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Add an option to remove a present unbox.any instr

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de4dot 2012-08-01 22:18:47 +02:00
parent b7715433bf
commit e496cea7da
1 changed files with 27 additions and 0 deletions
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27
de4dot.code/deobfuscators/ValueInlinerBase.cs
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@ -26,6 +26,7 @@ using de4dot.blocks;
namespace de4dot.code.deobfuscators {
abstract class ValueInlinerBase<TValue> : MethodReturnValueInliner {
MethodDefinitionAndDeclaringTypeDict<Func<MethodDefinition, GenericInstanceMethod, object[], object>> decrypterMethods = new MethodDefinitionAndDeclaringTypeDict<Func<MethodDefinition, GenericInstanceMethod, object[], object>>();
bool removeUnbox = false;
class MyCallResult : CallResult {
public MethodReference methodReference;
@ -37,6 +38,11 @@ namespace de4dot.code.deobfuscators {
}
}
public bool RemoveUnbox {
get { return removeUnbox; }
set { removeUnbox = value; }
}
public override bool HasHandlers {
get { return decrypterMethods.Count != 0; }
}
@ -67,6 +73,22 @@ namespace de4dot.code.deobfuscators {
return null;
return new MyCallResult(block, callInstrIndex, method, gim);
}
protected bool removeUnboxInstruction(Block block, int index, string unboxType) {
if (!removeUnbox)
return false;
var instrs = block.Instructions;
if (index >= instrs.Count)
return false;
var unbox = instrs[index];
if (unbox.OpCode.Code != Code.Unbox_Any)
return false;
var type = unbox.Operand as TypeReference;
if (type == null || type.FullName != unboxType)
return false;
block.remove(index, 1);
return true;
}
}
class BooleanValueInliner : ValueInlinerBase<bool> {
@ -76,6 +98,7 @@ namespace de4dot.code.deobfuscators {
int num = callResult.callEndIndex - callResult.callStartIndex + 1;
block.replace(callResult.callStartIndex, num, DotNetUtils.createLdci4((bool)callResult.returnValue ? 1 : 0));
removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Boolean");
Log.v("Decrypted boolean: {0}", callResult.returnValue);
}
}
@ -88,6 +111,7 @@ namespace de4dot.code.deobfuscators {
int num = callResult.callEndIndex - callResult.callStartIndex + 1;
block.replace(callResult.callStartIndex, num, DotNetUtils.createLdci4((int)callResult.returnValue));
removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Int32");
Log.v("Decrypted int32: {0}", callResult.returnValue);
}
}
@ -100,6 +124,7 @@ namespace de4dot.code.deobfuscators {
int num = callResult.callEndIndex - callResult.callStartIndex + 1;
block.replace(callResult.callStartIndex, num, Instruction.Create(OpCodes.Ldc_I8, (long)callResult.returnValue));
removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Int64");
Log.v("Decrypted int64: {0}", callResult.returnValue);
}
}
@ -112,6 +137,7 @@ namespace de4dot.code.deobfuscators {
int num = callResult.callEndIndex - callResult.callStartIndex + 1;
block.replace(callResult.callStartIndex, num, Instruction.Create(OpCodes.Ldc_R4, (float)callResult.returnValue));
removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Single");
Log.v("Decrypted single: {0}", callResult.returnValue);
}
}
@ -124,6 +150,7 @@ namespace de4dot.code.deobfuscators {
int num = callResult.callEndIndex - callResult.callStartIndex + 1;
block.replace(callResult.callStartIndex, num, Instruction.Create(OpCodes.Ldc_R8, (double)callResult.returnValue));
removeUnboxInstruction(block, callResult.callStartIndex + 1, "System.Double");
Log.v("Decrypted double: {0}", callResult.returnValue);
}
}