Detect anti dump version
This commit is contained in:
de4dot
parent
f7c1676d1d
commit
5376c74919
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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 +26,18 @@ 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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ConfuserVersion version = ConfuserVersion.Unknown;
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enum ConfuserVersion {
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Unknown,
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v14_r58564,
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v14_r58852,
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v16_r69339,
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v17_r74708,
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v18_r75257,
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v19_r75725,
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v19_r76186,
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}
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public MethodDefinition InitMethod {
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get { return initMethod; }
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@ -57,11 +70,16 @@ namespace de4dot.code.deobfuscators.Confuser {
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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 (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.NestedTypes.Count > 0)
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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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if (checkType(type, calledMethod)) {
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initMethod = calledMethod;
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return true;
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}
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@ -69,54 +87,159 @@ namespace de4dot.code.deobfuscators.Confuser {
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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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bool checkType(TypeDefinition type, MethodDefinition initMethod) {
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return checkType_v14_r58564(type, initMethod) ||
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checkType_v14_r58852(type, initMethod);
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}
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bool checkType_v14_r58564(TypeDefinition type, MethodDefinition initMethod) {
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var virtualProtect = DotNetUtils.getPInvokeMethod(type, "VirtualProtect");
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if (virtualProtect == null)
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return false;
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if (!DotNetUtils.isMethod(method, "System.Void", "()"))
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if (!DotNetUtils.callsMethod(initMethod, "System.IntPtr System.Runtime.InteropServices.Marshal::GetHINSTANCE(System.Reflection.Module)"))
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return false;
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if (DotNetUtils.getPInvokeMethod(method.DeclaringType, "kernel32", "VirtualProtect") == null)
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if (ConfuserUtils.countCalls(initMethod, virtualProtect) != 3)
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return false;
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if (!DeobUtils.hasInteger(method, 224))
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if (!DeobUtils.hasInteger(initMethod, 224))
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return false;
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if (!DeobUtils.hasInteger(method, 240))
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if (!DeobUtils.hasInteger(initMethod, 240))
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return false;
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if (!DeobUtils.hasInteger(method, 267))
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if (!DeobUtils.hasInteger(initMethod, 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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version = ConfuserVersion.v14_r58564;
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return true;
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}
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bool checkType_v14_r58852(TypeDefinition type, MethodDefinition initMethod) {
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var virtualProtect = DotNetUtils.getPInvokeMethod(type, "VirtualProtect");
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if (virtualProtect == null)
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return false;
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if (type.Fields.Count != 0)
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if (!DotNetUtils.callsMethod(initMethod, "System.IntPtr System.Runtime.InteropServices.Marshal::GetHINSTANCE(System.Reflection.Module)"))
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return false;
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if (type.Properties.Count != 0)
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int virtualProtectCalls = ConfuserUtils.countCalls(initMethod, virtualProtect);
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if (virtualProtectCalls != 14 && virtualProtectCalls != 16)
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return false;
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if (!DeobUtils.hasInteger(initMethod, 0x3C))
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return false;
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if (!DeobUtils.hasInteger(initMethod, 0x6c64746e))
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return false;
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if (!DeobUtils.hasInteger(initMethod, 0x6c642e6c))
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return false;
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if (!DeobUtils.hasInteger(initMethod, 0x6f43744e))
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return false;
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if (!DeobUtils.hasInteger(initMethod, 0x6e69746e))
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return false;
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int locallocs = ConfuserUtils.countOpCode(initMethod, Code.Localloc);
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if (DeobUtils.hasInteger(initMethod, 0x18))
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version = ConfuserVersion.v14_r58852;
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else if (virtualProtectCalls == 16)
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version = ConfuserVersion.v16_r69339;
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else if (virtualProtectCalls == 14) {
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if (locallocs == 2)
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version = ConfuserVersion.v17_r74708;
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else if (locallocs == 1) {
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if (DotNetUtils.hasString(initMethod, "<Unknown>"))
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version = ConfuserVersion.v18_r75257;
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else if (isRev75725(initMethod))
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version = ConfuserVersion.v19_r75725;
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else
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version = ConfuserVersion.v19_r76186;
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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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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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static bool isRev75725(MethodDefinition method) {
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count - 9; i++) {
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if (!DotNetUtils.isLdcI4(instrs[i]) || DotNetUtils.getLdcI4Value(instrs[i]) != 8)
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continue;
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if (!DotNetUtils.isLdcI4(instrs[i + 1]) || DotNetUtils.getLdcI4Value(instrs[i + 1]) != 64)
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continue;
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if (instrs[i + 2].OpCode.Code != Code.Ldloca && instrs[i + 2].OpCode.Code != Code.Ldloca_S)
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continue;
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var call = instrs[i + 3];
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if (call.OpCode.Code != Code.Call)
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continue;
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var calledMethod = call.Operand as MethodDefinition;
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if (calledMethod == null || calledMethod.PInvokeInfo == null || calledMethod.PInvokeInfo.EntryPoint != "VirtualProtect")
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continue;
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if (instrs[i + 4].OpCode.Code != Code.Pop)
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continue;
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return true;
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var ldloc = instrs[i + 5];
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if (!DotNetUtils.isLdloc(ldloc))
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continue;
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var local = DotNetUtils.getLocalVar(method.Body.Variables, ldloc);
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if (local == null)
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continue;
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if (!DotNetUtils.isLdcI4(instrs[i + 6]) || DotNetUtils.getLdcI4Value(instrs[i + 6]) != 0)
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continue;
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if (instrs[i + 7].OpCode.Code != Code.Stind_I4)
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continue;
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ldloc = instrs[i + 8];
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if (!DotNetUtils.isLdloc(ldloc) || local != DotNetUtils.getLocalVar(method.Body.Variables, ldloc))
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continue;
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if (!DotNetUtils.isLdcI4(instrs[i + 9]) || DotNetUtils.getLdcI4Value(instrs[i + 9]) != 4)
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continue;
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return true;
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}
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return false;
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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_r58564:
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minRev = 58564;
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maxRev = 58817;
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return true;
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case ConfuserVersion.v14_r58852:
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minRev = 58852;
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maxRev = 67058;
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return true;
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case ConfuserVersion.v16_r69339:
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minRev = 69339;
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maxRev = 74637;
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return true;
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case ConfuserVersion.v17_r74708:
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minRev = 74708;
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maxRev = 75184;
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return true;
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case ConfuserVersion.v18_r75257:
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minRev = 75257;
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maxRev = 75720;
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return true;
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case ConfuserVersion.v19_r75725:
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minRev = 75725;
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maxRev = 76163;
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return true;
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case ConfuserVersion.v19_r76186:
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minRev = 76186;
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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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