321 lines
9.5 KiB
C#
321 lines
9.5 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 AntiDebugger : 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_r57588_normal,
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v14_r57588_safe,
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v14_r60785_normal,
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v16_r61954_normal,
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v16_r61954_safe,
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v17_r73822_normal,
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v17_r73822_safe,
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v17_r74021_normal,
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v17_r74021_safe,
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v19_r76119_safe,
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v19_r78363_normal,
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v19_r78363_safe,
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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 AntiDebugger(ModuleDefMD 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(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 || !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 == null)
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continue;
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if (CheckMethod_normal(type, calledMethod) || CheckMethod_safe(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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static bool CheckProfilerStrings1(MethodDef method) {
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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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return true;
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}
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static bool CheckProfilerStrings2(MethodDef method) {
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if (!DotNetUtils.HasString(method, "COR_"))
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return false;
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if (!DotNetUtils.HasString(method, "ENABLE_PROFILING"))
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return false;
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if (!DotNetUtils.HasString(method, "PROFILER"))
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return false;
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return true;
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}
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static MethodDef GetAntiDebugMethod(TypeDef type, MethodDef initMethod) {
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foreach (var method in type.Methods) {
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if (method.Body == null || method == initMethod)
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continue;
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if (!method.IsStatic || method.Name == ".cctor")
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continue;
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if (!method.IsPrivate)
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continue;
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if (!DotNetUtils.IsMethod(method, "System.Void", "()") && !DotNetUtils.IsMethod(method, "System.Void", "(System.Object)"))
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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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bool CheckMethod_normal(TypeDef type, MethodDef initMethod) {
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var ntQueryInformationProcess = DotNetUtils.GetPInvokeMethod(type, "ntdll", "NtQueryInformationProcess");
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if (ntQueryInformationProcess == null)
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return false;
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if (DotNetUtils.GetPInvokeMethod(type, "ntdll", "NtSetInformationProcess") == null)
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return false;
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if (DotNetUtils.GetPInvokeMethod(type, "kernel32", "CloseHandle") == null)
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return false;
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var antiDebugMethod = GetAntiDebugMethod(type, initMethod);
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if (antiDebugMethod == null)
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return false;
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bool hasDebuggerStrings = DotNetUtils.HasString(antiDebugMethod, "Debugger detected (Managed)");
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if (DotNetUtils.CallsMethod(initMethod, "System.Void System.Threading.Thread::.ctor(System.Threading.ParameterizedThreadStart)")) {
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int failFastCalls = ConfuserUtils.CountCalls(antiDebugMethod, "System.Void System.Environment::FailFast(System.String)");
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if (failFastCalls != 6 && failFastCalls != 8)
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return false;
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if (!CheckProfilerStrings1(initMethod))
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return false;
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if (!DotNetUtils.CallsMethod(antiDebugMethod, "System.Void System.Threading.Thread::.ctor(System.Threading.ParameterizedThreadStart)")) {
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if (!hasDebuggerStrings)
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return false;
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if (ConfuserUtils.CountCalls(antiDebugMethod, ntQueryInformationProcess) != 2)
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return false;
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version = ConfuserVersion.v16_r61954_normal;
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}
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else if (failFastCalls == 8) {
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if (!hasDebuggerStrings)
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return false;
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if (ConfuserUtils.CountCalls(antiDebugMethod, ntQueryInformationProcess) != 2)
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return false;
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version = ConfuserVersion.v17_r73822_normal;
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}
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else if (failFastCalls == 6) {
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if (DotNetUtils.GetPInvokeMethod(type, "IsDebuggerPresent") == null)
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return false;
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if (ConfuserUtils.CountCalls(antiDebugMethod, ntQueryInformationProcess) != 0)
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return false;
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if (hasDebuggerStrings)
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version = ConfuserVersion.v17_r74021_normal;
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else
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version = ConfuserVersion.v19_r78363_normal;
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}
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else
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return false;
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}
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else if (!DotNetUtils.CallsMethod(initMethod, "System.Void System.Threading.ThreadStart::.ctor(System.Object,System.IntPtr)")) {
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if (!hasDebuggerStrings)
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return false;
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if (!DotNetUtils.CallsMethod(initMethod, "System.Void System.Diagnostics.Process::EnterDebugMode()"))
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return false;
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if (!CheckProfilerStrings1(antiDebugMethod))
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return false;
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version = ConfuserVersion.v14_r57588_normal;
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}
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else {
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if (!hasDebuggerStrings)
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return false;
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if (!DotNetUtils.CallsMethod(initMethod, "System.Void System.Diagnostics.Process::EnterDebugMode()"))
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return false;
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if (!CheckProfilerStrings1(antiDebugMethod))
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return false;
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version = ConfuserVersion.v14_r60785_normal;
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}
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return true;
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}
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bool CheckMethod_safe(TypeDef type, MethodDef initMethod) {
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if (type == DotNetUtils.GetModuleType(module)) {
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if (!DotNetUtils.HasString(initMethod, "Debugger detected (Managed)"))
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return false;
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if (!CheckProfilerStrings1(initMethod))
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return false;
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version = ConfuserVersion.v14_r57588_safe;
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}
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else {
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var ntQueryInformationProcess = DotNetUtils.GetPInvokeMethod(type, "ntdll", "NtQueryInformationProcess");
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if (ntQueryInformationProcess == null)
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return false;
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if (DotNetUtils.GetPInvokeMethod(type, "ntdll", "NtSetInformationProcess") == null)
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return false;
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if (DotNetUtils.GetPInvokeMethod(type, "kernel32", "CloseHandle") == null)
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return false;
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var antiDebugMethod = GetAntiDebugMethod(type, initMethod);
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if (antiDebugMethod == null)
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return false;
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bool hasDebuggerStrings = DotNetUtils.HasString(antiDebugMethod, "Debugger detected (Managed)") ||
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DotNetUtils.HasString(antiDebugMethod, "Debugger is detected (Managed)");
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if (!DotNetUtils.CallsMethod(initMethod, "System.Void System.Threading.Thread::.ctor(System.Threading.ParameterizedThreadStart)"))
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return false;
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if (ConfuserUtils.CountCalls(antiDebugMethod, ntQueryInformationProcess) != 0)
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return false;
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if (!CheckProfilerStrings1(initMethod) && !CheckProfilerStrings2(initMethod))
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return false;
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int failFastCalls = ConfuserUtils.CountCalls(antiDebugMethod, "System.Void System.Environment::FailFast(System.String)");
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if (failFastCalls != 2)
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return false;
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if (hasDebuggerStrings) {
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if (!DotNetUtils.CallsMethod(antiDebugMethod, "System.Void System.Threading.Thread::.ctor(System.Threading.ParameterizedThreadStart)"))
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version = ConfuserVersion.v16_r61954_safe;
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else if (DotNetUtils.GetPInvokeMethod(type, "IsDebuggerPresent") == null)
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version = ConfuserVersion.v17_r73822_safe;
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else if (CheckProfilerStrings1(initMethod))
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version = ConfuserVersion.v17_r74021_safe;
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else
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version = ConfuserVersion.v19_r76119_safe;
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}
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else {
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version = ConfuserVersion.v19_r78363_safe;
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}
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}
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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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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_r57588_safe:
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minRev = 57588;
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maxRev = 60787;
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return true;
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case ConfuserVersion.v16_r61954_safe:
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minRev = 61954;
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maxRev = 73791;
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return true;
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case ConfuserVersion.v17_r73822_safe:
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minRev = 73822;
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maxRev = 73822;
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return true;
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case ConfuserVersion.v17_r74021_safe:
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minRev = 74021;
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maxRev = 76101;
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return true;
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case ConfuserVersion.v19_r76119_safe:
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minRev = 76119;
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maxRev = 78342;
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return true;
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case ConfuserVersion.v19_r78363_safe:
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minRev = 78363;
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maxRev = int.MaxValue;
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return true;
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case ConfuserVersion.v14_r57588_normal:
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minRev = 57588;
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maxRev = 60408;
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return true;
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case ConfuserVersion.v14_r60785_normal:
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minRev = 60785;
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maxRev = 60787;
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return true;
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case ConfuserVersion.v16_r61954_normal:
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minRev = 61954;
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maxRev = 73791;
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return true;
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case ConfuserVersion.v17_r73822_normal:
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minRev = 73822;
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maxRev = 73822;
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return true;
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case ConfuserVersion.v17_r74021_normal:
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minRev = 74021;
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maxRev = 78342;
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return true;
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case ConfuserVersion.v19_r78363_normal:
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minRev = 78363;
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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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