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[求助]初学逆向，遇到个so文件感觉无从下手
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发表于: 2023-12-12 15:15
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论坛泡久了对逆向有点上瘾，奈何技术储备太浅，面对so文件时感觉很无力，特来求助一下，寻找一下思路，希望大佬们能指明一条学习路线
1.首先打开的是JNI_OnLoad文件，点击进入了off_5F9E8
2.根据java中入口方法_de_intercept，传入的是一个Lokhttp3/Interceptor$Chain对象，选择了sub_5BE6C
3点开qword_64828，qword_64830，sub_2A3D8，感觉如同看天书，没有任何头绪
qword_64828，qword_64830的代码如下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | __int64 v5; // x21 __int64 v6; // x0 __int64 v7; // x20 __int64 v8; // x21 __int64 v9; // x23 __int64 v10; // x24 __int64 v11; // x0 __int64 v12; // x0 _BYTE v13[12]; // [xsp+0h] [xbp-1A70h] BYREF char v14[28]; // [xsp+Ch] [xbp-1A64h] BYREF char dest[6720]; // [xsp+28h] [xbp-1A48h] BYREF __int64 v16; // [xsp+1A68h] [xbp-8h] v16 = *(_ReadStatusReg(ARM64_SYSREG(3, 3, 13, 0, 2)) + 40); if ( !qword_64828 ) { v1 = result; v2 = sub_5D63C(); memcpy(dest, &unk_1A924, sizeof(dest)); v3 = sub_2C368(v1, v2, dest, 6720LL, "/d1x4.dex"); v4 = qword_64810; v5 = v3; v6 = (*(*v1 + 1336LL))(v1, "cn.fxlcy.mh.mp"); v7 = sub_2A3D8(v1, v5, v4, v6); v8 = (*(*v1 + 264LL))(v1, v7, "<init>", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V"); __strlcpy_chk( v14, "ys6n2GvmgEyB3rELDX1gaTBf2pnB3NI2BhMN63Lte/nviZdVsu0uef4n4+XNuMk0Xgo63WLSTk0qcWhIZGxuyeZGfDRw8QzRrZ8feIe4aYqt3ihhZJP20bqYrGX/+s8qcpvdzYsg0Tu26HqkKNQXH+fYWLuf1iY9GmJ/mgyZUOt6Lr6+AReTHSQmwOdZHabAigZiO8SfbFZiad7XVhoYffoJg8DvVuVC9PIaoo6jXNQsElc5XXOnXICzoK6llWoOW2wMB53UJrcaC5n/RiLx4xUjfk5HwZ4K2iI4w7O3M9cMwH6JG4Sd8aiHoQXP02d+bALgI9O4jCOS1gugvXIfvwIDAQAB", 25LL, 25LL); v14[24] = 0; __strlcpy_chk( v13, "2pnB3NI2BhMN63Lte/nviZdVsu0uef4n4+XNuMk0Xgo63WLSTk0qcWhIZGxuyeZGfDRw8QzRrZ8feIe4aYqt3ihhZJP20bqYrGX/+s8qcpvdzYsg0Tu26HqkKNQXH+fYWLuf1iY9GmJ/mgyZUOt6Lr6+AReTHSQmwOdZHabAigZiO8SfbFZiad7XVhoYffoJg8DvVuVC9PIaoo6jXNQsElc5XXOnXICzoK6llWoOW2wMB53UJrcaC5n/RiLx4xUjfk5HwZ4K2iI4w7O3M9cMwH6JG4Sd8aiHoQXP02d+bALgI9O4jCOS1gugvXIfvwIDAQAB", 9LL, 9LL); v13[8] = 0; v9 = (*(*v1 + 1336LL))(v1, v14); v10 = (*(*v1 + 1336LL))(v1, v13); v11 = (*(*v1 + 1336LL))( v1, "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAys6n2GvmgEyB3rELDX1gaTBf2pnB3NI2BhMN63Lte/nviZdVsu0uef4n4+XNuMk0" "Xgo63WLSTk0qcWhIZGxuyeZGfDRw8QzRrZ8feIe4aYqt3ihhZJP20bqYrGX/+s8qcpvdzYsg0Tu26HqkKNQXH+fYWLuf1iY9GmJ/mgyZUOt6" "Lr6+AReTHSQmwOdZHabAigZiO8SfbFZiad7XVhoYffoJg8DvVuVC9PIaoo6jXNQsElc5XXOnXICzoK6llWoOW2wMB53UJrcaC5n/RiLx4xUj" "fk5HwZ4K2iI4w7O3M9cMwH6JG4Sd8aiHoQXP02d+bALgI9O4jCOS1gugvXIfvwIDAQAB"); v12 = sub_2C100(v1, v7, v8, v9, v10, v11); qword_64828 = (*(*v1 + 168LL))(v1, v12); qword_64830 = (*(*v1 + 264LL))(v1, v7, "i", "(Lokhttp3/Interceptor$Chain;)Lokhttp3/Response;"); qword_64838 = (*(*v1 + 264LL))(v1, v7, "pps", "(Ljava/lang/String;Z)[Ljava/lang/String;"); qword_64840 = (*(*v1 + 264LL))(v1, v7, "deb", "([B)[B"); result = (*(*v1 + 1720LL))(v1, v7, off_5FB38, 2LL); if ( result ) result = sub_5B59C(); byte_64848 = 1; } return result;} |
sub_2A3D8代码如下：
1 2 3 4 5 6 7 8 9 10 11 12 13 | __int64 sub_2A3D8(_JNIEnv *a1, void *a2, struct _jmethodID *a3, ...){ jobject (__fastcall *CallObjectMethodV)(JNIEnv *, jobject, jmethodID, va_list); // x8 gcc_va_list va1; // [xsp+B0h] [xbp-50h] BYREF gcc_va_list va; // [xsp+D8h] [xbp-28h] BYREF __int64 v7; // [xsp+F8h] [xbp-8h] va_start(va, a3); v7 = *(_ReadStatusReg(ARM64_SYSREG(3, 3, 13, 0, 2)) + 40); CallObjectMethodV = a1->functions->CallObjectMethodV; va_copy(va1, va); return CallObjectMethodV(&a1->functions, a2, a3, va1);} |
java入口文件代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | package cn.fxlcy.anative;import android.content.Context;import androidx.annotation.Keep;import java.io.IOException;import okhttp3.Interceptor;import okhttp3.Response;/* loaded from: classes.dex */public class Native { @Keep public static final Object ALOCK; /* renamed from: a reason: collision with root package name */ public static boolean f1145a; static { System.loadLibrary("fcore"); f1145a = true; ALOCK = new Object(); } public static native String _channel(); public static native Response _de_intercept(Interceptor.Chain chain) throws IOException; public static Response a(Interceptor.Chain chain) throws IOException { try { if (f1145a) { synchronized (ALOCK) { u_auth(); } f1145a = false; } Response _de_intercept = _de_intercept(chain); return _de_intercept == null ? chain.proceed(chain.request()) : _de_intercept; } catch (Throwable th) { if (th instanceof IOException) { throw th; } throw new IOException(th); } } public static native byte[] de(byte[] bArr); public static native String[] dra(String str, boolean z); public static native String gpk(); public static native String gqm(); public static native void init(Context context); public static native long system_currentTimeSeconds(); public static native void u_auth(); public static native String url_auth(String str);} |
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把那些Native函数的第一个参数类型设置成`JNIEnv*`就会清晰很多，比如`sub_2A3D8`它只是调用了`CallObjectMethodV`
至于`qword_64828`什么的，那是未初始化的全局变量，你可以按x找到写入的地方
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大佬，那个JNIload的函数如何加载正确的结构体函数呢 |
