Support V4 string decryptor
This commit is contained in:
parent
4cfa0cf1f3
commit
f9ed9e403f
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@ -136,7 +136,7 @@ namespace de4dot.code.deobfuscators.DeepSea {
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foreach (var method in stringDecrypter.DecrypterMethods) {
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foreach (var method in stringDecrypter.DecrypterMethods) {
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staticStringInliner.add(method, (method2, args) => {
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staticStringInliner.add(method, (method2, args) => {
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return stringDecrypter.decrypt(method2, (int)args[0]);
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return stringDecrypter.decrypt(method2, args);
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});
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});
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}
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}
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DeobfuscatedFile.stringDecryptersAdded();
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DeobfuscatedFile.stringDecryptersAdded();
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@ -180,8 +180,10 @@ namespace de4dot.code.deobfuscators.DeepSea {
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public override void deobfuscateEnd() {
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public override void deobfuscateEnd() {
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removeInlinedMethods();
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removeInlinedMethods();
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if (Operations.DecryptStrings != OpDecryptString.None)
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if (Operations.DecryptStrings != OpDecryptString.None) {
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addMethodsToBeRemoved(stringDecrypter.DecrypterMethods, "String decrypter method");
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addMethodsToBeRemoved(stringDecrypter.DecrypterMethods, "String decrypter method");
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stringDecrypter.cleanup();
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}
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base.deobfuscateEnd();
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base.deobfuscateEnd();
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}
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}
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@ -17,6 +17,7 @@
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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*/
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using System;
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using System.Collections.Generic;
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using System.Collections.Generic;
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using System.Text;
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using System.Text;
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using Mono.Cecil;
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using Mono.Cecil;
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@ -26,22 +27,245 @@ using de4dot.blocks;
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namespace de4dot.code.deobfuscators.DeepSea {
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namespace de4dot.code.deobfuscators.DeepSea {
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class StringDecrypter {
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class StringDecrypter {
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ModuleDefinition module;
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ModuleDefinition module;
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MethodDefinitionAndDeclaringTypeDict<DecrypterInfo> methodToInfo = new MethodDefinitionAndDeclaringTypeDict<DecrypterInfo>();
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MethodDefinitionAndDeclaringTypeDict<IDecrypterInfo> methodToInfo = new MethodDefinitionAndDeclaringTypeDict<IDecrypterInfo>();
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class DecrypterInfo {
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interface IDecrypterInfo {
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MethodDefinition Method { get; }
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string decrypt(object[] args);
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void cleanup();
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}
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static short[] findKey(MethodDefinition initMethod, FieldDefinition keyField) {
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var instrs = initMethod.Body.Instructions;
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for (int i = 0; i < instrs.Count - 2; 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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var newarr = instrs[i + 1];
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if (newarr.OpCode.Code != Code.Newarr)
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continue;
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if (newarr.Operand.ToString() != "System.Char")
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continue;
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var stloc = instrs[i + 2];
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if (!DotNetUtils.isStloc(stloc))
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continue;
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var local = DotNetUtils.getLocalVar(initMethod.Body.Variables, stloc);
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int startInitIndex = i;
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i++;
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var array = ArrayFinder.getInitializedInt16Array(DotNetUtils.getLdcI4Value(ldci4), initMethod, ref i);
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if (array == null)
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continue;
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var field = getStoreField(initMethod, startInitIndex, local);
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if (field == null)
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continue;
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if (MemberReferenceHelper.compareFieldReferenceAndDeclaringType(keyField, field))
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return array;
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}
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return null;
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}
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static FieldDefinition getStoreField(MethodDefinition method, int startIndex, VariableDefinition local) {
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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 ldloc = instrs[i];
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if (!DotNetUtils.isLdloc(ldloc))
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continue;
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if (DotNetUtils.getLocalVar(method.Body.Variables, ldloc) != local)
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continue;
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var stsfld = instrs[i + 1];
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if (stsfld.OpCode.Code != Code.Stsfld)
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continue;
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return stsfld.Operand as FieldDefinition;
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}
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return null;
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}
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class DecrypterInfo4 : IDecrypterInfo {
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MethodDefinition cctor;
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MethodDefinition cctor;
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public MethodDefinition method;
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public MethodDefinition Method { get; set; }
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int magic;
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FieldDefinition cachedStringsField;
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FieldDefinition keyField;
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FieldDefinition encryptedStringsField;
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FieldDefinition encryptedDataField;
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short[] key;
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ushort[] encryptedData;
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public DecrypterInfo4(MethodDefinition cctor, MethodDefinition method) {
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this.cctor = cctor;
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this.Method = method;
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}
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public bool initialize() {
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if (!findMagic(Method, out magic))
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return false;
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var charArrayFields = findFields();
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if (charArrayFields == null || charArrayFields.Count != 2)
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return false;
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encryptedStringsField = findEncryptedStrings(cctor, charArrayFields, out encryptedDataField);
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if (encryptedStringsField == null)
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return false;
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if (encryptedDataField.InitialValue.Length % 2 == 1)
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return false;
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encryptedData = new ushort[encryptedDataField.InitialValue.Length / 2];
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Buffer.BlockCopy(encryptedDataField.InitialValue, 0, encryptedData, 0, encryptedDataField.InitialValue.Length);
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charArrayFields.Remove(encryptedStringsField);
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keyField = charArrayFields[0];
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key = findKey();
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if (key == null || key.Length == 0)
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return false;
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return true;
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}
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static bool findMagic(MethodDefinition method, out int magic) {
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count - 2; i++) {
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var ldarg = instrs[i];
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if (DotNetUtils.getArgIndex(ldarg) < 0)
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continue;
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var ldci4 = instrs[i + 1];
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if (!DotNetUtils.isLdcI4(ldci4))
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continue;
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if (instrs[i + 2].OpCode.Code != Code.Xor)
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continue;
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magic = DotNetUtils.getLdcI4Value(ldci4);
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return true;
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}
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magic = 0;
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return false;
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}
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List<FieldDefinition> findFields() {
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var charArrayFields = new List<FieldDefinition>();
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foreach (var instr in Method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Stsfld && instr.OpCode.Code != Code.Ldsfld)
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continue;
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var field = instr.Operand as FieldDefinition;
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if (field == null)
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continue;
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if (!MemberReferenceHelper.compareTypes(Method.DeclaringType, field.DeclaringType))
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continue;
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switch (field.FieldType.FullName) {
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case "System.Char[]":
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if (!charArrayFields.Contains(field))
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charArrayFields.Add(field);
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break;
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case "System.String[]":
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if (cachedStringsField != null && cachedStringsField != field)
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return null;
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cachedStringsField = field;
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break;
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default:
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break;
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}
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}
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if (cachedStringsField == null)
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return null;
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return charArrayFields;
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}
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static FieldDefinition findEncryptedStrings(MethodDefinition initMethod, List<FieldDefinition> ourFields, out FieldDefinition dataField) {
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for (int i = 0; i < initMethod.Body.Instructions.Count; i++) {
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var instrs = DotNetUtils.getInstructions(initMethod.Body.Instructions, i, OpCodes.Ldtoken, OpCodes.Call, OpCodes.Stsfld);
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if (instrs == null)
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continue;
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dataField = instrs[0].Operand as FieldDefinition;
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if (dataField == null || dataField.InitialValue == null || dataField.InitialValue.Length == 0)
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continue;
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var savedField = instrs[2].Operand as FieldDefinition;
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if (savedField == null || !matches(ourFields, savedField))
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continue;
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return savedField;
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}
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dataField = null;
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return null;
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}
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static bool matches(IEnumerable<FieldDefinition> ourFields, FieldReference field) {
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foreach (var ourField in ourFields) {
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if (MemberReferenceHelper.compareFieldReferenceAndDeclaringType(ourField, field))
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return true;
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}
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return false;
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}
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short[] findKey() {
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var pkt = cctor.Module.Assembly.Name.PublicKeyToken;
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if (pkt != null && pkt.Length > 0)
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return getPublicKeyTokenKey(pkt);
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return findKey(cctor);
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}
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short[] findKey(MethodDefinition initMethod) {
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return StringDecrypter.findKey(initMethod, keyField);
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}
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static short[] getPublicKeyTokenKey(byte[] publicKeyToken) {
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var key = new short[publicKeyToken.Length];
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for (int i = 0; i < publicKeyToken.Length; i++) {
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int b = publicKeyToken[i];
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key[i] = (short)((b << 4) ^ b);
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}
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return key;
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}
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public string decrypt(object[] args) {
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return decrypt((int)args[0], (int)args[1]);
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}
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string decrypt(int magic2, int magic3) {
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int index = magic ^ magic2 ^ magic3;
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int cachedIndex = (ushort)encryptedData[index++];
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int stringLen = (int)(ushort)encryptedData[index++] + ((int)(ushort)encryptedData[index++] << 16);
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var sb = new StringBuilder(stringLen);
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for (int i = 0; i < stringLen; i++)
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sb.Append((char)(encryptedData[index++] ^ key[cachedIndex++ % key.Length]));
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return sb.ToString();
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}
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public void cleanup() {
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encryptedDataField.InitialValue = new byte[0];
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}
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}
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class DecrypterInfo3 : IDecrypterInfo {
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MethodDefinition cctor;
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public MethodDefinition Method { get; set; }
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FieldDefinition cachedStringsField;
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FieldDefinition cachedStringsField;
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FieldDefinition keyField;
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FieldDefinition keyField;
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int magic;
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int magic;
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string[] encryptedStrings;
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string[] encryptedStrings;
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short[] key;
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short[] key;
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public DecrypterInfo(MethodDefinition cctor, MethodDefinition method) {
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public DecrypterInfo3(MethodDefinition cctor, MethodDefinition method) {
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this.cctor = cctor;
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this.cctor = cctor;
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this.method = method;
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this.Method = method;
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}
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}
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public string decrypt(int magic2) {
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public string decrypt(object[] args) {
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return decrypt((int)args[0]);
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}
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string decrypt(int magic2) {
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var es = encryptedStrings[magic ^ magic2];
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var es = encryptedStrings[magic ^ magic2];
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var sb = new StringBuilder(es.Length);
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var sb = new StringBuilder(es.Length);
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for (int i = 0; i < es.Length; i++)
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for (int i = 0; i < es.Length; i++)
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@ -50,13 +274,13 @@ namespace de4dot.code.deobfuscators.DeepSea {
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}
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}
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public bool initialize() {
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public bool initialize() {
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if (!findMagic(method, out magic))
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if (!findMagic(Method, out magic))
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return false;
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return false;
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if (!findFields())
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if (!findFields())
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return false;
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return false;
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if (!findEncryptedStrings(method))
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if (!findEncryptedStrings(Method))
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return false;
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return false;
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key = findKey();
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key = findKey();
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@ -67,13 +291,13 @@ namespace de4dot.code.deobfuscators.DeepSea {
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}
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}
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bool findFields() {
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bool findFields() {
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foreach (var instr in method.Body.Instructions) {
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foreach (var instr in Method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Stsfld && instr.OpCode.Code != Code.Ldsfld)
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if (instr.OpCode.Code != Code.Stsfld && instr.OpCode.Code != Code.Ldsfld)
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continue;
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continue;
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var field = instr.Operand as FieldDefinition;
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var field = instr.Operand as FieldDefinition;
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if (field == null)
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if (field == null)
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continue;
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continue;
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if (!MemberReferenceHelper.compareTypes(method.DeclaringType, field.DeclaringType))
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if (!MemberReferenceHelper.compareTypes(Method.DeclaringType, field.DeclaringType))
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continue;
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continue;
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switch (field.FieldType.FullName) {
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switch (field.FieldType.FullName) {
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case "System.Char[]":
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case "System.Char[]":
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@ -104,32 +328,7 @@ namespace de4dot.code.deobfuscators.DeepSea {
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}
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}
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short[] findKey(MethodDefinition initMethod) {
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short[] findKey(MethodDefinition initMethod) {
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var instrs = initMethod.Body.Instructions;
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return StringDecrypter.findKey(initMethod, keyField);
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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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var newarr = instrs[i + 1];
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if (newarr.OpCode.Code != Code.Newarr)
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continue;
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if (newarr.Operand.ToString() != "System.Char")
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continue;
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i++;
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var array = ArrayFinder.getInitializedInt16Array(DotNetUtils.getLdcI4Value(ldci4), initMethod, ref i);
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if (array == null)
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continue;
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i++;
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if (i >= instrs.Count)
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return null;
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var stsfld = instrs[i];
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if (stsfld.OpCode.Code != Code.Stsfld)
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continue;
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if (MemberReferenceHelper.compareFieldReferenceAndDeclaringType(keyField, stsfld.Operand as FieldReference))
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return array;
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}
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return null;
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}
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}
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static short[] getPublicKeyTokenKey(byte[] publicKeyToken) {
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static short[] getPublicKeyTokenKey(byte[] publicKeyToken) {
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@ -145,7 +344,7 @@ namespace de4dot.code.deobfuscators.DeepSea {
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var instrs = method.Body.Instructions;
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count - 2; i++) {
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for (int i = 0; i < instrs.Count - 2; i++) {
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var ldarg = instrs[i];
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var ldarg = instrs[i];
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if (DotNetUtils.getArgIndex(ldarg) != 0)
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if (DotNetUtils.getArgIndex(ldarg) < 0)
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continue;
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continue;
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var ldci4 = instrs[i + 1];
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var ldci4 = instrs[i + 1];
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if (!DotNetUtils.isLdcI4(ldci4))
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if (!DotNetUtils.isLdcI4(ldci4))
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@ -186,6 +385,9 @@ namespace de4dot.code.deobfuscators.DeepSea {
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return switchInstr;
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return switchInstr;
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}
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}
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public void cleanup() {
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}
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public override string ToString() {
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public override string ToString() {
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return string.Format("M:{0:X8} N:{1}", magic, encryptedStrings.Length);
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return string.Format("M:{0:X8} N:{1}", magic, encryptedStrings.Length);
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}
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}
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@ -199,7 +401,7 @@ namespace de4dot.code.deobfuscators.DeepSea {
|
||||||
get {
|
get {
|
||||||
var methods = new List<MethodDefinition>(methodToInfo.Count);
|
var methods = new List<MethodDefinition>(methodToInfo.Count);
|
||||||
foreach (var info in methodToInfo.getValues())
|
foreach (var info in methodToInfo.getValues())
|
||||||
methods.Add(info.method);
|
methods.Add(info.Method);
|
||||||
return methods;
|
return methods;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
@ -218,9 +420,30 @@ namespace de4dot.code.deobfuscators.DeepSea {
|
||||||
continue;
|
continue;
|
||||||
if (!hasPublicKeyToken)
|
if (!hasPublicKeyToken)
|
||||||
simpleDeobfuscator.deobfuscate(cctor);
|
simpleDeobfuscator.deobfuscate(cctor);
|
||||||
|
|
||||||
|
foreach (var method in type.Methods) {
|
||||||
|
if (method.Body == null)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
IDecrypterInfo info = null;
|
||||||
|
|
||||||
|
if (DotNetUtils.isMethod(method, "System.String", "(System.Int32)")) {
|
||||||
|
simpleDeobfuscator.deobfuscate(method);
|
||||||
|
info = getInfoV3(cctor, method);
|
||||||
|
}
|
||||||
|
else if (DotNetUtils.isMethod(method, "System.String", "(System.Int32,System.Int32)")) {
|
||||||
|
simpleDeobfuscator.deobfuscate(method);
|
||||||
|
info = getInfoV4(cctor, method);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (info == null)
|
||||||
|
continue;
|
||||||
|
methodToInfo.add(method, info);
|
||||||
|
}
|
||||||
|
|
||||||
foreach (var method in DotNetUtils.findMethods(type.Methods, "System.String", new string[] { "System.Int32" }, true)) {
|
foreach (var method in DotNetUtils.findMethods(type.Methods, "System.String", new string[] { "System.Int32" }, true)) {
|
||||||
simpleDeobfuscator.deobfuscate(method);
|
simpleDeobfuscator.deobfuscate(method);
|
||||||
var info = getInfo(cctor, method);
|
var info = getInfoV3(cctor, method);
|
||||||
if (info == null)
|
if (info == null)
|
||||||
continue;
|
continue;
|
||||||
methodToInfo.add(method, info);
|
methodToInfo.add(method, info);
|
||||||
|
@ -245,20 +468,28 @@ namespace de4dot.code.deobfuscators.DeepSea {
|
||||||
return foundCharAry && foundStringAry;
|
return foundCharAry && foundStringAry;
|
||||||
}
|
}
|
||||||
|
|
||||||
DecrypterInfo getInfo(MethodDefinition cctor, MethodDefinition method) {
|
DecrypterInfo3 getInfoV3(MethodDefinition cctor, MethodDefinition method) {
|
||||||
if (method == null || method.Body == null)
|
var info = new DecrypterInfo3(cctor, method);
|
||||||
return null;
|
|
||||||
|
|
||||||
var info = new DecrypterInfo(cctor, method);
|
|
||||||
if (!info.initialize())
|
if (!info.initialize())
|
||||||
return null;
|
return null;
|
||||||
|
|
||||||
return info;
|
return info;
|
||||||
}
|
}
|
||||||
|
|
||||||
public string decrypt(MethodReference method, int magic2) {
|
DecrypterInfo4 getInfoV4(MethodDefinition cctor, MethodDefinition method) {
|
||||||
|
var info = new DecrypterInfo4(cctor, method);
|
||||||
|
if (!info.initialize())
|
||||||
|
return null;
|
||||||
|
return info;
|
||||||
|
}
|
||||||
|
|
||||||
|
public string decrypt(MethodReference method, object[] args) {
|
||||||
var info = methodToInfo.find(method);
|
var info = methodToInfo.find(method);
|
||||||
return info.decrypt(magic2);
|
return info.decrypt(args);
|
||||||
|
}
|
||||||
|
|
||||||
|
public void cleanup() {
|
||||||
|
foreach (var info in methodToInfo.getValues())
|
||||||
|
info.cleanup();
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue
Block a user