Support Eazfuscator.NET 3.5 string encrypter
This commit is contained in:
parent
b8430ea2e3
commit
245d875d5f
|
@ -153,6 +153,7 @@
|
|||
<Compile Include="deobfuscators\DeobUtils.cs" />
|
||||
<Compile Include="deobfuscators\Dotfuscator\Deobfuscator.cs" />
|
||||
<Compile Include="deobfuscators\Dotfuscator\StringDecrypter.cs" />
|
||||
<Compile Include="deobfuscators\Eazfuscator_NET\Dynocode.cs" />
|
||||
<Compile Include="deobfuscators\MyPEImage.cs" />
|
||||
<Compile Include="deobfuscators\dotNET_Reactor\v3\AntiStrongName.cs" />
|
||||
<Compile Include="deobfuscators\dotNET_Reactor\v3\ApplicationModeDecrypter.cs" />
|
||||
|
|
|
@ -156,6 +156,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
|
|||
if (CanRemoveStringDecrypterType) {
|
||||
addTypesToBeRemoved(stringDecrypter.Types, "String decrypter type");
|
||||
addTypeToBeRemoved(decrypterType.Type, "Decrypter type");
|
||||
addTypesToBeRemoved(stringDecrypter.DynocodeTypes, "Dynocode type");
|
||||
addResourceToBeRemoved(stringDecrypter.Resource, "Encrypted strings");
|
||||
}
|
||||
addTypeToBeRemoved(assemblyResolver.Type, "Assembly resolver type");
|
||||
|
|
286
de4dot.code/deobfuscators/Eazfuscator_NET/Dynocode.cs
Normal file
286
de4dot.code/deobfuscators/Eazfuscator_NET/Dynocode.cs
Normal file
|
@ -0,0 +1,286 @@
|
|||
/*
|
||||
Copyright (C) 2011-2012 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 dot10.DotNet;
|
||||
using dot10.DotNet.Emit;
|
||||
using de4dot.blocks;
|
||||
|
||||
namespace de4dot.code.deobfuscators.Eazfuscator_NET {
|
||||
interface IDynocodeGenerator {
|
||||
IEnumerable<int> getValues(int input);
|
||||
}
|
||||
|
||||
// Something added in EF 3.5 which they call Dynocode. The string decrypter can now
|
||||
// call some iterator classes that will return some integers that it will use to
|
||||
// XOR some key.
|
||||
class Dynocode {
|
||||
ISimpleDeobfuscator simpleDeobfuscator;
|
||||
Dictionary<TypeDef, IDynocodeGenerator> typeToDCGen = new Dictionary<TypeDef, IDynocodeGenerator>();
|
||||
|
||||
class DCGen1 : IDynocodeGenerator {
|
||||
public int magic1;
|
||||
public int magic2;
|
||||
public int magic3;
|
||||
public int magic4;
|
||||
public int magic5;
|
||||
public int magic6;
|
||||
public int magic7;
|
||||
|
||||
public IEnumerable<int> getValues(int input) {
|
||||
yield return magic1;
|
||||
yield return magic2;
|
||||
yield return input ^ magic3;
|
||||
yield return magic4;
|
||||
yield return magic5;
|
||||
yield return magic6;
|
||||
yield return input ^ magic7;
|
||||
}
|
||||
}
|
||||
|
||||
class DCGen2 : IDynocodeGenerator {
|
||||
public int magic1;
|
||||
|
||||
public IEnumerable<int> getValues(int input) {
|
||||
int x = 0;
|
||||
int y = 1;
|
||||
while (true) {
|
||||
yield return y;
|
||||
if (--input == 0)
|
||||
break;
|
||||
int tmp = y;
|
||||
y = (x + y + input) ^ magic1;
|
||||
x = tmp;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
class DCGen3 : IDynocodeGenerator {
|
||||
public int magic1;
|
||||
public int magic2;
|
||||
public DCGen2 dc2;
|
||||
|
||||
public IEnumerable<int> getValues(int input) {
|
||||
int i = 7;
|
||||
foreach (var val in dc2.getValues(input)) {
|
||||
int x = val ^ input;
|
||||
if ((x % 4) == 0)
|
||||
x ^= magic1;
|
||||
if ((x % 16) == 0)
|
||||
x ^= magic2;
|
||||
yield return x;
|
||||
if (--i == 0)
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public IEnumerable<TypeDef> Types {
|
||||
get { return typeToDCGen.Keys; }
|
||||
}
|
||||
|
||||
public Dynocode(ISimpleDeobfuscator simpleDeobfuscator) {
|
||||
this.simpleDeobfuscator = simpleDeobfuscator;
|
||||
}
|
||||
|
||||
public IDynocodeGenerator getDynocodeGenerator(TypeDef type) {
|
||||
if (type == null)
|
||||
return null;
|
||||
var dt = type.DeclaringType;
|
||||
if (dt == null)
|
||||
return null;
|
||||
IDynocodeGenerator dcGen;
|
||||
if (typeToDCGen.TryGetValue(type, out dcGen))
|
||||
return dcGen;
|
||||
|
||||
if (dt.NestedTypes.Count == 1)
|
||||
dcGen = getDCGen1(type);
|
||||
else if (dt.NestedTypes.Count == 2)
|
||||
dcGen = getDCGen3(type);
|
||||
|
||||
typeToDCGen[type] = dcGen;
|
||||
|
||||
return dcGen;
|
||||
}
|
||||
|
||||
DCGen1 getDCGen1(TypeDef type) {
|
||||
var method = getMoveNext(type);
|
||||
if (method == null)
|
||||
return null;
|
||||
simpleDeobfuscator.deobfuscate(method);
|
||||
var swLabels = getSwitchLabels(method);
|
||||
if (swLabels == null || swLabels.Count < 7)
|
||||
return null;
|
||||
|
||||
var dcGen = new DCGen1();
|
||||
if (!getMagicDC1(method, swLabels[0], out dcGen.magic1))
|
||||
return null;
|
||||
if (!getMagicDC1(method, swLabels[1], out dcGen.magic2))
|
||||
return null;
|
||||
if (!getMagicXorDC1(method, swLabels[2], out dcGen.magic3))
|
||||
return null;
|
||||
if (!getMagicDC1(method, swLabels[3], out dcGen.magic4))
|
||||
return null;
|
||||
if (!getMagicDC1(method, swLabels[4], out dcGen.magic5))
|
||||
return null;
|
||||
if (!getMagicDC1(method, swLabels[5], out dcGen.magic6))
|
||||
return null;
|
||||
if (!getMagicXorDC1(method, swLabels[6], out dcGen.magic7))
|
||||
return null;
|
||||
|
||||
return dcGen;
|
||||
}
|
||||
|
||||
static IList<Instruction> getSwitchLabels(MethodDef method) {
|
||||
foreach (var instr in method.Body.Instructions) {
|
||||
if (instr.OpCode.Code != Code.Switch)
|
||||
continue;
|
||||
return instr.Operand as IList<Instruction>;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
static bool getMagicDC1(MethodDef method, Instruction target, out int magic) {
|
||||
magic = 0;
|
||||
var instrs = method.Body.Instructions;
|
||||
int index = instrs.IndexOf(target);
|
||||
if (index < 0)
|
||||
return false;
|
||||
|
||||
for (int i = index; i < instrs.Count - 3; i++) {
|
||||
var instr = instrs[i];
|
||||
if (instr.OpCode.FlowControl != FlowControl.Next)
|
||||
return false;
|
||||
if (instr.OpCode.Code != Code.Stfld)
|
||||
continue;
|
||||
if (instrs[i + 1].OpCode.Code != Code.Ldarg_0)
|
||||
continue;
|
||||
var ldci4 = instrs[i + 2];
|
||||
if (!ldci4.IsLdcI4())
|
||||
continue;
|
||||
if (instrs[i + 3].OpCode.Code != Code.Stfld)
|
||||
continue;
|
||||
|
||||
magic = ldci4.GetLdcI4Value();
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static bool getMagicXorDC1(MethodDef method, Instruction target, out int magic) {
|
||||
magic = 0;
|
||||
var instrs = method.Body.Instructions;
|
||||
int index = instrs.IndexOf(target);
|
||||
if (index < 0)
|
||||
return false;
|
||||
|
||||
for (int i = index; i < instrs.Count - 2; i++) {
|
||||
var instr = instrs[i];
|
||||
if (instr.OpCode.FlowControl != FlowControl.Next)
|
||||
return false;
|
||||
if (!instr.IsLdcI4())
|
||||
continue;
|
||||
if (instrs[i + 1].OpCode.Code != Code.Xor)
|
||||
continue;
|
||||
if (instrs[i + 2].OpCode.Code != Code.Stfld)
|
||||
continue;
|
||||
|
||||
magic = instr.GetLdcI4Value();
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
DCGen3 getDCGen3(TypeDef type) {
|
||||
var method = getMoveNext(type);
|
||||
if (method == null)
|
||||
return null;
|
||||
simpleDeobfuscator.deobfuscate(method);
|
||||
|
||||
var dcGen = new DCGen3();
|
||||
int index = 0;
|
||||
if (!getMagicDC3(method, ref index, out dcGen.magic1))
|
||||
return null;
|
||||
if (!getMagicDC3(method, ref index, out dcGen.magic2))
|
||||
return null;
|
||||
|
||||
var dt = type.DeclaringType;
|
||||
dcGen.dc2 = getDCGen2(dt.NestedTypes[0] == type ? dt.NestedTypes[1] : dt.NestedTypes[0]);
|
||||
|
||||
return dcGen;
|
||||
}
|
||||
|
||||
static bool getMagicDC3(MethodDef method, ref int index, out int magic) {
|
||||
var instrs = method.Body.Instructions;
|
||||
for (int i = index; i < instrs.Count - 2; i++) {
|
||||
var ldci4 = instrs[i];
|
||||
if (!ldci4.IsLdcI4())
|
||||
continue;
|
||||
if (instrs[i + 1].OpCode.Code != Code.Xor)
|
||||
continue;
|
||||
if (instrs[i + 2].OpCode.Code != Code.Stfld)
|
||||
continue;
|
||||
|
||||
index = i + 3;
|
||||
magic = ldci4.GetLdcI4Value();
|
||||
return true;
|
||||
}
|
||||
|
||||
magic = 0;
|
||||
return false;
|
||||
}
|
||||
|
||||
DCGen2 getDCGen2(TypeDef type) {
|
||||
var method = getMoveNext(type);
|
||||
if (method == null)
|
||||
return null;
|
||||
simpleDeobfuscator.deobfuscate(method);
|
||||
|
||||
var dcGen = new DCGen2();
|
||||
int index = 0;
|
||||
if (!getMagicDC3(method, ref index, out dcGen.magic1))
|
||||
return null;
|
||||
|
||||
return dcGen;
|
||||
}
|
||||
|
||||
static MethodDef getMoveNext(TypeDef type) {
|
||||
foreach (var m in type.Methods) {
|
||||
if (!m.IsVirtual)
|
||||
continue;
|
||||
foreach (var mo in m.Overrides) {
|
||||
if (mo.MethodDeclaration.FullName == "System.Boolean System.Collections.IEnumerator::MoveNext()")
|
||||
return m;
|
||||
}
|
||||
}
|
||||
foreach (var m in type.Methods) {
|
||||
if (!m.IsVirtual)
|
||||
continue;
|
||||
if (m.Name != "MoveNext")
|
||||
continue;
|
||||
if (!DotNetUtils.isMethod(m, "System.Boolean", "()"))
|
||||
continue;
|
||||
return m;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
}
|
||||
}
|
|
@ -47,6 +47,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
|
|||
EfConstantsReader stringMethodConsts;
|
||||
bool isV32OrLater;
|
||||
int? validStringDecrypterValue;
|
||||
Dynocode dynocode;
|
||||
|
||||
class StreamHelperType {
|
||||
public TypeDef type;
|
||||
|
@ -99,6 +100,10 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
|
|||
}
|
||||
}
|
||||
|
||||
public IEnumerable<TypeDef> DynocodeTypes {
|
||||
get { return dynocode.Types; }
|
||||
}
|
||||
|
||||
public MethodDef Method {
|
||||
get { return stringMethod; }
|
||||
}
|
||||
|
@ -223,6 +228,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
|
|||
}
|
||||
|
||||
bool findConstants(ISimpleDeobfuscator simpleDeobfuscator) {
|
||||
dynocode = new Dynocode(simpleDeobfuscator);
|
||||
simpleDeobfuscator.deobfuscate(stringMethod);
|
||||
stringMethodConsts = new EfConstantsReader(stringMethod);
|
||||
|
||||
|
@ -630,6 +636,11 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
|
|||
emu.push(new Int64Value((long)decrypterType.getMagic()));
|
||||
break;
|
||||
|
||||
case Code.Newobj:
|
||||
if (!emulateDynocode(emu, ref i))
|
||||
goto default;
|
||||
break;
|
||||
|
||||
default:
|
||||
if (instr.OpCode.FlowControl != FlowControl.Next)
|
||||
goto done;
|
||||
|
@ -649,6 +660,72 @@ done: ;
|
|||
return false;
|
||||
}
|
||||
|
||||
bool emulateDynocode(InstructionEmulator emu, ref int index) {
|
||||
var instrs = stringMethod.Body.Instructions;
|
||||
var instr = instrs[index];
|
||||
|
||||
var ctor = instr.Operand as MethodDef;
|
||||
if (ctor == null || ctor.MethodSig.GetParamCount() != 1 || ctor.MethodSig.Params[0].ElementType != ElementType.I4)
|
||||
return false;
|
||||
|
||||
if (index + 4 >= instrs.Count)
|
||||
return false;
|
||||
var ldloc = instrs[index + 3];
|
||||
if (!ldloc.IsLdloc() || instrs[index + 4].OpCode.Code != Code.Stfld)
|
||||
return false;
|
||||
|
||||
var initValue = emu.getLocal(ldloc.GetLocal(stringMethod.Body.Variables)) as Int32Value;
|
||||
if (initValue == null || !initValue.allBitsValid())
|
||||
return false;
|
||||
|
||||
int leaveIndex = findLeave(instrs, index);
|
||||
if (leaveIndex < 0)
|
||||
return false;
|
||||
var afterLoop = instrs[leaveIndex].Operand as Instruction;
|
||||
if (afterLoop == null)
|
||||
return false;
|
||||
int newIndex = instrs.IndexOf(afterLoop);
|
||||
var loopLocal = getDCLoopLocal(index, newIndex);
|
||||
if (loopLocal == null)
|
||||
return false;
|
||||
var initValue2 = emu.getLocal(loopLocal) as Int32Value;
|
||||
if (initValue2 == null || !initValue2.allBitsValid())
|
||||
return false;
|
||||
|
||||
var dcGen = dynocode.getDynocodeGenerator(ctor.DeclaringType);
|
||||
if (dcGen == null)
|
||||
return false;
|
||||
int loopLocalValue = initValue2.value;
|
||||
foreach (var val in dcGen.getValues(initValue.value))
|
||||
loopLocalValue ^= val;
|
||||
|
||||
emu.setLocal(loopLocal, new Int32Value(loopLocalValue));
|
||||
emu.emulate(instr);
|
||||
index = newIndex - 1;
|
||||
return true;
|
||||
}
|
||||
|
||||
Local getDCLoopLocal(int start, int end) {
|
||||
var instrs = stringMethod.Body.Instructions;
|
||||
for (int i = start; i < end - 1; i++) {
|
||||
if (instrs[i].OpCode.Code != Code.Xor)
|
||||
continue;
|
||||
var stloc = instrs[i + 1];
|
||||
if (!stloc.IsStloc())
|
||||
continue;
|
||||
return stloc.GetLocal(stringMethod.Body.Variables);
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
static int findLeave(IList<Instruction> instrs, int index) {
|
||||
for (int i = index; i < instrs.Count; i++) {
|
||||
if (instrs[i].OpCode.Code == Code.Leave_S || instrs[i].OpCode.Code == Code.Leave)
|
||||
return i;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
static int findInitIntsIndex(MethodDef method, out bool initializedAll) {
|
||||
initializedAll = false;
|
||||
|
||||
|
|
Loading…
Reference in New Issue
Block a user