102 lines
2.8 KiB
C#
102 lines
2.8 KiB
C#
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/*
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Copyright (C) 2011-2012 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Confuser {
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class Unpacker {
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ModuleDefinition module;
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EmbeddedResource resource;
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public bool Detected {
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get { return resource != null; }
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}
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public Unpacker(ModuleDefinition module) {
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this.module = module;
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}
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static string[] requiredFields = new string[] {
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"System.String",
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};
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static string[] requiredEntryPointLocals = new string[] {
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"System.Byte[]",
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"System.Int32",
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"System.IO.BinaryReader",
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"System.IO.Stream",
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};
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public void find(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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var entryPoint = module.EntryPoint;
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if (entryPoint == null)
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return;
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if (!new LocalTypes(entryPoint).all(requiredEntryPointLocals))
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return;
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var type = entryPoint.DeclaringType;
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if (!new FieldTypes(type).all(requiredFields))
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return;
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if (findDecryptMethod(type) == null)
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return;
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var cctor = DotNetUtils.getMethod(type, ".cctor");
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if (cctor == null)
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return;
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simpleDeobfuscator.deobfuscate(cctor);
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simpleDeobfuscator.decryptStrings(cctor, deob);
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resource = findResource(cctor);
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}
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EmbeddedResource findResource(MethodDefinition method) {
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return DotNetUtils.getResource(module, DotNetUtils.getCodeStrings(method)) as EmbeddedResource;
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}
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static string[] requiredDecryptLocals = new string[] {
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"System.Byte[]",
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"System.IO.Compression.DeflateStream",
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"System.IO.MemoryStream",
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};
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static MethodDefinition findDecryptMethod(TypeDefinition type) {
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foreach (var method in type.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.Byte[]", "(System.Byte[])"))
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continue;
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if (!new LocalTypes(method).all(requiredDecryptLocals))
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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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public byte[] unpack() {
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if (resource == null)
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return null;
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var data = resource.GetResourceData();
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for (int i = 0; i < data.Length; i++)
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data[i] ^= (byte)i;
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data = DeobUtils.inflate(data, true);
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return data;
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}
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}
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}
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