Android逆向—苏宁金融app的data参数分析

一、用工具抓包

二、分析apk是否加壳

没有加壳,直接用jadx打开分析
查找data=参数

文件:su_ning_jin_rong.js

复制Java.perform(function () {
    var encrypt1 = Java.use("org.bouncycastle.crypto.engines.SM2Engine");
    console.log(encrypt1);
    encrypt1.encrypt.overload('[B', 'int', 'int').implementation = function (args1,args2,args3) {
        console.log("args1-1", args1,args2,args3);
        //JS输出内容为[object Object]  转换成数组,然后转换成字节
        console.log(JSON.stringify(args1),args2,args3)
        var args = this.encrypt(args1,args2,args3);
        console.log("args-1", args);
        return args
    }
});

三、用Frida HOOK 登录入参数

复制# -*- coding: utf-8 -*-

import logging
import frida
import sys
logging.basicConfig(level=logging.DEBUG)

def on_message(message, data):
    print(message)

with open('su_ning_jin_rong.js', 'r', encoding='utf-8') as f:
    sta = ''.join(f.readlines())

rdev = frida.get_remote_device()
processes = rdev.enumerate_processes()  # 安卓手机中的所有进程
print(processes)
# android.content.Intent android.content.Context android.view.ViewGroup  java.lang.String, java.util.List  [Ljava.lang.String;(String[])， javax.net.ssl.SSLSession  SSLSession
session = rdev.attach("com.suning.mobile.epa")
print(session)
script = session.create_script(sta)

script.on("message", on_message)
script.load()
sys.stdin.read()

四、用Frida HOOK SM2 公钥

复制Java.perform(function () {
    var encrypt1 = Java.use("k.a.a.a.a.a");
    console.log(encrypt1);
    encrypt1.b.overload('java.lang.String', '[B', '[B').implementation = function (args1,args2,args3) {
        console.log("args1-1", args1, args2, args3);
        //JS输出内容为[object Object]  转换成数组,然后转换成字节
        // console.log(JSON.stringify(args1),args2,args3)
        console.log(args1)
        console.log(JSON.stringify(args2))
        console.log(JSON.stringify(args3))

        var args = this.b(args1,args2,args3);
        console.log("args-1:", args);
        return args
    }
});

复制import logging
import frida
import sys

logging.basicConfig(level=logging.DEBUG)


def on_message(message, data):
    print(message)


with open('su_ning_jin_rong_key.js', 'r', encoding='utf-8') as f:
    sta = ''.join(f.readlines())

rdev = frida.get_remote_device()
processes = rdev.enumerate_processes()  # 安卓手机中的所有进程
print(processes)
# android.content.Intent android.content.Context android.view.ViewGroup  java.lang.String, java.util.List  [Ljava.lang.String;(String[])， javax.net.ssl.SSLSession  SSLSession
session = rdev.attach("com.suning.mobile.epa")
print(session)
script = session.create_script(sta)

script.on("message", on_message)
script.load()
sys.stdin.read()

五、安装gmssl

pip install gmssl

复制import binascii
import json
from gmssl import sm2

public_key = '47882F6B93CE57EA6903DEE9387E1BDC6D42763EFF2D93167FE92CD1D0A9C31A3D20BC796A0D7C60003BDDF3DF2C841F4E78C36A25720DFD44E9991490770AF4'
sm2_crypt = sm2.CryptSM2(public_key=public_key, private_key='')
data = json.dumps({"mobileNo": "13899999999", "sceneId": "FTIS-M-001"}, separators=(',', ':')).encode()

enc_data = sm2_crypt.encrypt(data)
result = binascii.b2a_hex(enc_data).upper().decode()
print(result)

a=[123,34,109,111,98,105,108,101,78,111,34,58,34,49,51,57,49,56,50,51,56,51,52,52,34,44,34,115,99,101,110,101,73,100,34,58,34,70,84,73,83,45,77,45,48,48,49,34,125]
print(bytes(a))

六、获取公钥public_key

JS文件:su_ning_jin_rong_key.js

复制Java.perform(function () {
    var encrypt1 = Java.use("k.a.a.a.a.a");
    console.log(encrypt1);
    encrypt1.b.overload('java.lang.String', '[B', '[B').implementation = function (args1,args2,args3) {
        console.log("args1-1", args1, args2, args3);
        //JS输出内容为[object Object]  转换成数组,然后转换成字节
        // console.log(JSON.stringify(args1),args2,args3)
        console.log(args1)
        console.log(JSON.stringify(args2))
        console.log(JSON.stringify(args3))

        var args = this.b(args1,args2,args3);
        console.log("args-1:", args);
        return args
    }
});

七、HOOK 公钥public_key

复制import logging
import frida
import sys

logging.basicConfig(level=logging.DEBUG)


def on_message(message, data):
    print(message)


with open('su_ning_jin_rong_key.js', 'r', encoding='utf-8') as f:
    sta = ''.join(f.readlines())

rdev = frida.get_remote_device()
processes = rdev.enumerate_processes()  # 安卓手机中的所有进程
print(processes)
# android.content.Intent android.content.Context android.view.ViewGroup  java.lang.String, java.util.List  [Ljava.lang.String;(String[])， javax.net.ssl.SSLSession  SSLSession
session = rdev.attach("com.suning.mobile.epa")
print(session)
script = session.create_script(sta)

script.on("message", on_message)
script.load()
sys.stdin.read()

八、加密

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