Detect anti debugger version
This commit is contained in:
de4dot
parent
0d9c298dcb
commit
f7c1676d1d
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@ -17,6 +17,7 @@
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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 Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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@ -25,6 +26,21 @@ namespace de4dot.code.deobfuscators.Confuser {
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class AntiDebugger : IVersionProvider {
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ModuleDefinition module;
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MethodDefinition 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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}
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public MethodDefinition InitMethod {
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get { return initMethod; }
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@ -55,64 +71,224 @@ namespace de4dot.code.deobfuscators.Confuser {
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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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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 (checkInitMethod(calledMethod) || checkInitMethod2(calledMethod)) {
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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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bool checkInitMethod(MethodDefinition method) {
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if (method == null || method.Body == null || !method.IsStatic)
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static bool checkProfilerStrings1(MethodDefinition method) {
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if (!DotNetUtils.hasString(method, "COR_ENABLE_PROFILING"))
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return false;
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if (!DotNetUtils.isMethod(method, "System.Void", "()"))
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if (!DotNetUtils.hasString(method, "COR_PROFILER"))
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return false;
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if (DotNetUtils.hasString(method, "COR_ENABLE_PROFILING") &&
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DotNetUtils.hasString(method, "COR_PROFILER")) {
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return true;
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}
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static bool checkProfilerStrings2(MethodDefinition 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 MethodDefinition getAntiDebugMethod(TypeDefinition type, MethodDefinition 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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else if (DotNetUtils.hasString(method, "COR_") &&
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DotNetUtils.hasString(method, "ENABLE_PROFILING") &&
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DotNetUtils.hasString(method, "PROFILER")) {
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return null;
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}
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bool checkMethod_normal(TypeDefinition type, MethodDefinition 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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if (!DotNetUtils.hasString(antiDebugMethod, "Debugger detected (Managed)"))
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return false;
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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 (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 (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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version = ConfuserVersion.v17_r74021_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
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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 (method.DeclaringType != DotNetUtils.getModuleType(module)) {
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "ntdll", "NtQueryInformationProcess") == null)
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else if (!DotNetUtils.callsMethod(initMethod, "System.Void System.Threading.ThreadStart::.ctor(System.Object,System.IntPtr)")) {
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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 (DotNetUtils.getPInvokeMethod(method.DeclaringType, "ntdll", "NtSetInformationProcess") == null)
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if (!checkProfilerStrings1(antiDebugMethod))
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "kernel32", "CloseHandle") == null)
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version = ConfuserVersion.v14_r57588_normal;
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}
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else {
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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 checkInitMethod2(MethodDefinition method) {
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if (method.DeclaringType == DotNetUtils.getModuleType(module))
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return false;
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count; i++) {
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var call = instrs[i];
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if (call.OpCode.Code != Code.Call)
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continue;
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if (checkInitMethod(call.Operand as MethodDefinition))
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return true;
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bool checkMethod_safe(TypeDefinition type, MethodDefinition 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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return false;
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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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if (!DotNetUtils.hasString(antiDebugMethod, "Debugger detected (Managed)") &&
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!DotNetUtils.hasString(antiDebugMethod, "Debugger is detected (Managed)"))
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return false;
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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 (!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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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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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 = 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 = 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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