2012-07-27 14:38:18 +08:00
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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 AntiDebugger {
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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 AntiDebugger(ModuleDefinition module) {
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this.module = module;
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}
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public void find() {
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if (checkMethod(DotNetUtils.getModuleTypeCctor(module)))
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return;
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}
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bool checkMethod(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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2012-07-30 15:13:17 +08:00
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if (!DotNetUtils.isMethod(calledMethod, "System.Void", "()"))
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continue;
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2012-07-27 14:38:18 +08:00
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if (checkInitMethod(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(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.hasString(method, "COR_ENABLE_PROFILING"))
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return false;
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if (!DotNetUtils.hasString(method, "COR_PROFILER"))
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return false;
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if (!DotNetUtils.hasString(method, "Profiler detected"))
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "ntdll", "NtQueryInformationProcess") == null)
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "ntdll", "NtSetInformationProcess") == null)
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "kernel32", "CloseHandle") == null)
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "kernel32", "IsDebuggerPresent") == null)
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "kernel32", "OutputDebugString") == null)
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return false;
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return true;
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}
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}
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}
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