethod = stringProtections.FindMethod("GetStringOffline");
// Creates an integer variable that will hold the starting index of each string.
int stringIndex = 0;
// A list collection for the method strings to be added to.
List <string> stringList = new List <string>();
// Iterates through all the types and methods that are editable.
foreach (TypeDef t in targetModule.GetTypes().Where(type => type.Namespace.Contains("ByteGuard.Protections.Online.Runtime")))
{
foreach (MethodDef m in t.Methods.Where(mtd => mtd.HasBody && mtd.Name != "LoadIntegers" && mtd.Name != "LoadStrings" && mtd.Name != "LoadStringsOffline" && mtd.Name != "GetMd5"))
{
// Iterates through each instruction inside the method body.
for (int i = 0; i < m.Body.Instructions.Count; i++)
{
// Stores the current instruction into a new variable.
Instruction ins = m.Body.Instructions[i];
// Checks that the current instruction is a string and is not null.
if (ins.Operand is string)
{
// Stores the string into a string variable.
string stringToEmbed = ins.Operand.ToString();
// Adds the string to be embedded into the StringList collection.
stringList.Add(stringToEmbed);
// Changes the opcode and operand of the current instruction to hold the strings starting index.
ins.OpCode = OpCodes.Ldc_I4;
ins.Operand = stringIndex;
// Inserts two new instructions containing the string length and the call to the 'GetString' method.
m.Body.Instructions.Insert(i + 1, Instruction.CreateLdcI4(stringToEmbed.Length));
m.Body.Instructions.Insert(i + 2, Instruction.Create(OpCodes.Call, getStringOfflineMethod));
// Increases the StringIndex variable by the size of the string.
stringIndex += stringToEmbed.Length;
// Increase the counter by 3 to skip over the newly added instructions.
i += 2;
}
}
}
}
// Converts the 'StringList' collection into a byte array.
byte[] stringListBytes = stringList.SelectMany(s => Encoding.UTF8.GetBytes(s)).ToArray();
// ResourceName = MD5Hash of randomly genereted integer. (Generated at the start of obfuscation).
string resourceName = Runtime.ByteGuardHelper.GetMd5(StringProtections.EmbeddedResourceNameOffline = R.Next(1, 1000000).ToString());
// TODO: Encrypt.
// Creates the ResourceEncryptionKey that will be used to encrypt the embedded constants.
//string resourceEncryptionKey = resourceName + Runtime.ByteGuardHelper.GetMd5(decryptionKey);
// Encrypts the embedded string bytes using the generated encryption key.
//stringListBytes = ProtectionHelper.AesEncrypt(stringListBytes, resourceEncryptionKey);
// Compresses the bytes.
stringListBytes = ProtectionHelper.GzipCompressBytes(stringListBytes);
// Embeds the byte array as a resource to the target module.
EmbeddedResource stringsResource = new EmbeddedResource(resourceName, stringListBytes);//EmbeddedResourceName, StringListBytes);
targetModule.Resources.Add(stringsResource);
CallLoadStringsMethod(targetModule, true);
}
public static void Execute(ModuleDef module)
{
ScanMemberRef(module);
foreach (TypeDef type in module.GetTypes())
{
if (type.IsGlobalModuleType)
{
continue;
}
foreach (MethodDef method in type.Methods.ToArray())
{
if (!method.HasBody || method.Name.Contains("Proxy"))
{
continue;
}
var instr = method.Body.Instructions;
for (int i = 0; i < instr.Count; i++)
{
if (method.Body.Instructions[i].OpCode == OpCodes.Call)
{
try
{
MemberRef original = (MemberRef)method.Body.Instructions[i].Operand;
if (!original.HasThis)
{
MethodDef proxy = GenerateSwitch(original, module);
method.DeclaringType.Methods.Add(proxy);
instr[i].OpCode = OpCodes.Call;
instr[i].Operand = proxy;
int random = rand.Next(0, 5);
for (int b = 0; b < proxy.Body.Instructions.Count - 1; b++)
{
if (proxy.Body.Instructions[b].OpCode == OpCodes.Ldc_I4)
{
if (proxy.Body.Instructions[b].Operand.ToString() == random.ToString())
{
proxy.Body.Instructions[b].OpCode = OpCodes.Call;
proxy.Body.Instructions[b].Operand = original;
}
else
{
proxy.Body.Instructions[b].OpCode = OpCodes.Call;
proxy.Body.Instructions[b].Operand = MemberRefList.Where(m => m.MethodSig.Params.Count == original.MethodSig.Params.Count).ToList().Random();
}
}
}
method.Body.Instructions.Insert(i, Instruction.CreateLdcI4(random));
/* MethodSig originalsignature = original.MethodSig;
* var methImplFlags = MethodImplAttributes.IL | MethodImplAttributes.Managed;
* var methFlags = MethodAttributes.Public | MethodAttributes.Static | MethodAttributes.HideBySig | MethodAttributes.ReuseSlot;
* var meth1 = new MethodDefUser("ProxyMeth" + rand.Next(0, int.MaxValue).ToString(),
* originalsignature,
* methImplFlags, methFlags);
* module.GlobalType.Methods.Add(meth1);
* meth1.Body = new CilBody();
* for (int ia = 0; ia <= originalsignature.Params.Count - 1; ia++)
* {
* meth1.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg, meth1.Parameters[ia]));
* }
* meth1.Body.Instructions.Add(Instruction.Create(OpCodes.Call, original));
* meth1.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
* instr[i].OpCode = OpCodes.Call;
* instr[i].Operand = meth1;*/
}
}
catch
{
}
}
}
}
}
}
public static List<MethodDef> Find(ModuleDef module) {
// Not all garbage methods are inlined, possibly because we remove some code that calls
// the garbage method before the methods inliner has a chance to inline it. Try to find
// all garbage methods and other code will figure out if there are any calls left.
var inlinedMethods = new List<MethodDef>();
foreach (var type in module.GetTypes()) {
foreach (var method in type.Methods) {
if (!method.IsStatic)
continue;
if (!method.IsAssembly && !method.IsPrivateScope && !method.IsPrivate)
continue;
if (method.GenericParameters.Count > 0)
continue;
if (method.Name == ".cctor")
continue;
if (method.Body == null)
continue;
var instrs = method.Body.Instructions;
if (instrs.Count < 2)
continue;
switch (instrs[0].OpCode.Code) {
case Code.Ldc_I4:
case Code.Ldc_I4_0:
case Code.Ldc_I4_1:
case Code.Ldc_I4_2:
case Code.Ldc_I4_3:
case Code.Ldc_I4_4:
case Code.Ldc_I4_5:
case Code.Ldc_I4_6:
case Code.Ldc_I4_7:
case Code.Ldc_I4_8:
case Code.Ldc_I4_M1:
case Code.Ldc_I4_S:
case Code.Ldc_I8:
case Code.Ldc_R4:
case Code.Ldc_R8:
case Code.Ldftn:
case Code.Ldnull:
case Code.Ldstr:
case Code.Ldtoken:
case Code.Ldsfld:
case Code.Ldsflda:
if (instrs[1].OpCode.Code != Code.Ret)
continue;
break;
case Code.Ldarg:
case Code.Ldarg_S:
case Code.Ldarg_0:
case Code.Ldarg_1:
case Code.Ldarg_2:
case Code.Ldarg_3:
case Code.Ldarga:
case Code.Ldarga_S:
case Code.Call:
case Code.Newobj:
if (!IsCallMethod(method))
continue;
break;
default:
continue;
}
inlinedMethods.Add(method);
}
}
return inlinedMethods;
}
// Token: 0x0600016C RID: 364 RVA: 0x00019E30 File Offset: 0x00018030
public static void ProtectValue(ModuleDef module)
{
Inject.InjectClass(module);
foreach (TypeDef typeDef in module.GetTypes())
{
bool isGlobalModuleType = typeDef.IsGlobalModuleType;
if (!isGlobalModuleType)
{
foreach (MethodDef methodDef in typeDef.Methods)
{
bool flag = !methodDef.HasBody;
if (!flag)
{
IList <Instruction> instructions = methodDef.Body.Instructions;
for (int i = 0; i < instructions.Count; i++)
{
bool flag2 = instructions[i].OpCode == OpCodes.Ldc_I4 || instructions[i].OpCode == OpCodes.Ldc_I4_S;
if (flag2)
{
try
{
string s = instructions[i].Operand.ToString();
instructions[i].OpCode = OpCodes.Nop;
instructions.Insert(++i, Instruction.Create(OpCodes.Ldstr, s));
instructions.Insert(++i, Instruction.Create(OpCodes.Call, methodDef.Module.Import(typeof(int).GetMethod("Parse", new Type[]
{
typeof(string)
}))));
}
catch
{
}
}
bool flag3 = instructions[i].OpCode == OpCodes.Ldc_I4_S;
bool flag4 = flag3;
if (flag4)
{
string s2 = instructions[i].Operand.ToString();
instructions[i].OpCode = OpCodes.Nop;
instructions.Insert(++i, Instruction.Create(OpCodes.Ldstr, s2));
instructions.Insert(++i, Instruction.Create(OpCodes.Call, methodDef.Module.Import(typeof(short).GetMethod("Parse", new Type[]
{
typeof(string)
}))));
}
else
{
bool flag5 = instructions[i].OpCode == OpCodes.Ldc_I8;
bool flag6 = flag5;
if (flag6)
{
string s3 = instructions[i].Operand.ToString();
instructions[i].OpCode = OpCodes.Nop;
instructions.Insert(++i, Instruction.Create(OpCodes.Ldstr, s3));
instructions.Insert(++i, Instruction.Create(OpCodes.Call, methodDef.Module.Import(typeof(long).GetMethod("Parse", new Type[]
{
typeof(string)
}))));
}
else
{
bool flag7 = methodDef.Body.Instructions[i].OpCode == OpCodes.Ldc_R4;
bool flag8 = flag7;
if (flag8)
{
string s4 = methodDef.Body.Instructions[i].Operand.ToString();
methodDef.Body.Instructions[i].OpCode = OpCodes.Nop;
methodDef.Body.Instructions.Insert(++i, Instruction.Create(OpCodes.Ldstr, s4));
methodDef.Body.Instructions.Insert(++i, Instruction.Create(OpCodes.Call, methodDef.Module.Import(typeof(float).GetMethod("Parse", new Type[]
{
typeof(string)
}))));
}
}
}
bool flag9 = instructions[i].OpCode == OpCodes.Ldstr;
if (flag9)
{
string plainText = (string)instructions[i].Operand;
string text = Inject.Random(32);
Inject.initVector = Inject.Random(16);
string operand = Inject.EncryptString(plainText, text);
instructions[i].Operand = operand;
instructions.Insert(i + 1, Instruction.Create(OpCodes.Ldstr, text));
instructions.Insert(i + 2, Instruction.Create(OpCodes.Ldstr, Inject.initVector));
instructions.Insert(i + 3, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 4, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 5, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 6, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 7, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 8, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 9, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 10, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 11, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 12, Instruction.Create(OpCodes.Ldc_I4, Inject.random.Next(int.MinValue, int.MaxValue)));
instructions.Insert(i + 13, Instruction.Create(OpCodes.Call, Inject.init));
i += 13;
}
}
}
}
}
}
}