96 lines
2.7 KiB
C#
96 lines
2.7 KiB
C#
/*
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Copyright (C) 2011-2013 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 dnlib.DotNet;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.CryptoObfuscator {
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class AntiDebugger {
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ModuleDefMD module;
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ISimpleDeobfuscator simpleDeobfuscator;
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IDeobfuscator deob;
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TypeDef antiDebuggerType;
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MethodDef antiDebuggerMethod;
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public TypeDef Type {
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get { return antiDebuggerType; }
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}
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public MethodDef Method {
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get { return antiDebuggerMethod; }
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}
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public AntiDebugger(ModuleDefMD module, ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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this.module = module;
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this.simpleDeobfuscator = simpleDeobfuscator;
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this.deob = deob;
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}
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public void find() {
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if (find(module.EntryPoint))
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return;
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if (find(DotNetUtils.getModuleTypeCctor(module)))
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return;
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}
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bool find(MethodDef methodToCheck) {
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if (methodToCheck == null)
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return false;
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foreach (var method in DotNetUtils.getCalledMethods(module, methodToCheck)) {
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var type = method.DeclaringType;
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if (!method.IsStatic || !DotNetUtils.isMethod(method, "System.Void", "()"))
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continue;
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if (DotNetUtils.getPInvokeMethod(type, "kernel32", "LoadLibrary") == null)
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continue;
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if (DotNetUtils.getPInvokeMethod(type, "kernel32", "GetProcAddress") == null)
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continue;
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deobfuscate(method);
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if (!containsString(method, "debugger is activ") &&
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!containsString(method, "debugger is running") &&
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!containsString(method, "Debugger detected") &&
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!containsString(method, "Debugger was detected") &&
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!containsString(method, "{0} was detected") &&
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!containsString(method, "run under") &&
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!containsString(method, "run with"))
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continue;
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antiDebuggerType = type;
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antiDebuggerMethod = method;
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return true;
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}
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return false;
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}
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void deobfuscate(MethodDef method) {
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simpleDeobfuscator.deobfuscate(method);
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simpleDeobfuscator.decryptStrings(method, deob);
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}
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bool containsString(MethodDef method, string part) {
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foreach (var s in DotNetUtils.getCodeStrings(method)) {
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if (s.Contains(part))
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return true;
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}
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return false;
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}
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}
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}
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