Support latest EF 3.3.143
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@ -26,13 +26,14 @@ using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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class DecrypterType {
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ModuleDefinition module;
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TypeDefinition type;
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MethodDefinition int64Method;
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bool initialized;
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ulong l1;
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int i1, i2, i3;
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int m1_i1, m2_i1, m2_i2, m3_i1;
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int token1, token2, token3, token4, token5, token6;
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MethodDefinition[] efConstMethods;
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public TypeDefinition Type {
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get { return type; }
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@ -48,6 +49,10 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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get { return type != null; }
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}
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public DecrypterType(ModuleDefinition module) {
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this.module = module;
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}
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public bool initialize() {
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if (initialized)
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return true;
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@ -56,27 +61,66 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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if (int64Method == null)
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return false;
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if (!initializeEfConstMethods())
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return false;
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if (!findInt1And2())
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return false;
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if (!findInt3())
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return false;
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if (!findMethodInts())
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return false;
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token1 = getToken(-1509110933);
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token2 = getToken(-82806859);
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token3 = getToken(1294352278);
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token4 = getToken(402344241);
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token5 = getToken(-56237163);
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token6 = getToken(1106695601);
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if (token1 == 0 || token2 == 0 || token3 == 0)
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return false;
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if (token4 == 0 || token5 == 0 || token6 == 0)
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return false;
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initialized = true;
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return true;
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}
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bool initializeEfConstMethods() {
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if (type == null)
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return false;
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foreach (var instr in int64Method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Call)
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continue;
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var calledMethod = instr.Operand as MethodDefinition;
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if (calledMethod == null || !calledMethod.IsStatic || calledMethod.Body == null)
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continue;
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if (!DotNetUtils.isMethod(calledMethod, "System.Int32", "()"))
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continue;
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int index = type.NestedTypes.IndexOf(calledMethod.DeclaringType);
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if (index < 0)
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continue;
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if (!initializeEfConstMethods(index))
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continue;
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return true;
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}
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return false;
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}
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bool initializeEfConstMethods(int index) {
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efConstMethods = new MethodDefinition[6];
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for (int i = 0; i < efConstMethods.Length; i++) {
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var constMethod = getEfConstMethod(type.NestedTypes[index++]);
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if (constMethod == null)
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return false;
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efConstMethods[i] = constMethod;
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}
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return true;
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}
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MethodDefinition getEfConstMethod(TypeDefinition nestedType) {
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foreach (var method in nestedType.Methods) {
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if (!method.IsStatic || method.Body == null)
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continue;
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if (!DotNetUtils.isMethod(method, "System.Int32", "()"))
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continue;
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return method;
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}
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return null;
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}
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MethodDefinition findInt64Method() {
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if (type == null)
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return null;
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@ -111,7 +155,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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}
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bool findInt1And2() {
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var consts = getConstants(findNestedTypeMethod(1294352278));
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var consts = getConstants(efConstMethods[2]);
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if (consts.Count != 2)
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return false;
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i1 = consts[0];
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@ -120,7 +164,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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}
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bool findInt3() {
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var consts = getConstants(findNestedTypeMethod(1106695601));
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var consts = getConstants(efConstMethods[5]);
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if (consts.Count != 1)
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return false;
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i3 = consts[0];
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@ -227,36 +271,6 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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return list;
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}
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MethodDefinition findNestedTypeMethod(int constant) {
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foreach (var nestedType in type.NestedTypes) {
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foreach (var method in nestedType.Methods) {
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if (!method.IsStatic || method.Body == null)
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continue;
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count - 1; i++) {
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var ldci4 = instrs[i];
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if (!DotNetUtils.isLdcI4(ldci4))
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continue;
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if (DotNetUtils.getLdcI4Value(ldci4) != constant)
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continue;
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if (instrs[i + 1].OpCode.Code != Code.Ret)
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continue;
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return method;
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}
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}
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}
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return null;
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}
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int getToken(int constant) {
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var method = findNestedTypeMethod(constant);
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if (method == null)
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return 0;
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return method.DeclaringType.MetadataToken.ToInt32();
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}
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int binOp1(int a, int b) {
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return a ^ (b - m1_i1);
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}
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@ -270,33 +284,32 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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}
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int constMethod1() {
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return binOp3(binOp2(token2, binOp3(token1, token5)), constMethod6());
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return binOp3(binOp2(efConstMethods[1].DeclaringType.MetadataToken.ToInt32(), binOp3(efConstMethods[0].DeclaringType.MetadataToken.ToInt32(), efConstMethods[4].DeclaringType.MetadataToken.ToInt32())), constMethod6());
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}
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int constMethod2() {
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return binOp1(token3, token4 ^ binOp2(token2, binOp3(token6, constMethod4())));
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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())));
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}
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int constMethod3() {
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return binOp3(binOp1(constMethod2() ^ i1, token4), binOp2(token1 ^ token6, i2));
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return binOp3(binOp1(constMethod2() ^ i1, efConstMethods[3].DeclaringType.MetadataToken.ToInt32()), binOp2(efConstMethods[0].DeclaringType.MetadataToken.ToInt32() ^ efConstMethods[5].DeclaringType.MetadataToken.ToInt32(), i2));
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}
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int constMethod4() {
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return binOp3(token4, binOp1(token1, binOp2(token2, binOp3(token3, binOp1(token5, token6)))));
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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())))));
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}
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int constMethod5() {
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return binOp2(binOp2(constMethod3(), binOp1(token5, constMethod2())), token6);
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return binOp2(binOp2(constMethod3(), binOp1(efConstMethods[4].DeclaringType.MetadataToken.ToInt32(), constMethod2())), efConstMethods[5].DeclaringType.MetadataToken.ToInt32());
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}
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int constMethod6() {
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return binOp1(token6, binOp3(binOp2(token5, token1), binOp3(token3 ^ i3, constMethod5())));
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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())));
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}
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public ulong getMagic() {
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if (type == null)
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throw new ApplicationException("Can't calculate magic since type isn't initialized");
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var module = type.Module;
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var bytes = new List<byte>();
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if (module.Assembly != null) {
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@ -91,7 +91,7 @@ namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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}
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protected override void scanForObfuscator() {
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decrypterType = new DecrypterType();
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decrypterType = new DecrypterType(module);
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stringDecrypter = new StringDecrypter(module, decrypterType);
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stringDecrypter.find();
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assemblyResolver = new AssemblyResolver(module, decrypterType);
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