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[原创]看雪3W4月第三题frida辅助尝试脱壳

2020-6-10 18:16 3283

[原创]看雪3W4月第三题frida辅助尝试脱壳

2020-6-10 18:16
3283

看雪培训脱壳4月第三题,爱加密的方法级别保护,方法的opcode被抽取后,替换成了一个静态方法,执行时调用静态方法修复opcode。
脱下来后发现是方法级别的保护,在ArtMethod::Invoke处方法还是没有修复。可以尝试在执行后或者在解释器中执行前拖opcode,我还没完全搞定。

 

解题过程:

  1. 拖进jdax看一下,爱加密

  2. 没有下载老师的脱壳机,先用手里的试试看。

        private void i() {
            H.i(6040);
        }
    
        /* access modifiers changed from: private */
        public void j() {
            H.i(6041);
        }
    
        /* access modifiers changed from: protected */
        public void b() {
            H.i(6031);
        }
    
        /* access modifiers changed from: protected */
        public void c() {
            aju.a = false;
            a((Application) this);
            h();
        }
    
        /* access modifiers changed from: protected */
        public void d() {
            H.i(6035);
        }
    
        public void e() {
            C1377e.a((Context) this).a((C1376d) new C1376d() {
                public void a(@Nullable String str) {
                    H.i(6023);
                }
    
                public void a(@NonNull String str, @NonNull String str2) {
                    H.i(6024);
                }
            });
        }
    

    看一下smali代码

        .registers 3
        .annotation system Ldalvik/annotation/Signature;
            value = {
                "(",
                "Ljava/lang/Class<",
                "*>;)Z"
            }
        .end annotation
    
        goto :goto_38
    
        :goto_1
        nop
    
        nop
    
        nop
    
        nop
    
        nop
    
        nop
    
        nop
    
        nop
    
        nop
    

    判断这种应该是将inis拖出来后,替换成一个java方法,在代码执行时候使用H.i方法对inis进行修复。

    下载fart尝试脱壳。

  3. 尝试使用frida对H.i函数进行直接调用。

    // app直接奔溃,有个大佬告诉我要注意堆栈的连续性,没懂
    var JavaH = Java.use("s.h.e.l.l.H");
    var JavaClass = Java.use("java.lang.Class");
    var JavaObject = Java.use("java.lang.Object");
    for (var i = 0; i < 9999; i++) {
        JavaH.i(i);
        console.log("call function H.i(" + i + ")");
    }
    
  4. 既然直接调用不行,就使用frida主动调用每个函数,来尝试获取修复后的dex。

    Java.perform(function () {
                var JavaDexFile = Java.use("dalvik.system.DexFile");
                var JavaH = Java.use("s.h.e.l.l.H");
                var JavaClass = Java.use("java.lang.Class");
                var JavaObject = Java.use("java.lang.Object");
                // for (var i = 0; i < 9999; i++) {
                //     JavaH.i(i);
                //     console.log("call function H.i(" + i + ")");
                // }
    
                // 1. 主动调用自己的脱壳机
                var JavaApkDumper = Java.use("android.app.ApkDumper");
                var JavaModifier = Java.use("java.lang.reflect.Modifier");
                var classLoaders = Java.enumerateClassLoadersSync();
                classLoaders.forEach(function (loader) {
                    if (loader.toString().indexOf("assistant") > -1) {
                        console.log("loader info->" + loader);
                        JavaApkDumper.threadDumpDex(loader, "com.xgtl.assistant");
                    }
                });
    
                // 2. 添加一个thread
                var JavaRunnable = Java.use("java.lang.Runnable");
                var JavaMethod = Java.use("java.lang.reflect.Method");
                var TestRunnable = Java.registerClass({
                    name: "com.ingeek.TestRunnable",
                    implements: [JavaRunnable],
                    fields: {
                        methodObject: 'java.lang.reflect.Method',
                        methodInvoke: 'java.lang.Object',
                        methodArgs: '[Ljava.lang.Object;'
                    },
                    methods: {
                        $init: [{
                            returnType: "void",
                            argumentTypes: ["java.lang.reflect.Method", "java.lang.Object", "[Ljava.lang.Object;"],
                            implementation: function (methodObj, methodInv, methodAs) {
                                this.methodObject = methodObj;
                                this.methodInvoke = methodInv;
                                this.methodArgs = methodAs;
                                console.log("TestRunnable cons is called!");
                            }
                        }],
                        run: [{
                            returnType: 'void',
                            implementation: function () {
                                try {
                                    Java.cast(this.methodObject, JavaMethod).invoke(this.methodInvoke, this.methodArgs);
                                } catch (e) {
                                    console.log("TestRunnable run error!", e);
                                }
    
                                console.log("TestRunnable run is called!");
                            }
                        }]
                    }
                });
    
                // console.log("TestRunnable", TestRunnable.$new(null, null, [null]).getClass().getDeclaredMethods(), TestRunnable.$new(null, null, [null]).getClass().getConstructors());
    
                // private void saveDexFilesToSDcard(Object cookie, String pkgname, ClassLoader mClassLoader)
                // JavaDexFile.saveDexFilesToSDcard.implementation = function (cookie, pkgname, loader) {
                //     console.log("test");
                //     var classnameArray = this.getClassNameList(cookie);
                //     classnameArray.forEach(function (classname) {
                //         try {
                //             this.loadClass(classname);
                //         } catch (e) {
                //             console.log("error classname->" + classname + "error info->" + e);
                //         }
                //     });
                //     this.saveDexFilesToSDcard(cookie, pkgname, loader);
                // }
    
                // private static native Class defineClassNative(String name, ClassLoader loader, Object cookie, DexFile dexFile)
                JavaDexFile.defineClassNative.implementation = function (name, loader, cookie, dexFile) {
                    var ret = this.defineClassNative(name, loader, cookie, dexFile);
                    // console.log("defineClassNative classname->" + name + ", ret is " + ret);
                    if (name.indexOf("android") == 0) {
                        // console.log("class name", name);
                    } else {
                        if (ret) {
                            console.log("class name", name);
                            var JavaClazzObject = Java.cast(ret, JavaClass);
                            var isAbstract = JavaModifier.isAbstract(JavaClazzObject.getModifiers());
                            var cons = JavaClazzObject.getConstructors();
                            var methods = JavaClazzObject.getDeclaredMethods();
                            var flag = false;
                            javaClassNameArray.forEach(function (classname) {
                                // console.log("filter class name", classname, "target class name", name);
                                if (name.indexOf(classname) == 0) {
                                    flag = true;
                                }
                            });
                            console.log("flag info", flag, "isAbstract", isAbstract);
                            if ((!isAbstract) && (!flag)) {
                                for (var i = 0; i < cons.length; i++) {
                                    var con = cons[i];
                                    var conName = con.getName();
                                    con.setAccessible(true);
                                    console.log("constructor name", conName, "argsLen", con.getParameterTypes().length);
                                    var argsLen = con.getParameterTypes().length;
                                    if (argsLen == 0) {
                                        try {
                                            //调用构造器后,构造器修复了。
                                            con.newInstance(null);
                                        } catch (e) {
                                            console.log("call cons error", e);
                                        }
                                    }
                                }
                                for (var i = 0; i < methods.length; i++) {
                                    var method = methods[i];
                                    if (!JavaModifier.isNative(method.getModifiers())) {
                                        var methodName = method.getName();
                                        var argsLen = method.getParameterTypes().length;
                                        var exceptionTypeLen = method.getExceptionTypes().length;
                                        console.log("method name", methodName, "argsLen", argsLen, "exceptionTypeLen", exceptionTypeLen);
                                        method.getParameterTypes().forEach(function (type) {
                                            console.log("method parameter type", type.getName());
                                        });
    
                                        method.setAccessible(true);
                                        // Java.vm.tryGetEnv().fromReflectedMethod(method);
    
                                        // if (JavaModifier.isStatic(method.getModifiers())) {
                                        // if (argsLen == 0) {
                                        // try {
                                        try {
                                            var argsArray = Java.array("java.lang.Object", null);
                                            console.log("call static method " + method.getName(), "method", method.getName(), "null", argsArray);
                                            var testRunnable = TestRunnable.$new(Java.cast(method, JavaMethod), null, argsArray);
                                            Java.use("java.lang.Thread").$new(testRunnable).start();
                                        } catch (e) {
                                            console.log("invoke method error~");
                                        }
                                        // method.invoke(null, Java.array("java.lang.Object", new Array(argsLen)));
                                        // } catch (e) {
                                        //     console.log("call static method error", e);
                                        // }
                                        // }
                                        // } else {
                                        //     try {
                                        //         console.log("call no static method " + method.getName());
                                        //         method.invoke(null, Java.array("java.lang.Object", new Array(argsLen)));
                                        //     } catch (e) {
                                        //         console.log("call no static method error", e);
                                        //     }
                                        //
                                        // }
    
                                    }
                                }
                            }
                        }
    
                    }
    
                    // Java.cast(ret, JavaClass).getConstructors().forEach(function (con) {
                    //     console.log("constructor info", con.getName());
                    //     try {
                    //         var argsLen = con.getParameterTypes().length;
                    //         var JavaObjectArray = Java.array("java.lang.Object", new Array(argsLen));
                    //         con.newInstance(JavaObjectArray);
                    //     } catch (e) {
                    //         console.log("invoke constructor error", e);
                    //     }
                    // });
    
                    // Java.cast(ret, JavaClass).getDeclaredMethods().forEach(function (method) {
                    //     console.log("method info", method.getName());
                    //     try{
                    //         var argsLen = method.getParameterTypes().length;
                    //         var JavaObjectArray = Java.array("java.lang.Object", new Array(argsLen));
                    //         method.invoke(null, JavaObjectArray);
                    //
                    //     }catch (e) {
                    //         console.log("invoke method error", e);
                    //     }
                    //
                    // });
                    return ret;
                }
            });
    
  5. 调用的时候出现了退出,查看后台报错,怀疑是有些特殊方法导致的退出,尝试添加类过滤。

    var javaClassNameArray = ["anet/channel/monitor/fivn",
        "anet/channel/monitor/b$a", "com/alipay/sdk/app/a",
        "com/baidu/mapapi/map/l$a", "com/alibaba/sdk/android/oss/network/ProgressTouchableRequestBody",
        "cn/smssdk/utils/SPHelper", "com/baidu/mapapi/map/Polyline",
        "anet/channel/AccsSessionManager", "com/baidu/mapapi/map/l$a",
        "com/alipay/sdk/app/H5PayActivity", "com/baidu/mapapi/map/offline/MKOfflineMap",
        "com/baidu/platform/comapi/map/s",
        "com/baidu/mapapi/UIMsg$UIOffType",
        "com/alibaba/sdk/android/oss/network/OSSRequestTask",
        "com/baidu/mapapi/search/core/RouteNode",
        "com/alipay/sdk/auth/k",
        "com/baidu/pano/platform/c/j",
        "com/liulishuo/okdownload/i",
        "com/baidu/mapapi/utils/route/IllegalRoutePlanArgumentException",
        "com/bumptech/glide/n",
        "com/baidu/platform/comapi/map/k",
        "com/baidu/vi/c",
        "com/baidu/mapapi/search/share/RouteShareURLOption$RouteShareMode",
        "com/baidu/mapapi/search/poi/PoiBoundSearchOption",
        "com/baidu/mapapi/search/share/LocationShareURLOption",
        "anet/channel/GlobalAppRuntimeInfo", "com/liulishuo/filedownloader/message/e",
        "com/bumptech/glide/R", "com/baidu/mapapi/search/route/MassTransitRoutePlanOption",
        "com/baidu/platform/comapi/commonutils/a", "com/baidu/platform/comapi/NativeLoader",
        "com/baidu/platform/comjni/engine/AppEngine",
        "com/liulishuo/filedownloader/message/SmallMessageSnapshot",
        "com/bumptech/glide/l", "com/baidu/mapframework/open/aidl/a$a$a",
        "com/baidu/mapapi/search/route/MassTransitRouteLine$TransitStep",
        "com/baidu/location/b/h", "com/baidu/mapapi/search/core/VehicleInfo",
        "com/baidu/mapapi/map/MapView", "com/baidu/mapapi/search/busline/BusLineResult",
        "com/baidu/location/c/e", "com/baidu/platform/comjni/util/JNIMD5",
        "com/baidu/location/Poi", "com/baidu/platform/util/a",
        "com/baidu/location/LocationClientOption", "com/baidu/mapapi/search/share/a",
        "com/baidu/mapapi/search/poi/PoiNearbySearchOption",
        "com/alibaba/sdk/android/oss/internal/ResponseParser",
        "com/baidu/mapapi/search", "com/baidu/mapapi/map/BaiduMap$OnMarkerClickListener",
        "com/alibaba/sdk/android/oss/internal/InternalRequestOperation$4",
        "com/baidu/location", "com/baidu/mapapi/search/route/WalkingRouteResult",
        "anetwork/channel/entity/c", "com/lody/virtual/server/content/b",
        "com/baidu/mapapi/cloud/CloudSearchResult",
        "anet/channel/entity/a", "com/baidu/mapapi/CoordType",
        "com/baidu/mapapi/map/MarkerOptions$MarkerAnimateType",
        "com/alibaba/sdk/android/oss/common/OSSLogToFileUtils$1",
        "com/baidu/lbsapi/tools/CoordinateConverter$COOR_TYPE",
        "com/alibaba/sdk/android/oss/common/auth/OSSStsTokenCredentialProvider",
        "com/baidu/location/c/e$c",
        "com/alibaba/sdk/android/oss/model/GetBucketACLResult",
        "com/baidu/lbsapi/auth/LBSAuthManager",
        "com/baidu/location/c/j", "com/baidu/location/c/j$a",
        "com/alibaba/sdk/android/oss/model",
        "com/baidu/location/c/a/d$b",
        "com/baidu/lbsapi/auth/c$a",
        "com/alibaba/sdk/android/oss/internal/ResponseParsers$ListPartsResponseParser",
        "com/alibaba/sdk/android/oss/internal/CheckCRC64DownloadInputStream",
        "com/baidu/location/c/e$b",
        "com/baidu/lbsapi/auth/l",
        "com/baidu/location/f/d$c",
        "com/baidu/pano/platform",
        "com/alibaba/sdk/android/oss/OSSImpl",
        "com/baidu/mapapi/cloud/CloudSearchResult",
        "com/baidu/location/g/a$a",
        "com/baidu/location/e/k$a",
        "com/baidu/location/a/h",
        "com/baidu/mapapi/model/c", "com/lody/virtual/client/stub/ShadowContentProvider$P18",
        "com/baidu/lbsapi/model/BaiduPanoData",
        "com/baidu/mapapi/map/UiSettings",
        "com/baidu/location/a/j",
        "com/alibaba/sdk", "com/baidu/platform/comapi/map/ai",
        "com/baidu/location/c/a/d", "com/lody/virtual/client/stub/ShadowActivity$P78",
        "com/lody/virtual/client/stub/ShadowActivity",
        "com/baidu/location/f/f", "com/baidu/mapapi/map/Dot",
        "cn/smssdk/b/a$1", "com/baidu/mapapi/search/route/TransitRouteLine$TransitStep",
        "anet/channel/strategy/dispatch",
        "com/baidu/location",
        "com/alibaba/sdk/android/oss/internal",
        "com/baidu/location/a/q",
        "com/baidu/mapapi/map/BaiduMap",
        "com/baidu/mapapi",
        "com/baidu/platform",
        "com/alibaba/sdk/android/oss/model",
        "com/lody/virtual/client",
        "com/liulishuo/filedownloader/services",
        "cn/smssdk/contact",
        "com/lody/virtual/client/stub/ShadowContentProvider",
        "com/baidu/platform/comjni/map/basemap/a",
        "com/baidu/mapapi/cloud/CloudManager",
        "com/alibaba/sdk/android/oss/OSSImpl",
        "com/baidu/mapapi/map/MapBaseIndoorMapInfo$SwitchFloorError",
        "com/baidu/mapapi/map/InfoWindow",
        "com/liulishuo/okdownload/g",
        "com/alipay/sdk/auth/AuthActivity",
        "cn/smssdk/net/b$a",
        "com/baidu/mapapi/map/PolylineOptions",
        "com/alibaba/sdk/android/oss/common/auth/OSSAuthCredentialsProvider",
        "com/bumptech/glide/k", "com/baidu/mapapi/search/geocode/GeoCodeResult",
        "cn/smssdk/net/a", "com/mob/MobCommunicator",
        "com/alibaba/sdk/android/oss/model/CompleteMultipartUploadRequest",
        "com/bumptech/glide/g", "com/lody/virtual/client/stub/ShadowDialogActivity$P65",
        "com/baidu/android/bbalbs/common/util/b",
        "anet/channel/util/StringUtils", "com/baidu/mapapi/map/q",
        "com/bumptech/glide/d", "com/lody/virtual/helper/b",
        "com/baidu/mapapi/map", "com/alipay/sdk/app/H5AuthActivity",
        "anet/channel/Config", "com/baidu/platform/comapi/map/j",
        "com/bumptech/glide", "com/baidu/platform/domain",
        "com/baidu/mapapi/search/route", "com/lody/virtual/client/stub/ShadowService$P65",
        "com/baidu/mapapi/map/BaiduMapOptions", "com/lody/virtual/client/stub/ShadowService",
        "com/baidu/pano/platform/c/f", "com/alibaba/sdk/android/oss/model/AbortMultipartUploadResult",
        "com/lody/virtual/remote/vloc/VLocation", "com/baidu/platform/comjni/map/radar/a",
        "com/baidu/mapapi/search/route/IndoorRouteLine", "com/baidu/mapapi/radar/RadarNearbySearchOption",
        "com/lody/virtual/client/stub/ShadowActivity$P44", "com/liulishuo/filedownloader/services/h",
        "com/baidu/location", "com/alipay/sdk/auth/j",
        "com/liulishuo/filedownloader/message/LargeMessageSnapshot$PendingMessageSnapshot", "com/baidu/location/a/q",
        "com/alipay/sdk/app/c", "com/baidu/mapapi/map/WearMapView", "com/liulishuo/filedownloader/model/FileDownloadTaskAtom",
        "com/baidu/platform/comapi/map/e$a", "com/lody/virtual/client/stub/ShadowDialogActivity",
        "com/baidu/mapapi/search/core/TrainInfo", "com/lody/virtual/client/stub", "com/lody/virtual/remote/InstallOptions",
        "com/alibaba/sdk/android/httpdns/g", "com/baidu/lbsapi/auth/e", "com/baidu/mapframework/open/aidl/IComOpenClient",
        "anetwork/channel/aidl/DefaultProgressEvent", "com/baidu/mapapi/utils/poi/IllegalPoiSearchArgumentException",
        "com/baidu/platform/comjni/map/commonmemcache/a", "com/alipay/sdk/app/d$a", "com/baidu/pano/platform/a/a/a",
        "com/baidu/mapapi/navi/NaviParaOption",
        "com/baidu/mapapi/map/n", "com/alibaba/sdk/android/oss/network/ExecutionContext",
        "com/baidu/vi/b", "com/baidu/mapapi/search/busline/OnGetBusLineSearchResultListener",
        "com/baidu/location/e/c", "com/baidu/mapapi/search/core/TransitResultNode", "anetwork/channel/aidl/h$a$a",
        "anet/channel/util/g", "com/baidu/location/c/e$c", "cn/smssdk/utils/a", "anet/channel/Config$Builder",
        "com/baidu/location/e/d$b", "com/baidu/pano/platform/a/a/e$b", "com/baidu/location/BDLocationListener",
        "com/liulishuo/filedownloader/model/FileDownloadModel", "com/alibaba/sdk/android/oss/model",
        "com/baidu/mapapi/map/offline", "com/baidu/mapapi/navi/BaiduMapNavigation",
        "com/baidu/mapapi/map/m", "com/baidu/mapapi/utils/CoordinateConverter", "anet/channel/util/ALog",
        "anet/channel/strategy/dispatch", "com/alibaba/sdk/android/oss/internal/ResumableUploadTask",
        "com/baidu/mapapi/map/WearMapView", "com/baidu/mapapi/search/poi/PoiIndoorResult"];
    
  6. 增加的太多了,还是没有有效解决退出的问题,思考是否可以像老师教的那样通过阻断函数执行来解决问题。

    通过查看源码。

    // java_lang_reflect_Method.cc
    static jobject Method_invoke(JNIEnv* env, jobject javaMethod, jobject javaReceiver,
                                 jobject javaArgs) {
      ScopedFastNativeObjectAccess soa(env);
      return InvokeMethod(soa, javaMethod, javaReceiver, javaArgs);
    }
    
    // reflection.cc
     jobject InvokeMethod(const ScopedObjectAccessAlreadyRunnable& soa, jobject javaMethod,
                         jobject javaReceiver, jobject javaArgs, size_t num_frames) {
    ......
      // 比较了参数个数
      if (arg_count != classes_size) {
        ThrowIllegalArgumentException(StringPrintf("Wrong number of arguments; expected %d, got %d",
                                                   classes_size, arg_count).c_str());
        return nullptr;
      }
    ......
    
      // 调用了这里
      InvokeWithArgArray(soa, m, &arg_array, &result, shorty);
    ...... 
    }
    
    // reflection.cc
    static void InvokeWithArgArray(const ScopedObjectAccessAlreadyRunnable& soa,
                                   ArtMethod* method, ArgArray* arg_array, JValue* result,
                                   const char* shorty)
        REQUIRES_SHARED(Locks::mutator_lock_) {
      uint32_t* args = arg_array->GetArray();
      if (UNLIKELY(soa.Env()->check_jni)) {
        CheckMethodArguments(soa.Vm(), method->GetInterfaceMethodIfProxy(kRuntimePointerSize), args);
      }
      // 调用了这里
      method->Invoke(soa.Self(), args, arg_array->GetNumBytes(), result, shorty);
    }
    
    // art_method.cc
    
    void ArtMethod::Invoke(Thread* self, uint32_t* args, uint32_t args_size, JValue* result,
                           const char* shorty) {
    
      // 自己觉得这里dump可以了,后来老师指点了一下,还是需要深入的。
      if (UNLIKELY(__builtin_frame_address(0) < self->GetStackEnd())) {
        ThrowStackOverflowError(self);
        return;
      }
    ......
      if (!IsStatic()) {
              (*art_quick_invoke_stub)(this, args, args_size, self, result, shorty);
            } else {
              (*art_quick_invoke_static_stub)(this, args, args_size, self, result, shorty);
            }
    ......
    }
    
    // https://www.jianshu.com/p/2ff1b63f686b
    // https://www.cnblogs.com/lanrenxinxin/p/5207174.html
    // 加固的app都是用Interpreter解释执行的,所以我们看看这个函数
    void EnterInterpreterFromInvoke(Thread* self,
                                      ArtMethod* method,
                                      ObjPtr<mirror::Object> receiver,
                                      uint32_t* args,
                                      JValue* result,
                                      bool stay_in_interpreter) {
        ......
        if (LIKELY(!method->IsNative())) {
          JValue r = Execute(self, code_item, *shadow_frame, JValue(), stay_in_interpreter);
          if (result != nullptr) {
            *result = r;
          }
        ......
    }
    
    // Execute函数
    static inline JValue Execute(
        Thread* self,
        const DexFile::CodeItem* code_item,
        ShadowFrame& shadow_frame,
        JValue result_register,
        bool stay_in_interpreter = false) REQUIRES_SHARED(Locks::mutator_lock_) {
      DCHECK(!shadow_frame.GetMethod()->IsAbstract());
      DCHECK(!shadow_frame.GetMethod()->IsNative());
      if (LIKELY(shadow_frame.GetDexPC() == 0)) { 
    
    // 看一下android的解释器:
    // 在android8.1下面,解释器为两种:Switch解释器与汇编解释器:
    // art/runtime/interpreter/interpreter.cc 默认配置的是汇编解释器,我们如果要对方法级别的保护做dump的话,需要在这里修改,然后dump opcode,如果是arm的话,修改起来比较难,我们可以修改为switch解释器,然后再尝试修改dump opcode。
    enum InterpreterImplKind {
      kSwitchImplKind,        // Switch-based interpreter implementation.
      kMterpImplKind          // Assembly interpreter
    };
    - static constexpr InterpreterImplKind kInterpreterImplKind = kMterpImplKind;
    + static constexpr InterpreterImplKind kInterpreterImplKind = kSwitchImplKind;
    
    // 然后看/art/runtime/interpreter/interpreter_switch_impl.cc这个文件
    // 其中的参数self表示当前线程,shadow_frame类似于java虚拟机中的stack frame,用于存储方法中的本地变量表、操作栈方法出口等信息。
    template<bool do_access_check, bool transaction_active>
    JValue ExecuteSwitchImpl(Thread* self, const DexFile::CodeItem* code_item,
                             ShadowFrame& shadow_frame, JValue result_register,
                             bool interpret_one_instruction) {
    ......
      ArtMethod* method = shadow_frame.GetMethod();
      //在这里dump opcode,抄一下老师的dumpDexFileByExecute方法。
      jit::Jit* jit = Runtime::Current()->GetJit();
    ......
    }
    

    分析到这里,基本就可以修改函数,炒一炒老师的代码,完成脱壳了,这部分就需要我修改源码了,慢慢改。

  7. 附上我写的完整的frida脚本,没有拖出来完整的dex。

   /**
    * frida -H 127.0.0.1:1337 -f com.xgtl.assistant -l hook_kanxue03.js --no-pause
    *
    */
   function hook() {
       hook_java();
       hook_native();
   }

   var javaClassNameArray = ["anet/channel/monitor/fivn",
       "anet/channel/monitor/b$a", "com/alipay/sdk/app/a",
       "com/baidu/mapapi/map/l$a", "com/alibaba/sdk/android/oss/network/ProgressTouchableRequestBody",
       "cn/smssdk/utils/SPHelper", "com/baidu/mapapi/map/Polyline",
       "anet/channel/AccsSessionManager", "com/baidu/mapapi/map/l$a",
       "com/alipay/sdk/app/H5PayActivity", "com/baidu/mapapi/map/offline/MKOfflineMap",
       "com/baidu/platform/comapi/map/s",
       "com/baidu/mapapi/UIMsg$UIOffType",
       "com/alibaba/sdk/android/oss/network/OSSRequestTask",
       "com/baidu/mapapi/search/core/RouteNode",
       "com/alipay/sdk/auth/k",
       "com/baidu/pano/platform/c/j",
       "com/liulishuo/okdownload/i",
       "com/baidu/mapapi/utils/route/IllegalRoutePlanArgumentException",
       "com/bumptech/glide/n",
       "com/baidu/platform/comapi/map/k",
       "com/baidu/vi/c",
       "com/baidu/mapapi/search/share/RouteShareURLOption$RouteShareMode",
       "com/baidu/mapapi/search/poi/PoiBoundSearchOption",
       "com/baidu/mapapi/search/share/LocationShareURLOption",
       "anet/channel/GlobalAppRuntimeInfo", "com/liulishuo/filedownloader/message/e",
       "com/bumptech/glide/R", "com/baidu/mapapi/search/route/MassTransitRoutePlanOption",
       "com/baidu/platform/comapi/commonutils/a", "com/baidu/platform/comapi/NativeLoader",
       "com/baidu/platform/comjni/engine/AppEngine",
       "com/liulishuo/filedownloader/message/SmallMessageSnapshot",
       "com/bumptech/glide/l", "com/baidu/mapframework/open/aidl/a$a$a",
       "com/baidu/mapapi/search/route/MassTransitRouteLine$TransitStep",
       "com/baidu/location/b/h", "com/baidu/mapapi/search/core/VehicleInfo",
       "com/baidu/mapapi/map/MapView", "com/baidu/mapapi/search/busline/BusLineResult",
       "com/baidu/location/c/e", "com/baidu/platform/comjni/util/JNIMD5",
       "com/baidu/location/Poi", "com/baidu/platform/util/a",
       "com/baidu/location/LocationClientOption", "com/baidu/mapapi/search/share/a",
       "com/baidu/mapapi/search/poi/PoiNearbySearchOption",
       "com/alibaba/sdk/android/oss/internal/ResponseParser",
       "com/baidu/mapapi/search", "com/baidu/mapapi/map/BaiduMap$OnMarkerClickListener",
       "com/alibaba/sdk/android/oss/internal/InternalRequestOperation$4",
       "com/baidu/location", "com/baidu/mapapi/search/route/WalkingRouteResult",
       "anetwork/channel/entity/c", "com/lody/virtual/server/content/b",
       "com/baidu/mapapi/cloud/CloudSearchResult",
       "anet/channel/entity/a", "com/baidu/mapapi/CoordType",
       "com/baidu/mapapi/map/MarkerOptions$MarkerAnimateType",
       "com/alibaba/sdk/android/oss/common/OSSLogToFileUtils$1",
       "com/baidu/lbsapi/tools/CoordinateConverter$COOR_TYPE",
       "com/alibaba/sdk/android/oss/common/auth/OSSStsTokenCredentialProvider",
       "com/baidu/location/c/e$c",
       "com/alibaba/sdk/android/oss/model/GetBucketACLResult",
       "com/baidu/lbsapi/auth/LBSAuthManager",
       "com/baidu/location/c/j", "com/baidu/location/c/j$a",
       "com/alibaba/sdk/android/oss/model",
       "com/baidu/location/c/a/d$b",
       "com/baidu/lbsapi/auth/c$a",
       "com/alibaba/sdk/android/oss/internal/ResponseParsers$ListPartsResponseParser",
       "com/alibaba/sdk/android/oss/internal/CheckCRC64DownloadInputStream",
       "com/baidu/location/c/e$b",
       "com/baidu/lbsapi/auth/l",
       "com/baidu/location/f/d$c",
       "com/baidu/pano/platform",
       "com/alibaba/sdk/android/oss/OSSImpl",
       "com/baidu/mapapi/cloud/CloudSearchResult",
       "com/baidu/location/g/a$a",
       "com/baidu/location/e/k$a",
       "com/baidu/location/a/h",
       "com/baidu/mapapi/model/c", "com/lody/virtual/client/stub/ShadowContentProvider$P18",
       "com/baidu/lbsapi/model/BaiduPanoData",
       "com/baidu/mapapi/map/UiSettings",
       "com/baidu/location/a/j",
       "com/alibaba/sdk", "com/baidu/platform/comapi/map/ai",
       "com/baidu/location/c/a/d", "com/lody/virtual/client/stub/ShadowActivity$P78",
       "com/lody/virtual/client/stub/ShadowActivity",
       "com/baidu/location/f/f", "com/baidu/mapapi/map/Dot",
       "cn/smssdk/b/a$1", "com/baidu/mapapi/search/route/TransitRouteLine$TransitStep",
       "anet/channel/strategy/dispatch",
       "com/baidu/location",
       "com/alibaba/sdk/android/oss/internal",
       "com/baidu/location/a/q",
       "com/baidu/mapapi/map/BaiduMap",
       "com/baidu/mapapi",
       "com/baidu/platform",
       "com/alibaba/sdk/android/oss/model",
       "com/lody/virtual/client",
       "com/liulishuo/filedownloader/services",
       "cn/smssdk/contact",
       "com/lody/virtual/client/stub/ShadowContentProvider",
       "com/baidu/platform/comjni/map/basemap/a",
       "com/baidu/mapapi/cloud/CloudManager",
       "com/alibaba/sdk/android/oss/OSSImpl",
       "com/baidu/mapapi/map/MapBaseIndoorMapInfo$SwitchFloorError",
       "com/baidu/mapapi/map/InfoWindow",
       "com/liulishuo/okdownload/g",
       "com/alipay/sdk/auth/AuthActivity",
       "cn/smssdk/net/b$a",
       "com/baidu/mapapi/map/PolylineOptions",
       "com/alibaba/sdk/android/oss/common/auth/OSSAuthCredentialsProvider",
       "com/bumptech/glide/k", "com/baidu/mapapi/search/geocode/GeoCodeResult",
       "cn/smssdk/net/a", "com/mob/MobCommunicator",
       "com/alibaba/sdk/android/oss/model/CompleteMultipartUploadRequest",
       "com/bumptech/glide/g", "com/lody/virtual/client/stub/ShadowDialogActivity$P65",
       "com/baidu/android/bbalbs/common/util/b",
       "anet/channel/util/StringUtils", "com/baidu/mapapi/map/q",
       "com/bumptech/glide/d", "com/lody/virtual/helper/b",
       "com/baidu/mapapi/map", "com/alipay/sdk/app/H5AuthActivity",
       "anet/channel/Config", "com/baidu/platform/comapi/map/j",
       "com/bumptech/glide", "com/baidu/platform/domain",
       "com/baidu/mapapi/search/route", "com/lody/virtual/client/stub/ShadowService$P65",
       "com/baidu/mapapi/map/BaiduMapOptions", "com/lody/virtual/client/stub/ShadowService",
       "com/baidu/pano/platform/c/f", "com/alibaba/sdk/android/oss/model/AbortMultipartUploadResult",
       "com/lody/virtual/remote/vloc/VLocation", "com/baidu/platform/comjni/map/radar/a",
       "com/baidu/mapapi/search/route/IndoorRouteLine", "com/baidu/mapapi/radar/RadarNearbySearchOption",
       "com/lody/virtual/client/stub/ShadowActivity$P44", "com/liulishuo/filedownloader/services/h",
       "com/baidu/location", "com/alipay/sdk/auth/j",
       "com/liulishuo/filedownloader/message/LargeMessageSnapshot$PendingMessageSnapshot", "com/baidu/location/a/q",
       "com/alipay/sdk/app/c", "com/baidu/mapapi/map/WearMapView", "com/liulishuo/filedownloader/model/FileDownloadTaskAtom",
       "com/baidu/platform/comapi/map/e$a", "com/lody/virtual/client/stub/ShadowDialogActivity",
       "com/baidu/mapapi/search/core/TrainInfo", "com/lody/virtual/client/stub", "com/lody/virtual/remote/InstallOptions",
       "com/alibaba/sdk/android/httpdns/g", "com/baidu/lbsapi/auth/e", "com/baidu/mapframework/open/aidl/IComOpenClient",
       "anetwork/channel/aidl/DefaultProgressEvent", "com/baidu/mapapi/utils/poi/IllegalPoiSearchArgumentException",
       "com/baidu/platform/comjni/map/commonmemcache/a", "com/alipay/sdk/app/d$a", "com/baidu/pano/platform/a/a/a",
       "com/baidu/mapapi/navi/NaviParaOption",
       "com/baidu/mapapi/map/n", "com/alibaba/sdk/android/oss/network/ExecutionContext",
       "com/baidu/vi/b", "com/baidu/mapapi/search/busline/OnGetBusLineSearchResultListener",
       "com/baidu/location/e/c", "com/baidu/mapapi/search/core/TransitResultNode", "anetwork/channel/aidl/h$a$a",
       "anet/channel/util/g", "com/baidu/location/c/e$c", "cn/smssdk/utils/a", "anet/channel/Config$Builder",
       "com/baidu/location/e/d$b", "com/baidu/pano/platform/a/a/e$b", "com/baidu/location/BDLocationListener",
       "com/liulishuo/filedownloader/model/FileDownloadModel", "com/alibaba/sdk/android/oss/model",
       "com/baidu/mapapi/map/offline", "com/baidu/mapapi/navi/BaiduMapNavigation",
       "com/baidu/mapapi/map/m", "com/baidu/mapapi/utils/CoordinateConverter", "anet/channel/util/ALog",
       "anet/channel/strategy/dispatch", "com/alibaba/sdk/android/oss/internal/ResumableUploadTask",
       "com/baidu/mapapi/map/WearMapView", "com/baidu/mapapi/search/poi/PoiIndoorResult"];

   function hook_java() {
       if (Java.available) {
           Java.perform(function () {
               // var JavaDexFile = Java.use("dalvik.system.DexFile");
               // JavaDexFile.loadClass.implementation = function (classname, loader) {
               //     var ret = this.loadClass(classname, loader);
               //     console.log("loadClass classname->" + classname);
               //     return ret;
               // }
               console.log("yes");
           });
       }
   }

   function register_class() {
       if (Java.available) {
           Java.perform(function () {
               // 2. 添加一个thread
               var JavaRunnable = Java.use("java.lang.Runnable");
               var TestRunnable = Java.registerClass({
                   name: 'com.ingeek.TestRunnable',
                   implements: [JavaRunnable],
                   fields: {
                       methodObject: 'java.lang.reflect.Method',
                       methodInvoke: 'java.lang.Object',
                       methodArgs: '[Ljava.lang.Object;'
                   },
                   methods: {
                       $init: function () {
                           console.log("TestRunnable new args 0 ");
                       },
                       $init: function (methodObject, methodInvoke, methodArgs) {
                           this.methodObject = methodObject;
                           this.methodInvoke = methodInvoke;
                           this.methodArgs = methodArgs;
                           console.log("methodObject", this.methodObject.getName(), "methodInvoke", this.methodInvoke.getName(), "methodArgs", this.methodArgs.length)
                       },
                       run: function () {
                           invokeMethod();
                       },
                       invokeMethod: function () {
                           methodObject.invoke(methodInvoke, methodArgs);
                       }
                   }
               });
           });
       }
   }

   // function hook_test() {
   //     if (Java.available) {
   //         Java.perform(function () {
   //             // var JavaTestRunnable = Java.use("com.ingeek.TestRunnable");
   //             var JavaClass = Java.use("java.lang.Class");
   //             var JavaTestRunnable = JavaClass.forName("com.ingeek.TestRunnable");
   //             var methods = JavaTestRunnable.getDeclaredMethods();
   //             methods.forEach(function (method) {
   //                 console.log("method " + method.getName());
   //             });
   //             JavaTestRunnable.$init.implementation = function (a1, a2) {
   //                 return this.$init(a1, a2);
   //             }
   //         });
   //     }
   // }


   function hook_call() {
       if (Java.available) {
           Java.perform(function () {
               var JavaDexFile = Java.use("dalvik.system.DexFile");
               var JavaH = Java.use("s.h.e.l.l.H");
               var JavaClass = Java.use("java.lang.Class");
               var JavaObject = Java.use("java.lang.Object");
               // for (var i = 0; i < 9999; i++) {
               //     JavaH.i(i);
               //     console.log("call function H.i(" + i + ")");
               // }

               // 1. 主动调用自己的脱壳机
               var JavaApkDumper = Java.use("android.app.ApkDumper");
               var JavaModifier = Java.use("java.lang.reflect.Modifier");
               var classLoaders = Java.enumerateClassLoadersSync();
               classLoaders.forEach(function (loader) {
                   if (loader.toString().indexOf("assistant") > -1) {
                       console.log("loader info->" + loader);
                       JavaApkDumper.threadDumpDex(loader, "com.xgtl.assistant");
                   }
               });

               // 2. 添加一个thread
               var JavaRunnable = Java.use("java.lang.Runnable");
               var JavaMethod = Java.use("java.lang.reflect.Method");
               var TestRunnable = Java.registerClass({
                   name: "com.ingeek.TestRunnable",
                   implements: [JavaRunnable],
                   fields: {
                       methodObject: 'java.lang.reflect.Method',
                       methodInvoke: 'java.lang.Object',
                       methodArgs: '[Ljava.lang.Object;'
                   },
                   methods: {
                       $init: [{
                           returnType: "void",
                           argumentTypes: ["java.lang.reflect.Method", "java.lang.Object", "[Ljava.lang.Object;"],
                           implementation: function (methodObj, methodInv, methodAs) {
                               this.methodObject = methodObj;
                               this.methodInvoke = methodInv;
                               this.methodArgs = methodAs;
                               console.log("TestRunnable cons is called!");
                           }
                       }],
                       run: [{
                           returnType: 'void',
                           implementation: function () {
                               try {
                                   Java.cast(this.methodObject, JavaMethod).invoke(this.methodInvoke, this.methodArgs);
                               } catch (e) {
                                   console.log("TestRunnable run error!", e);
                               }

                               console.log("TestRunnable run is called!");
                           }
                       }]
                   }
               });

               // console.log("TestRunnable", TestRunnable.$new(null, null, [null]).getClass().getDeclaredMethods(), TestRunnable.$new(null, null, [null]).getClass().getConstructors());


               // private void saveDexFilesToSDcard(Object cookie, String pkgname, ClassLoader mClassLoader)
               // JavaDexFile.saveDexFilesToSDcard.implementation = function (cookie, pkgname, loader) {
               //     console.log("test");
               //     var classnameArray = this.getClassNameList(cookie);
               //     classnameArray.forEach(function (classname) {
               //         try {
               //             this.loadClass(classname);
               //         } catch (e) {
               //             console.log("error classname->" + classname + "error info->" + e);
               //         }
               //     });
               //     this.saveDexFilesToSDcard(cookie, pkgname, loader);
               // }

               // private static native Class defineClassNative(String name, ClassLoader loader, Object cookie, DexFile dexFile)
               JavaDexFile.defineClassNative.implementation = function (name, loader, cookie, dexFile) {
                   var ret = this.defineClassNative(name, loader, cookie, dexFile);
                   // console.log("defineClassNative classname->" + name + ", ret is " + ret);
                   if (name.indexOf("android") == 0) {
                       // console.log("class name", name);
                   } else {
                       if (ret) {
                           console.log("class name", name);
                           var JavaClazzObject = Java.cast(ret, JavaClass);
                           var isAbstract = JavaModifier.isAbstract(JavaClazzObject.getModifiers());
                           var cons = JavaClazzObject.getConstructors();
                           var methods = JavaClazzObject.getDeclaredMethods();
                           var flag = false;
                           javaClassNameArray.forEach(function (classname) {
                               // console.log("filter class name", classname, "target class name", name);
                               if (name.indexOf(classname) == 0) {
                                   flag = true;
                               }
                           });
                           console.log("flag info", flag, "isAbstract", isAbstract);
                           if ((!isAbstract) && (!flag)) {
                               for (var i = 0; i < cons.length; i++) {
                                   var con = cons[i];
                                   var conName = con.getName();
                                   con.setAccessible(true);
                                   console.log("constructor name", conName, "argsLen", con.getParameterTypes().length);
                                   var argsLen = con.getParameterTypes().length;
                                   if (argsLen == 0) {
                                       try {
                                           con.newInstance(null);
                                       } catch (e) {
                                           console.log("call cons error", e);
                                       }
                                   }
                               }
                               for (var i = 0; i < methods.length; i++) {
                                   var method = methods[i];
                                   if (!JavaModifier.isNative(method.getModifiers())) {
                                       var methodName = method.getName();
                                       var argsLen = method.getParameterTypes().length;
                                       var exceptionTypeLen = method.getExceptionTypes().length;
                                       console.log("method name", methodName, "argsLen", argsLen, "exceptionTypeLen", exceptionTypeLen);
                                       method.getParameterTypes().forEach(function (type) {
                                           console.log("method parameter type", type.getName());
                                       });

                                       method.setAccessible(true);
                                       // 从frida这里fromReflectedMethod看一下是不是修复了。
                                       // Java.vm.tryGetEnv().fromReflectedMethod(method);

                                       // if (JavaModifier.isStatic(method.getModifiers())) {
                                       // if (argsLen == 0) {
                                       // try {


                                       try {
                                           var argsArray = Java.array("java.lang.Object", null);
                                           console.log("call static method " + method.getName(), "method", method.getName(), "null", argsArray);
                                           var testRunnable = TestRunnable.$new(Java.cast(method, JavaMethod), null, argsArray);
                                           Java.use("java.lang.Thread").$new(testRunnable).start();
                                       } catch (e) {
                                           console.log("invoke method error~");
                                       }
                                       // method.invoke(null, Java.array("java.lang.Object", new Array(argsLen)));
                                       // } catch (e) {
                                       //     console.log("call static method error", e);
                                       // }
                                       // }


                                       // } else {
                                       //     try {
                                       //         console.log("call no static method " + method.getName());
                                       //         method.invoke(null, Java.array("java.lang.Object", new Array(argsLen)));
                                       //     } catch (e) {
                                       //         console.log("call no static method error", e);
                                       //     }
                                       //
                                       // }

                                   }
                               }
                           }
                       }

                   }

                   // Java.cast(ret, JavaClass).getConstructors().forEach(function (con) {
                   //     console.log("constructor info", con.getName());
                   //     try {
                   //         var argsLen = con.getParameterTypes().length;
                   //         var JavaObjectArray = Java.array("java.lang.Object", new Array(argsLen));
                   //         con.newInstance(JavaObjectArray);
                   //     } catch (e) {
                   //         console.log("invoke constructor error", e);
                   //     }
                   // });

                   // Java.cast(ret, JavaClass).getDeclaredMethods().forEach(function (method) {
                   //     console.log("method info", method.getName());
                   //     try{
                   //         var argsLen = method.getParameterTypes().length;
                   //         var JavaObjectArray = Java.array("java.lang.Object", new Array(argsLen));
                   //         method.invoke(null, JavaObjectArray);
                   //
                   //     }catch (e) {
                   //         console.log("invoke method error", e);
                   //     }
                   //
                   // });
                   return ret;
               }
           });
       }
   }

   function hook_native() {
       console.log("hook native");
       var artmethodInvoke = Module.findExportByName('libart.so', "_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc");
       console.log("artmethodInvoke addr " + artmethodInvoke);
       Interceptor.attach(artmethodInvoke, {
           onEnter: function (args) {
               console.log("artmethod name", ptr(this.context.r0).GetName());
           },
           onLeave: function (retval) {

           }
       });
   }

   setTimeout(hook, 0);

寒冰大佬太强了, 提醒我在ArtMethod::Invoke中artmethod执行完之后,把opcode脱下来,可惜自己代码能力太弱了,一时半会也写不出来,慢慢来吧。



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最后于 2020-6-10 18:16 被新萌编辑 ,原因:
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无敌得我 活跃值 2020-6-10 19:56
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我新发的改版fart就是做这个题写的
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