246 lines
6.9 KiB
C#
246 lines
6.9 KiB
C#
/*
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Copyright (C) 2011-2015 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 System;
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Confuser {
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class AntiDumping : IVersionProvider {
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ModuleDefMD module;
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MethodDef initMethod;
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ConfuserVersion version = ConfuserVersion.Unknown;
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enum ConfuserVersion {
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Unknown,
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v14_r58564,
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v14_r58852,
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v16_r69339,
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v17_r74708,
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v18_r75257,
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v19_r75725,
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v19_r76186,
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}
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public MethodDef InitMethod {
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get { return initMethod; }
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}
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public TypeDef Type {
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get { return initMethod != null ? initMethod.DeclaringType : null; }
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}
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public bool Detected {
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get { return initMethod != null; }
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}
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public AntiDumping(ModuleDefMD module) {
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this.module = module;
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}
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public void Find(ISimpleDeobfuscator simpleDeobfuscator) {
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if (CheckMethod(simpleDeobfuscator, DotNetUtils.GetModuleTypeCctor(module)))
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return;
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}
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bool CheckMethod(ISimpleDeobfuscator simpleDeobfuscator, MethodDef method) {
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if (method == null || method.Body == null)
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return false;
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foreach (var instr in method.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 MethodDef;
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if (calledMethod == null)
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continue;
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if (calledMethod == null || !calledMethod.IsStatic)
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continue;
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if (!DotNetUtils.IsMethod(calledMethod, "System.Void", "()"))
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continue;
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var type = calledMethod.DeclaringType;
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if (type.NestedTypes.Count > 0)
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continue;
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simpleDeobfuscator.Deobfuscate(calledMethod, SimpleDeobfuscatorFlags.Force | SimpleDeobfuscatorFlags.DisableConstantsFolderExtraInstrs);
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if (CheckType(type, calledMethod)) {
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initMethod = calledMethod;
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return true;
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}
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}
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return false;
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}
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bool CheckType(TypeDef type, MethodDef initMethod) {
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return CheckType_v14_r58564(type, initMethod) ||
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CheckType_v14_r58852(type, initMethod);
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}
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bool CheckType_v14_r58564(TypeDef type, MethodDef initMethod) {
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var virtualProtect = DotNetUtils.GetPInvokeMethod(type, "VirtualProtect");
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if (virtualProtect == null)
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return false;
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if (!DotNetUtils.CallsMethod(initMethod, "System.IntPtr System.Runtime.InteropServices.Marshal::GetHINSTANCE(System.Reflection.Module)"))
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return false;
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if (ConfuserUtils.CountCalls(initMethod, virtualProtect) != 3)
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return false;
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if (!DeobUtils.HasInteger(initMethod, 224))
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return false;
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if (!DeobUtils.HasInteger(initMethod, 240))
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return false;
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if (!DeobUtils.HasInteger(initMethod, 267))
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return false;
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version = ConfuserVersion.v14_r58564;
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return true;
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}
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bool CheckType_v14_r58852(TypeDef type, MethodDef initMethod) {
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var virtualProtect = DotNetUtils.GetPInvokeMethod(type, "VirtualProtect");
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if (virtualProtect == null)
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return false;
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if (!DotNetUtils.CallsMethod(initMethod, "System.IntPtr System.Runtime.InteropServices.Marshal::GetHINSTANCE(System.Reflection.Module)"))
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return false;
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int virtualProtectCalls = ConfuserUtils.CountCalls(initMethod, virtualProtect);
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if (virtualProtectCalls != 14 && virtualProtectCalls != 16)
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return false;
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if (!DeobUtils.HasInteger(initMethod, 0x3C))
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return false;
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if (!DeobUtils.HasInteger(initMethod, 0x6c64746e))
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return false;
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if (!DeobUtils.HasInteger(initMethod, 0x6c642e6c))
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return false;
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if (!DeobUtils.HasInteger(initMethod, 0x6f43744e))
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return false;
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if (!DeobUtils.HasInteger(initMethod, 0x6e69746e))
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return false;
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int locallocs = ConfuserUtils.CountOpCode(initMethod, Code.Localloc);
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if (DeobUtils.HasInteger(initMethod, 0x18))
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version = ConfuserVersion.v14_r58852;
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else if (virtualProtectCalls == 16)
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version = ConfuserVersion.v16_r69339;
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else if (virtualProtectCalls == 14) {
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if (locallocs == 2)
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version = ConfuserVersion.v17_r74708;
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else if (locallocs == 1) {
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if (DotNetUtils.HasString(initMethod, "<Unknown>"))
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version = ConfuserVersion.v18_r75257;
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else if (IsRev75725(initMethod))
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version = ConfuserVersion.v19_r75725;
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else
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version = ConfuserVersion.v19_r76186;
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}
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else
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return false;
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}
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else
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return false;
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return true;
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}
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static bool IsRev75725(MethodDef method) {
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count - 9; i++) {
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if (!instrs[i].IsLdcI4() || instrs[i].GetLdcI4Value() != 8)
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continue;
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if (!instrs[i + 1].IsLdcI4() || instrs[i + 1].GetLdcI4Value() != 64)
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continue;
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if (instrs[i + 2].OpCode.Code != Code.Ldloca && instrs[i + 2].OpCode.Code != Code.Ldloca_S)
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continue;
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var call = instrs[i + 3];
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if (call.OpCode.Code != Code.Call)
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continue;
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var calledMethod = call.Operand as MethodDef;
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if (calledMethod == null || calledMethod.ImplMap == null || calledMethod.ImplMap.Name != "VirtualProtect")
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continue;
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if (instrs[i + 4].OpCode.Code != Code.Pop)
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continue;
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var ldloc = instrs[i + 5];
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if (!ldloc.IsLdloc())
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continue;
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var local = ldloc.GetLocal(method.Body.Variables);
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if (local == null)
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continue;
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if (!instrs[i + 6].IsLdcI4() || instrs[i + 6].GetLdcI4Value() != 0)
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continue;
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if (instrs[i + 7].OpCode.Code != Code.Stind_I4)
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continue;
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ldloc = instrs[i + 8];
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if (!ldloc.IsLdloc() || local != ldloc.GetLocal(method.Body.Variables))
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continue;
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if (!instrs[i + 9].IsLdcI4() || instrs[i + 9].GetLdcI4Value() != 4)
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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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public bool GetRevisionRange(out int minRev, out int maxRev) {
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switch (version) {
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case ConfuserVersion.Unknown:
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minRev = maxRev = 0;
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return false;
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case ConfuserVersion.v14_r58564:
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minRev = 58564;
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maxRev = 58817;
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return true;
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case ConfuserVersion.v14_r58852:
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minRev = 58852;
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maxRev = 67058;
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return true;
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case ConfuserVersion.v16_r69339:
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minRev = 69339;
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maxRev = 74637;
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return true;
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case ConfuserVersion.v17_r74708:
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minRev = 74708;
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maxRev = 75184;
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return true;
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case ConfuserVersion.v18_r75257:
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minRev = 75257;
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maxRev = 75720;
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return true;
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case ConfuserVersion.v19_r75725:
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minRev = 75725;
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maxRev = 76163;
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return true;
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case ConfuserVersion.v19_r76186:
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minRev = 76186;
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maxRev = int.MaxValue;
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return true;
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default: throw new ApplicationException("Invalid version");
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}
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}
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}
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}
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