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安卓逆向分析之酷狗signature案例分享

作者：别None了　　发布时间：2022-12-06 21:23:37　

标签：安卓逆向,酷狗,signature

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前言

一篇酷狗app安卓逆向的文章，难度适中。

样本: 酷狗app v10.8.8

工具: jadx、Pixel3 安卓10、frida、charles

小伙伴可以跟着一起做做

提示：以下是本篇文章正文内容，下面案例可供参考

一、抓包待分析参数

1.1 charles抓包-音乐评论接口

可以看到signature参数，用apipost模拟请求下试试

1.2 模拟请求

1.3 查壳

二、分析

2.1 packageName

package=“com.kugou.android” 接下来hook需要用到

2.2 搜索关键词

hashMap.put(“signature”,com.kugou.android.ads.feev4.a.a(sb.toString())); 相当可疑了我们点进去看下

代码如下

public static Map<String, Object> a(Context context, JSONObject jSONObject) {
HashMap hashMap = new HashMap();
hashMap.put("dfid", com.kugou.common.q.b.a().dq());
hashMap.put("appid", com.kugou.android.b.c.d());
hashMap.put("mid", br.j(context));
hashMap.put("uuid", com.kugou.common.q.b.a().ak());
hashMap.put("clientver", Integer.valueOf(d.a(context)));
hashMap.put("clienttime", Long.valueOf(System.currentTimeMillis() / 1000));
String a2 = com.kugou.android.ads.feev4.a.a(hashMap);
StringBuilder sb = new StringBuilder();
sb.append(a2);
sb.append(jSONObject == null ? "" : jSONObject.toString());
hashMap.put("signature", com.kugou.android.ads.feev4.a.a(sb.toString()));
return hashMap;
}

可以看到定义hashMap put(“dfid”) put(“appid”)等等

String a2 = com.kugou.android.ads.feev4.a.a(hashMap);
StringBuilder.append(a2),

hook下a2的值

2.3 a2追踪hook

com.kugou.android.ads.feev4.a.a(hashMap);

jadx代码如下：

public static String a(Map<String, Object> map) {
if (map == null || map.isEmpty()) {
return "";
}
ArrayList<String> arrayList = new ArrayList(map.keySet());
Collections.sort(arrayList);
StringBuilder sb = new StringBuilder();
for (String str : arrayList) {
if (!TextUtils.isEmpty(str)) {
sb.append(str);
sb.append(ContainerUtils.KEY_VALUE_DELIMITER);
sb.append(map.get(str));
}
}
return sb.toString();
}

参数 --> [object Object]
参数 --> appid=1005clienttime=秒级时间戳clientver=10889dfid=xxmid=xxuuid=xx

hook代码如下：

import frida, sys
def on_message(message, data):
if message['type'] == 'send':
print("[*] {0}".format(message['payload']))
else:
print(message)

jscode_hook = """
Java.perform(
function(){
var a2_class = Java.use("com.kugou.android.ads.feev4.a")
a2_class.a.overload('java.util.Map').implementation = function (m) {
console.log("参数 --> "+m)
var result = this.a(m)
console.log("参数 --> "+result1)
return result
}
})
"""
process = frida.get_usb_device().attach('com.kugou.android')
script = process.create_script(jscode_hook)
script.on('message', on_message)
print('[*] Hook Start Running')
script.load()
sys.stdin.read()

a2 = "appid=1005clienttime=秒级时间戳clientver=10889dfid=xxmid=xxuuid=xx"

接着往下分析

hashMap.put(“signature”, com.kugou.android.ads.feev4.a.a(sb.toString()));

点进去看下a()

2.4 b2追踪hook

String b2 = h.a().b(a.AbstractC1142a.N);

返回了b2的值 hook看看

b2 = “OIlwieks28dk2k092lksi2UIkp”
return ba.c(b2 + str + b2);

2.5 hook 加密函数

hook代码如下:

import frida, sys
def on_message(message, data):
if message['type'] == 'send':
print("[*] {0}".format(message['payload']))
else:
print(message)
jscode_hook = """
Java.perform(
function(){
var sign_class = Java.use("com.kugou.common.utils.ba");
console.log(sign_class);
if (sign_class != undefined) {
sign_class.b.overload('java.lang.String').implementation = function (str) {
console.log("参数: ==> : " + str);
var res = sign_class.b(str);
console.log("解密结果: ==> " + res);
return res;
}
}
}
)
"""
process = frida.get_usb_device().attach('com.kugou.android')
script = process.create_script(jscode_hook)
script.on('message', on_message)
print('[*] Hook Start Running')
script.load()
sys.stdin.read()

hook结果:

params: OIlwieks28dk2k092lksi2UIkpappid=1005clienttime=1643368936clientver=10889dfid=1bHOPF2BFRqk3UpxUx1hzf53mid=232539908206342312896345662088253784255uuid=ed42ee74c48dd921427f2729a68787a7{“plat”:0,“channel”:“287”,“operator”:7,“networktype”:2,“userid”:0,“vip_type”:65530,“m_type”:0,“tags”:"{}",“device”:{“phonebrand”:“google”,“sysmodel”:“Pixel％203”,“osversion”:“10”,“boot_time”:“ae3d80cd-0450-415a-ab64-814b54c1dd6e”,“os_update_time”:“441644.63333339”,“width”:1080,“height”:2028},“song”:{“hash”:“ce388811b08b3327c388e2b0ed1f2d30”,“albumid”:0,“album_audio_id”:339101224},“mode”:“normal”}OIlwieks28dk2k092lksi2UIkp
结果: ca66b35e1581e9494f52cbec986816eb 32位试下是不是md5