monocul.us/de4dot-cex
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add CflowDeobfuscator

Browse Source
This commit is contained in:
de4dot 2011-12-20 20:11:05 +01:00
parent bc5d829714
commit c65b76583c
5 changed files with 104 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
blocks/blocks.csproj
View File

@ -38,9 +38,11 @@
<Compile Include="Blocks.cs" />
<Compile Include="BlocksSorter.cs" />
<Compile Include="cflow\BlockCflowDeobfuscator.cs" />
<Compile Include="cflow\CflowDeobfuscator.cs" />
<Compile Include="cflow\CflowUtils.cs" />
<Compile Include="cflow\DeadCodeRemover.cs" />
<Compile Include="cflow\DeadStoreRemover.cs" />
<Compile Include="cflow\ICflowDeobfuscator.cs" />
<Compile Include="cflow\InstructionEmulator.cs" />
<Compile Include="cflow\Int32Value.cs" />
<Compile Include="cflow\Int64Value.cs" />

3
blocks/cflow/BlocksCflowDeobfuscator.cs
View File

@ -33,6 +33,7 @@ namespace de4dot.blocks.cflow {
MethodCallInliner methodCallInliner = new MethodCallInliner();
public bool InlineMethods { get; set; }
public bool InlineInstanceMethods { get; set; }
public void init(Blocks blocks) {
this.blocks = blocks;
@ -54,7 +55,7 @@ namespace de4dot.blocks.cflow {
if (InlineMethods) {
foreach (var block in allBlocks) {
methodCallInliner.init(blocks, block);
methodCallInliner.init(blocks, block, InlineInstanceMethods);
changed |= methodCallInliner.deobfuscate();
}
}

62
blocks/cflow/CflowDeobfuscator.cs Normal file
View File

@ -0,0 +1,62 @@
/*
Copyright (C) 2011 de4dot@gmail.com
This file is part of de4dot.
de4dot is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
de4dot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
*/
using System.Collections.Generic;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace de4dot.blocks.cflow {
public class CflowDeobfuscator : ICflowDeobfuscator {
BlocksCflowDeobfuscator cflowDeobfuscator = new BlocksCflowDeobfuscator();
public bool InlineMethods { get; set; }
public bool InlineInstanceMethods { get; set; }
public CflowDeobfuscator() {
InlineMethods = true;
InlineInstanceMethods = false;
}
public void deobfuscateCflow(MethodDefinition method) {
deobfuscate(method, (blocks) => {
cflowDeobfuscator.InlineMethods = InlineMethods;
cflowDeobfuscator.InlineInstanceMethods = InlineInstanceMethods;
cflowDeobfuscator.init(blocks);
cflowDeobfuscator.deobfuscate();
});
}
static bool hasNonEmptyBody(MethodDefinition method) {
return method.Body != null && method.Body.Instructions.Count > 0;
}
void deobfuscate(MethodDefinition method, Action<Blocks> handler) {
if (hasNonEmptyBody(method)) {
var blocks = new Blocks(method);
handler(blocks);
IList<Instruction> allInstructions;
IList<ExceptionHandler> allExceptionHandlers;
blocks.getCode(out allInstructions, out allExceptionHandlers);
DotNetUtils.restoreBody(method, allInstructions, allExceptionHandlers);
}
}
}
}

26
blocks/cflow/ICflowDeobfuscator.cs Normal file
View File

@ -0,0 +1,26 @@
/*
Copyright (C) 2011 de4dot@gmail.com
This file is part of de4dot.
de4dot is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
de4dot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
*/
using Mono.Cecil;
namespace de4dot.blocks.cflow {
public interface ICflowDeobfuscator {
void deobfuscateCflow(MethodDefinition method);
}
}

14
blocks/cflow/MethodCallInliner.cs
View File

@ -29,11 +29,13 @@ namespace de4dot.blocks.cflow {
Blocks blocks;
Block block;
int iteration;
bool inlineInstanceMethods;
public void init(Blocks blocks, Block block) {
public void init(Blocks blocks, Block block, bool inlineInstanceMethods) {
this.blocks = blocks;
this.block = block;
this.iteration = 0;
this.inlineInstanceMethods = inlineInstanceMethods;
}
public bool deobfuscate() {
@ -50,6 +52,14 @@ namespace de4dot.blocks.cflow {
return changed;
}
bool canInline(MethodDefinition method) {
if (method.IsStatic)
return true;
if (method.IsVirtual)
return false;
return inlineInstanceMethods;
}
bool inlineMethod(Instruction callInstr, int instrIndex) {
var method = callInstr.Operand as MethodDefinition;
if (method == null)
@ -57,7 +67,7 @@ namespace de4dot.blocks.cflow {
if (MemberReferenceHelper.compareMethodReferenceAndDeclaringType(method, blocks.Method))
return false;
if (!method.IsStatic)
if (!canInline(method))
return false;
var body = method.Body;
if (body == null)