123 lines
3.6 KiB
C#
123 lines
3.6 KiB
C#
/*
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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 AntiDumping : IVersionProvider {
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ModuleDefinition module;
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MethodDefinition initMethod;
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public MethodDefinition InitMethod {
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get { return initMethod; }
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}
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public TypeDefinition 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(ModuleDefinition 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, MethodDefinition 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 MethodDefinition;
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if (calledMethod == null)
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continue;
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if (!DotNetUtils.isMethod(calledMethod, "System.Void", "()"))
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continue;
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simpleDeobfuscator.deobfuscate(calledMethod, true);
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if (checkInitMethod_v14_r58852(calledMethod) || checkInitMethod_v14_r58564(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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static bool checkInitMethod_v14_r58564(MethodDefinition method) {
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if (method == null || method.Body == null || !method.IsStatic)
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return false;
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if (!DotNetUtils.isMethod(method, "System.Void", "()"))
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "kernel32", "VirtualProtect") == null)
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return false;
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if (!DeobUtils.hasInteger(method, 224))
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return false;
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if (!DeobUtils.hasInteger(method, 240))
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return false;
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if (!DeobUtils.hasInteger(method, 267))
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return false;
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var type = method.DeclaringType;
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if (type.Methods.Count != 2)
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return false;
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if (type.Fields.Count != 0)
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return false;
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if (type.Properties.Count != 0)
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return false;
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return true;
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}
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static bool checkInitMethod_v14_r58852(MethodDefinition method) {
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if (method == null || method.Body == null || !method.IsStatic)
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return false;
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if (!DotNetUtils.isMethod(method, "System.Void", "()"))
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return false;
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if (!DeobUtils.hasInteger(method, 0x3C))
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return false;
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if (!DeobUtils.hasInteger(method, 0x6c64746e))
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return false;
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if (!DeobUtils.hasInteger(method, 0x6c642e6c))
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return false;
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if (!DeobUtils.hasInteger(method, 0x6f43744e))
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return false;
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if (!DeobUtils.hasInteger(method, 0x6e69746e))
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "kernel32", "VirtualProtect") == null)
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return false;
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return true;
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}
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public bool getRevisionRange(out int minRev, out int maxRev) {
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minRev = maxRev = 0;
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return false;
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}
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}
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}
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