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[原创]某车联网APPx梆加固 浅浅分析
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发表于: 2022-8-10 18:05
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目标App：比亚迪汽车 6.1.0
工具：Cydia、Frida、Objection、Storm Sniffer(抓包)
首先打开Storm Sniffer，该AppStore可下载。（使用fiddler也可以）
目标App开启了SSLPinning，导致无法抓包。
通过objection绕过SSLPinning
接下来可以看到抓包内容了
软件提示：账号密码错误
使用 frida-ios-dump进行砸壳dump出ipa文件，找到包内二进制文件，拖入IDA中分析。
4.1 思路： Frida hook -[NSURLRequest initWithURL:] 打印其调用堆栈
输出如下：
根据AFHTTPRequestSerializer可以判断出该App使用了 AFNetwoking库
继续hook -[AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:] 获取parameters参数，内容为加密后参数。
可以判断出加密点在+ [BYDHttpsRequestUtils httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:] 方法内。
4.2 ida 查看+ [BYDHttpsRequestUtils httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:]
这里使用Hopper反编译出现了一些问题（菜鸡 这里不知道Hopper如何更改 函数范围，有大佬知道可以留言一些么）
看一眼CFG图。（一种植物）！控制流混淆，稳住，问题不大，先看伪代码试试。
这里创建了网络请求 requestInfo实例，找一下设置参数 的函数调用。
这里找到了，+[BYDDataManager entryRequestInfo:]这个方法返回加密内容，传入的v6是明文消息字典的aes加密，密钥为$key+$value拼接sha1（先挖个坑，这里讲起来太复杂），再跟进一下康康。
wd**d，离谱了。再继续看看伪代码：
看到request字符串了，上面有个BangSafeSDK可以确定是梆梆企业的加密了，再继续深入看看+[BangSafeSDK checkcode:dataStyle:]，结果utf8 编码、获取当前时间，最终调用了sub_1023BE0D4。
这里本来想看看sub_1023BE0D4的CFG,IDA直接给报错了，节点太多。
怎么办呢？ 盲猜一手控制流混淆（已经习惯了），上trace！干他！
Frida Stalker trace一下调用地址，感谢misskings大佬。
trace 的指令如下：
配合ida python脚本，去除无用分支：
再次查看CFG图：
不会，遂放弃。
毁灭吧！！！ 挖坑了，其实还是控制流混淆，先分析到这里吧。
objection -g 比亚迪汽车 explore
ios sslpinning disable --quiet
objection -g 比亚迪汽车 explore
ios sslpinning disable --quiet
https://dilinkappserver.byd.com/app/auth/login
User-Agent: bi ya di qi che/6.0.1 (iPhone; iOS 14.0; Scale/3.00)
Content-Type: application/json
Host: dilinkappserver.byd.com{"request":"FESWLgT0LjY\/GjPQmt4xYvDWajog909VYoUcLQ8TE7E\/F4U9GwHtbmfY9uZbmqPnGW2ys0NRnezIjTETA64wpvfP3aZV+caLdK8fsLovfxoacBp5hIkvlS4hTEYkl8XfIfashQDMOdYmm8W89ZBwpFF+Ipd9hFy7NGHDom4SgXQ5uE7Io8jFnoGiz5CiQ9B3K0NbCSOkSbbwJi14iFi15sy3car\/W3xMNUZuo7\/vNE7Dz\/eHwxroJ7L+DK\/6yXbNLRHMHRtXJykfnD31ShNTEqzkF+Fp2Z6jUuFFpn4B7SB4uJYWe5cJ9g3gDIOEifHEhhD3LCQfOEKppgisduO8el4rEGFaKPx1bzOAIk0W1qPXk0LbVCFPQYFpypUB8Rrn2hBBsA8cepRBBtH73jeRcvrRMBc0gK+YRw4uq8yd44bNoEpSt1L5YOJBelSxmp9WOhkGOjt5cPCHij1ptaO9gp1d7XAg4+MhpzXoluB8aPi8A28stX04l+HdU6lNU0pUGYtFVRbTvYV4KjseXQ5wlRavwFMgv3c61WUMznyLmtI8zdheCVdr3vGG1nNvGI7cqMHdw8jvdYFCe9jr3eu1nG2uHakh7PHDMyEDpEh7WSJvVod+0sleiS+vhv5xnNhXUOtBtjCUcLSZToY6YJky9O4E8WDOGg2j5kvCaHrY\/bgSGd87O7sCkmrjeYEJj5BSV95tlI2Ky1GlTRvG4jLQ800QuXAJyXQJpf9uO5lbmV2yPJ7OcKbRoaRu7rhMj4yok9dPEY5bIJeMFptv+bBTKgRh18R5ZecUdpyx8PrVY7FvTEihzH9z+ACGIMNgw7MZIVRPBqLh\/zXK1JfY3pPblvLVhmbeWQ6ETTC2eEWDmAcBovF+Mpj\/M2ybwRdFGLATHZJUQCobYS+02Jxfd0\/ODHpOQ7c2RJwZh6aijIEeh3Ohj1weh\/ZNAK7189yi3n810Bne0ld\/Vo11Jk7hSSQ9z1vCZijCzbDb4Yuw+jsnM\/CPS0OBMMQqIsuz9TPJ\/89SP103sVv01AOXWUM0OB97POJpQ8Bnfjusf8x7CKURlyj4hl6NHksSAGeOmPv96B\/X\/xEARr3Lq7K0RnVFjqFJUsXVVJavggfrhexl7xgvU7MqOPZ24ZiMmOTKTKP+WVsykcraeoP9+yuYkhdMLPEBelpnkoHOuHvpqojhOcJvN8pu\/tRclZO6KGuRD8I7M3J2+mMo8ZTNQUB7oYVR\/UfIKJ5+aIybJklZ1HTb5nV\/D1tDgWRN5JDvndJ78cEi6s8Hi9gsZjglN1JNaQ3vShP7RuLSYdRqDO7e27cSkibTH4YW6PsHPHhqX2g4ev8WTEbRIAsiVJTOuJqNaPaoX3oDMviBz5aZ0iu6XwRwbojibWBCOABktvzVNgngxxeyPmyJlVQ5H5ehn\/iNNZC4RRz0FqhetTfWdQWXnRqicq+tiujO478mQQVKTDKvhi6y0uL2g2SuR81QJ0YmhlCFxqFWX2ACpro\/4HM5J0EdJvboVwrR70CEBa6pqwsvCSCQCltwM+EDH+OYxt34oL1ngY7+fsm1oZcyEvn3\/snVZcd97klBzdl5oCyj3ANtoDIQua35u2ENXbPc8CqIIlcbPVsmF5U1ESRs5khYlDjBH6qvpZBoA4a36pgMZVu8XKpk7c+bOIB0WrZcMSaIF+r2x0Jg8ZKjrZ\/AwhoRDHAtEIQNDLNkPDvjoEcoI0CF3\/p\/AVyjko9aqtatyNZE7i0MQ4SUdamyogd428NFygGgq5JtoSe3XXL\/3hWxlbTGqESnPXKjh7jTG5FQxy6grBp7lVN2DSW2yNkvVOrtVaRjIbTzJd7\/oiUE29Yx1l\/1tPpJTq0CDSa2sTGgYHyPkppcoA3OXLiEGuQC0lKuvuahyAh956uueAi7DvMUWzPemfszzr6Bd35RucQE5tFjzQ19QIIDGhxLHMfweQHO2jEUuTddqRbnO3ZVyM8jZpcNBwMKbuqjk"}
{"response":"Fel63A3fJsBnqDNoqrf3sNRYntlgl2bMzWrA56aEQZRggnMBao9z1ds1G/TqV2TMwrRu1wovdv5AwWkDlpdqO0A=="}
https://dilinkappserver.byd.com/app/auth/login
User-Agent: bi ya di qi che/6.0.1 (iPhone; iOS 14.0; Scale/3.00)
Content-Type: application/json
Host: dilinkappserver.byd.com{"request":"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"}
{"response":"Fel63A3fJsBnqDNoqrf3sNRYntlgl2bMzWrA56aEQZRggnMBao9z1ds1G/TqV2TMwrRu1wovdv5AwWkDlpdqO0A=="}
try {
var className = "NSURLRequest";
var funcName = "- initWithURL:";
var hook = eval('ObjC.classes.' + className + '["' + funcName + '"]');
Interceptor.attach(hook.implementation, {
onEnter: function(args) {
console.log(colors.green,"NSURLRequest with URL: ",colors.resetColor + ObjC.Object(args[2]));
console.log("\nBacktrace:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE)
.map(DebugSymbol.fromAddress).join("\n"));
},
});
} catch (error) {
console.log(colors.red,"[!] Exception: ",colors.resetColor + error.message);
}
try {
var className = "NSURLRequest";
var funcName = "- initWithURL:";
var hook = eval('ObjC.classes.' + className + '["' + funcName + '"]');
Interceptor.attach(hook.implementation, {
onEnter: function(args) {
console.log(colors.green,"NSURLRequest with URL: ",colors.resetColor + ObjC.Object(args[2]));
console.log("\nBacktrace:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE)
.map(DebugSymbol.fromAddress).join("\n"));
},
});
} catch (error) {
console.log(colors.red,"[!] Exception: ",colors.resetColor + error.message);
}
[iPhone::比亚迪汽车 ]-> NSURLRequest with URL: https://dilinkappserver.byd.com/app/auth/login
Backtrace:0x1057d943c /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:]
0x1057d106c /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[AFHTTPSessionManager dataTaskWithHTTPMethod:URLString:parameters:headers:uploadProgress:downloadProgress:success:failure:]
0x1057d0780 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[AFHTTPSessionManager POST:parameters:headers:progress:success:failure:]
0x1049e1e24 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!+[AFNRequestUtls postRequestWithInfo:successBlock:failedBlock:]
0x104b4d270 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!+[BYDHttpsRequestUtils httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:]
0x1048f48fc /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[BYDUserModel doLoginSuccess:failed:]
0x104a4c4f8 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[BYDLoginVC doLogin]
...[iPhone::比亚迪汽车 ]-> NSURLRequest with URL: https://dilinkappserver.byd.com/app/auth/login
Backtrace:0x1057d943c /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:]
0x1057d106c /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[AFHTTPSessionManager dataTaskWithHTTPMethod:URLString:parameters:headers:uploadProgress:downloadProgress:success:failure:]
0x1057d0780 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[AFHTTPSessionManager POST:parameters:headers:progress:success:failure:]
0x1049e1e24 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!+[AFNRequestUtls postRequestWithInfo:successBlock:failedBlock:]
0x104b4d270 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!+[BYDHttpsRequestUtils httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:]
0x1048f48fc /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[BYDUserModel doLoginSuccess:failed:]
0x104a4c4f8 /private/var/containers/Bundle/Application/48133A5D-90E1-494C-8472-79C2B5DE912B/比亚迪汽车.app/比亚迪汽车!-[BYDLoginVC doLogin]
.../// <reference path="frida-gum.d.ts" />
//+[BYDHttpsRequestUtils httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:]
var target = ObjC.classes['BYDHttpsRequestUtils']['+ httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:']
console.log(target.implementation)var m = Process.getModuleByAddress(target.implementation)
var vm = m.base.add(0x23BE0D4)//注意ida加载二进制文件的基地址
var baseAddr = m.base
console.log(vm);Interceptor.attach(vm, { onEnter: function (args) {
console.log("enter")
this.tid = Process.getCurrentThreadId()
console.log(this.tid);
Stalker.follow(this.tid, {
events: {
// 暂时不需要这些 events
call: false,
ret: false,
exec: false,
block: false,
compile: false
},
transform: function (iterator) {
var instruction = iterator.next();
const startAddress = instruction.address;
// 从ida里面 找到 sub_1023BE0D4 函数的地址范围，alt+p
var is = startAddress.compare(baseAddr.add(0x23CBB6C))<0 && startAddress.compare(baseAddr.add(0x23BE0D4))>=0;
do{
if(is){
console.log(instruction.address.sub(baseAddr).add(0x100000000) + ":" + instruction);
}
iterator.keep();
} while ((instruction = iterator.next()) !== null);
}
})
},
onLeave: function (ret) {
Stalker.unfollow(this.tid)
}
})/// <reference path="frida-gum.d.ts" />
//+[BYDHttpsRequestUtils httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:]
var target = ObjC.classes['BYDHttpsRequestUtils']['+ httpsPostRequestWithRequestRequestInfo:successBlock:failedBlock:']
console.log(target.implementation)var m = Process.getModuleByAddress(target.implementation)
var vm = m.base.add(0x23BE0D4)//注意ida加载二进制文件的基地址
var baseAddr = m.base
console.log(vm);Interceptor.attach(vm, { onEnter: function (args) {
console.log("enter")
this.tid = Process.getCurrentThreadId()
console.log(this.tid);
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最后于 2022-8-24 14:25
被FANGG3编辑
，原因：
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谢谢～～ |
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意思是用手机逆向么？ |
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