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Support latest EF 3.3.143

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This commit is contained in:
de4dot 2012-03-23 10:13:59 +01:00
parent 8ca040f0da
commit efd317489d
2 changed files with 64 additions and 51 deletions
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113
de4dot.code/deobfuscators/Eazfuscator_NET/DecrypterType.cs
View File

@ -26,13 +26,14 @@ using de4dot.blocks;
namespace de4dot.code.deobfuscators.Eazfuscator_NET {
class DecrypterType {
ModuleDefinition module;
TypeDefinition type;
MethodDefinition int64Method;
bool initialized;
ulong l1;
int i1, i2, i3;
int m1_i1, m2_i1, m2_i2, m3_i1;
int token1, token2, token3, token4, token5, token6;
MethodDefinition[] efConstMethods;
public TypeDefinition Type {
get { return type; }
@ -48,6 +49,10 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
get { return type != null; }
}
public DecrypterType(ModuleDefinition module) {
this.module = module;
}
public bool initialize() {
if (initialized)
return true;
@ -56,27 +61,66 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
if (int64Method == null)
return false;
if (!initializeEfConstMethods())
return false;
if (!findInt1And2())
return false;
if (!findInt3())
return false;
if (!findMethodInts())
return false;
token1 = getToken(-1509110933);
token2 = getToken(-82806859);
token3 = getToken(1294352278);
token4 = getToken(402344241);
token5 = getToken(-56237163);
token6 = getToken(1106695601);
if (token1 == 0 || token2 == 0 || token3 == 0)
return false;
if (token4 == 0 || token5 == 0 || token6 == 0)
return false;
initialized = true;
return true;
}
bool initializeEfConstMethods() {
if (type == null)
return false;
foreach (var instr in int64Method.Body.Instructions) {
if (instr.OpCode.Code != Code.Call)
continue;
var calledMethod = instr.Operand as MethodDefinition;
if (calledMethod == null || !calledMethod.IsStatic || calledMethod.Body == null)
continue;
if (!DotNetUtils.isMethod(calledMethod, "System.Int32", "()"))
continue;
int index = type.NestedTypes.IndexOf(calledMethod.DeclaringType);
if (index < 0)
continue;
if (!initializeEfConstMethods(index))
continue;
return true;
}
return false;
}
bool initializeEfConstMethods(int index) {
efConstMethods = new MethodDefinition[6];
for (int i = 0; i < efConstMethods.Length; i++) {
var constMethod = getEfConstMethod(type.NestedTypes[index++]);
if (constMethod == null)
return false;
efConstMethods[i] = constMethod;
}
return true;
}
MethodDefinition getEfConstMethod(TypeDefinition nestedType) {
foreach (var method in nestedType.Methods) {
if (!method.IsStatic || method.Body == null)
continue;
if (!DotNetUtils.isMethod(method, "System.Int32", "()"))
continue;
return method;
}
return null;
}
MethodDefinition findInt64Method() {
if (type == null)
return null;
@ -111,7 +155,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
}
bool findInt1And2() {
var consts = getConstants(findNestedTypeMethod(1294352278));
var consts = getConstants(efConstMethods[2]);
if (consts.Count != 2)
return false;
i1 = consts[0];
@ -120,7 +164,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
}
bool findInt3() {
var consts = getConstants(findNestedTypeMethod(1106695601));
var consts = getConstants(efConstMethods[5]);
if (consts.Count != 1)
return false;
i3 = consts[0];
@ -227,36 +271,6 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
return list;
}
MethodDefinition findNestedTypeMethod(int constant) {
foreach (var nestedType in type.NestedTypes) {
foreach (var method in nestedType.Methods) {
if (!method.IsStatic || method.Body == null)
continue;
var instrs = method.Body.Instructions;
for (int i = 0; i < instrs.Count - 1; i++) {
var ldci4 = instrs[i];
if (!DotNetUtils.isLdcI4(ldci4))
continue;
if (DotNetUtils.getLdcI4Value(ldci4) != constant)
continue;
if (instrs[i + 1].OpCode.Code != Code.Ret)
continue;
return method;
}
}
}
return null;
}
int getToken(int constant) {
var method = findNestedTypeMethod(constant);
if (method == null)
return 0;
return method.DeclaringType.MetadataToken.ToInt32();
}
int binOp1(int a, int b) {
return a ^ (b - m1_i1);
}
@ -270,33 +284,32 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
}
int constMethod1() {
return binOp3(binOp2(token2, binOp3(token1, token5)), constMethod6());
return binOp3(binOp2(efConstMethods[1].DeclaringType.MetadataToken.ToInt32(), binOp3(efConstMethods[0].DeclaringType.MetadataToken.ToInt32(), efConstMethods[4].DeclaringType.MetadataToken.ToInt32())), constMethod6());
}
int constMethod2() {
return binOp1(token3, token4 ^ binOp2(token2, binOp3(token6, constMethod4())));
return binOp1(efConstMethods[2].DeclaringType.MetadataToken.ToInt32(), efConstMethods[3].DeclaringType.MetadataToken.ToInt32() ^ binOp2(efConstMethods[1].DeclaringType.MetadataToken.ToInt32(), binOp3(efConstMethods[5].DeclaringType.MetadataToken.ToInt32(), constMethod4())));
}
int constMethod3() {
return binOp3(binOp1(constMethod2() ^ i1, token4), binOp2(token1 ^ token6, i2));
return binOp3(binOp1(constMethod2() ^ i1, efConstMethods[3].DeclaringType.MetadataToken.ToInt32()), binOp2(efConstMethods[0].DeclaringType.MetadataToken.ToInt32() ^ efConstMethods[5].DeclaringType.MetadataToken.ToInt32(), i2));
}
int constMethod4() {
return binOp3(token4, binOp1(token1, binOp2(token2, binOp3(token3, binOp1(token5, token6)))));
return binOp3(efConstMethods[3].DeclaringType.MetadataToken.ToInt32(), binOp1(efConstMethods[0].DeclaringType.MetadataToken.ToInt32(), binOp2(efConstMethods[1].DeclaringType.MetadataToken.ToInt32(), binOp3(efConstMethods[2].DeclaringType.MetadataToken.ToInt32(), binOp1(efConstMethods[4].DeclaringType.MetadataToken.ToInt32(), efConstMethods[5].DeclaringType.MetadataToken.ToInt32())))));
}
int constMethod5() {
return binOp2(binOp2(constMethod3(), binOp1(token5, constMethod2())), token6);
return binOp2(binOp2(constMethod3(), binOp1(efConstMethods[4].DeclaringType.MetadataToken.ToInt32(), constMethod2())), efConstMethods[5].DeclaringType.MetadataToken.ToInt32());
}
int constMethod6() {
return binOp1(token6, binOp3(binOp2(token5, token1), binOp3(token3 ^ i3, constMethod5())));
return binOp1(efConstMethods[5].DeclaringType.MetadataToken.ToInt32(), binOp3(binOp2(efConstMethods[4].DeclaringType.MetadataToken.ToInt32(), efConstMethods[0].DeclaringType.MetadataToken.ToInt32()), binOp3(efConstMethods[2].DeclaringType.MetadataToken.ToInt32() ^ i3, constMethod5())));
}
public ulong getMagic() {
if (type == null)
throw new ApplicationException("Can't calculate magic since type isn't initialized");
var module = type.Module;
var bytes = new List<byte>();
if (module.Assembly != null) {

2
de4dot.code/deobfuscators/Eazfuscator_NET/Deobfuscator.cs
View File

@ -91,7 +91,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
}
protected override void scanForObfuscator() {
decrypterType = new DecrypterType();
decrypterType = new DecrypterType(module);
stringDecrypter = new StringDecrypter(module, decrypterType);
stringDecrypter.find();
assemblyResolver = new AssemblyResolver(module, decrypterType);