思古解析js静态逆向分析
-
- 1.Fiddler抓包初步分析
- 2.请求接口参数分析
1.Fiddler抓包初步分析
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一个方框就是我们请求的地址，然后发起了第二个方框的请求，这里的参数是没有变化的，就是换了一个接口，然后第二个方框里面发起了一个https://jx.sigujx.com/sigu_jx.php 的post的请求，也就是第三个方框，这个post了5个加密的参数，这就是我们后面需要分析的内容。
然后这个接口返回了一个加密的url，解密后应该就是第四个方框的请求，这里返回的还只是一个网址，并不是m3u8，然后这里面又发起了一个请求，就是第五个方框，这个就是m3u8了，还是一个加密的m3u8，那么下面就是一步一步分析请求参数的逻辑
2.请求接口参数分析
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第二个方框返回的源代码中，可以看到有post请求的逻辑，这里的参数都给出来了
{"url":url,"key":sigu("070ea6cb655dd2ee4e07a68bfef84c9a"),"key2":sigu2("2110362178631681"),"key3":sigu3(key3),"token":token,"type":""},
| 参数 | 来源 |
|---|---|
| url | 全局中url变量的值 |
| key | 由已知参数经过sigu函数得到 |
| key2 | 由已知参数经过sigu2函数得到 |
| key3 | 由key3参数经过sigu3函数得到 |
| token | 全局中token变量的值 |
| type | 空值 |
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解密由https://www.qtool.net/decode网站提供的aaencode解密
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这里就可以得到token了，在混淆的最后发现了
var url = $('#sigu_url').val();
这里可以看到是区网页仲id为sigu_url的值作为url的值，网页中可以很简单的找到
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接下来还剩下三个方法体和一个参数，继续看看源代码的前面还引用了很多外部的js文件，全部都看一看，这里我直接说重要的地方，一个"/js/jquery.mim.js?20200731"下的js文件，里面的代码被混淆了
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解密由网站http://tool.yuanrenxue.com/decode_obfuscator提供的ob混淆专解测试版V0.1
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if (window["location"]["host"]["indexOf"](".sigujx.com") != -1 || window["location"]["href"]["indexOf"](".126c.cn") != -1) {
var key = CryptoJS["enc"]["Hex"]["parse"]("e10adc3949ba59abbe56e057f20f883e");
var iv = CryptoJS["enc"]["Hex"]["parse"]("1234567890abcdef1234567890abcdef");
var opinion = {
"iv": iv,
"padding": CryptoJS["pad"]["ZeroPadding"]
};
var sigu = function (_0x2605d6) {
var _0x435902 = CryptoJS["AES"]["encrypt"](_0x2605d6, key, opinion);
return _0x435902["toString"]();
};
} else {
var tz = "https://www.baidu.com/";
top["location"]["href"] = tz;
}var key3 = document["getElementById"]("sigu_url")["value"] + "|" + window["location"]["host"];
function sigu2(_0x2e1c4a) {
if (window["location"]["href"]["indexOf"](".sigujx.com") == -1 && window["location"]["href"]["indexOf"](".126c.cn") == -1) {
_0x2e1c4a = "dwvzv142x454fe54sa";
}_0x2e1c4a = window["btoa"](_0x2e1c4a);
len = _0x2e1c4a["length"];
arr = [];
for (var _0x516f63 = 0;
_0x516f63 < len;
_0x516f63++) {
arr["push"]((251 - _0x2e1c4a["charCodeAt"](_0x516f63))["toString"](32));
}return arr["join"]("");
}function sigu3(_0x188f66) {
if (window["location"]["href"]["indexOf"](".sigujx.com") == -1 && window["location"]["href"]["indexOf"](".126c.cn") == -1) {
_0x188f66 = "sa3f13a1c4a561zxsa";
}_0x188f66 = window["btoa"](_0x188f66);
len = _0x188f66["length"];
arr = [];
for (var _0x1a8c41 = 0;
_0x1a8c41 < len;
_0x1a8c41++) {
arr["push"]((218 - _0x188f66["charCodeAt"](_0x1a8c41))["toString"](32));
}return arr["join"]("");
}window["setInterval"](function () {
_0x474add();
}, 2000);
function sigu_decode(_0x2e228a) {
if (window["location"]["href"]["indexOf"](".sigujx.com") == -1 && window["location"]["href"]["indexOf"](".126c.cn") == -1) {
_0x2e228a = "asdsad541sdsa1";
}var _0x250992 = _0x2e228a["split"]("");
var _0x2bf917 = "";
var _0x591dc4 = [];
for (i = 0;
i < _0x250992["length"];
i++) {
if (i % 2 == 1 || i == 1) {
var _0x41b23e = _0x2bf917 + _0x250992[i];
_0x591dc4["push"](String["fromCharCode"](258 - parseInt(_0x41b23e, 32)));
}_0x2bf917 = _0x250992[i];
}return window["atob"](_0x591dc4["join"](""));
}function _0x474add(_0x27d42c) {
function _0x2acc6a(_0x2f36fb) {
if (typeof _0x2f36fb === "string") {
var _0x51f688 = function () {
(function (_0x379b99) {
return function (_0x379b99) {
return Function("Function(arguments[0]+\"" + _0x379b99 + "\")()");
}(_0x379b99);
})("bugger")("de");
};
return _0x51f688();
} else {
if (("" + _0x2f36fb / _0x2f36fb)["length"] !== 1 || _0x2f36fb % 20 === 0) {
(function (_0x38beb4) {
return function (_0x38beb4) {
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这里可以看到我们需要的函数都有了，我们一个一个函数分析，首先是key的sigu函数
var key = CryptoJS["enc"]["Hex"]["parse"]("e10adc3949ba59abbe56e057f20f883e");
var iv = CryptoJS["enc"]["Hex"]["parse"]("1234567890abcdef1234567890abcdef");
var opinion = {
"iv": iv,
"padding": CryptoJS["pad"]["ZeroPadding"]
};
var sigu = function (_0x2605d6) {
var _0x435902 = CryptoJS["AES"]["encrypt"](_0x2605d6, key, opinion);
return _0x435902["toString"]();
};
sigu函数使用的是AES/CBC/ZeroPadding的加密，而其中的key和iv都是以16进制的形式给出来了，所以直接写aes加密即可
然后是key2的sigu2函数
function sigu2(_0x2e1c4a) {
if (window["location"]["href"]["indexOf"](".sigujx.com") == -1 && window["location"]["href"]["indexOf"](".126c.cn") == -1) {
_0x2e1c4a = "dwvzv142x454fe54sa";
}_0x2e1c4a = window["btoa"](_0x2e1c4a);
len = _0x2e1c4a["length"];
arr = [];
for (var _0x516f63 = 0;
_0x516f63 < len;
_0x516f63++) {
arr["push"]((251 - _0x2e1c4a["charCodeAt"](_0x516f63))["toString"](32));
}return arr["join"]("");
}
这里是将参数base64编码后，转换为32进制。
但是python没有内置32进制的函数，所以这里自己写一个自定义函数将10进制数转换为32进制，这里使用到高中的一个方法，连续取余，逆向取值。
def to32(a):
b = []
table = {
'0': '0',
'1': '1',
'2': '2',
'3': '3',
'4': '4',
'5': '5',
'6': '6',
'7': '7',
'8': '8',
'9': '9',
'10': 'a',
'11': 'b',
'12': 'c',
'13': 'd',
'14': 'e',
'15': 'f',
'16': 'g',
'17': 'h',
'18': 'i',
'19': 'j',
'20': 'k',
'21': 'l',
'22': 'm',
'23': 'n',
'24': 'o',
'25': 'p',
'26': 'q',
'27': 'r',
'28': 's',
'29': 't',
'30': 'u',
'31': 'v'
}
while a != 0:
b.append(table[str(a % 32)])
a = a // 32
return ''.join(b[::-1])
最后是key3参数和sigu3函数
var key3 = document["getElementById"]("sigu_url")["value"] + "|" + window["location"]["host"];
这里取id为sigu_url的值就是前面说到的全局的url的值，也是第一个参数的值，后面就是定值host了
function sigu3(_0x188f66) {
if (window["location"]["href"]["indexOf"](".sigujx.com") == -1 && window["location"]["href"]["indexOf"](".126c.cn") == -1) {
_0x188f66 = "sa3f13a1c4a561zxsa";
}_0x188f66 = window["btoa"](_0x188f66);
len = _0x188f66["length"];
arr = [];
for (var _0x1a8c41 = 0;
_0x1a8c41 < len;
_0x1a8c41++) {
arr["push"]((218 - _0x188f66["charCodeAt"](_0x1a8c41))["toString"](32));
}return arr["join"]("");
}
sigu3函数和前面sigu2基本一样，也是base64以后转换为32进制
到这里https://jx.sigujx.com/sigu_jx.php 接口的5个参数都拿到了，这时请求返回会获得一个加密的url，继续看源代码里面请求成功时的回调函数
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这里可以看到请求成功是调用了sigu_play函数，继续在源代码查找这个函数
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这里可以看到sigu_play函数对url执行了sigu_decode函数，这个函数也在前面三个加密函数一起出现的
function sigu_decode(_0x2e228a) {
if (window["location"]["href"]["indexOf"](".sigujx.com") == -1 && window["location"]["href"]["indexOf"](".126c.cn") == -1) {
_0x2e228a = "asdsad541sdsa1";
}var _0x250992 = _0x2e228a["split"]("");
var _0x2bf917 = "";
var _0x591dc4 = [];
for (i = 0;
i < _0x250992["length"];
i++) {
if (i % 2 == 1 || i == 1) {
var _0x41b23e = _0x2bf917 + _0x250992[i];
_0x591dc4["push"](String["fromCharCode"](258 - parseInt(_0x41b23e, 32)));
}_0x2bf917 = _0x250992[i];
}return window["atob"](_0x591dc4["join"](""));
}
这里实际就是将32进制的转换为10进制，这里最后结果得到的就是前面方框4的链接，继续请求这里链接
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这里可以看到通过参数isiPad来控制加载的方式，如果是假，那么就直接载入这个地址（说明是非加密的），如果是真，则调用一个DPlayer的播放器来播放（说明是加密的），再看看源代码里面
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这里可以看到burl是由url和token组成，其中的url前面已经给出来了，还却一个token。这里有一段混淆的代码，先对它进行反混淆
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var system = {};
var s = "off";
var isiPad = false;
var p = navigator["platform"];
var u = navigator["userAgent"];
system["win"] = p["indexOf"]("Win") == 0;
system["mac"] = p["indexOf"]("Mac") == 0;
system["x11"] = p == "X11" || p["indexOf"]("Linux") == 0;
if (system["win"] || system["mac"] || system["xll"]) {
if (u["indexOf"]("Windows Phone") > -1) {} else {
s = "on";
isiPad = true;
}
}var token = etoken(url + "|" + s);
function etoken(_0x295653) {
var _0x13ebfa = function () {
var _0x3b77c9 = true;
return function (_0x2922e8, _0x514134) {
var _0xc11c4b = _0x3b77c9 ? function () {
if (_0x514134) {
var _0x40039c = _0x514134["apply"](_0x2922e8, arguments);
_0x514134 = null;
return _0x40039c;
}
} : function () {};
_0x3b77c9 = false;
return _0xc11c4b;
};
}();
var _0x3a009c = _0x13ebfa(this, function () {
var _0x1a7903 = typeof window !== "undefined" ? window : typeof process === "object" && typeof require === "function" && typeof global === "object" ? global : this;
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cdQHrnF.avFTZideqo.zNweq111Wxr.StCfAfCoNpXKFSbbauOHhfSmAsZIbWkPuklyaPjzrAlLGqyshqEUYHUhuDCGZKD"["replace"](new RegExp("[IKOAbCDkxsxCXPJUBzqGQHrFaFTZqzNqWxrSCfAfCNXKFSbbauOHhfSmAsZIbWkPuklyaPjzrAlLGqyshqEUYHUhuDCGZKD]", "g"), "")["split"](";
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_0x3363bc[_0x6fcf25][_0x2fdf96] = _0x3efb84;
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}]];
var _0x3f1058 = function () {
while (_0x3363bc[2][2]()) {
_0x1a7903[_0x3363bc[0][0]][_0x3363bc[0][2]][_0x3363bc[0][4]] = _0x1a7903[_0x3363bc[0][0]][_0x3363bc[0][2]][_0x3363bc[0][4]];
}
};
for (var _0x34d7bf in _0x1a7903) {
if (_0x34d7bf["length"] == 8 && _0x3363bc[2][0](_0x34d7bf, 7, 116) && _0x3363bc[2][0](_0x34d7bf, 5, 101) && _0x3363bc[2][0](_0x34d7bf, 3, 117) && _0x3363bc[2][0](_0x34d7bf, 0, 100)) {
_0x3363bc[2][1](0, 0, _0x34d7bf);
break;
}
}for (var _0x25b628 in _0x1a7903[_0x3363bc[0][0]]) {
if (_0x25b628["length"] == 6 && _0x3363bc[2][0](_0x25b628, 5, 110) && _0x3363bc[2][0](_0x25b628, 0, 100)) {
_0x3363bc[2][1](0, 1, _0x25b628);
break;
}
}for (var _0x26cbb9 in _0x1a7903[_0x3363bc[0][0]]) {
if (_0x26cbb9["length"] == 8 && _0x3363bc[2][0](_0x26cbb9, 7, 110) && _0x3363bc[2][0](_0x26cbb9, 0, 108)) {
_0x3363bc[2][1](0, 2, _0x26cbb9);
break;
}
}for (var _0x248797 in _0x1a7903[_0x3363bc[0][0]][_0x3363bc[0][2]]) {
if (_0x248797["length"] == 4 && _0x3363bc[2][0](_0x248797, 3, 102)) {
_0x3363bc[2][1](0, 4, _0x248797);
} else {
if (_0x248797["length"] == 8 && _0x3363bc[2][0](_0x248797, 7, 101) && _0x3363bc[2][0](_0x248797, 0, 104)) {
_0x3363bc[2][1](0, 3, _0x248797);
}
}
}if (!_0x3363bc[0][0] || !_0x1a7903[_0x3363bc[0][0]]) {
return;
}var _0xc58546 = _0x1a7903[_0x3363bc[0][0]][_0x3363bc[0][1]];
var _0x1c2289 = !!_0x1a7903[_0x3363bc[0][0]][_0x3363bc[0][2]] && _0x1a7903[_0x3363bc[0][0]][_0x3363bc[0][2]][_0x3363bc[0][3]];
var _0x5c0d90 = _0xc58546 || _0x1c2289;
if (!_0x5c0d90) {
return;
}_0x45cbfc: for (var _0x380460 = 0;
_0x380460 < _0x3363bc[1][0]["length"];
_0x380460++) {
var _0x3c1d63 = _0x3363bc[1][0][_0x380460];
var _0x5feee2 = _0x5c0d90["length"] - _0x3c1d63["length"];
var _0x159175 = _0x5c0d90["indexOf"](_0x3c1d63, _0x5feee2);
var _0x17b728 = _0x159175 !== -1 && _0x159175 === _0x5feee2;
if (_0x17b728) {
if (_0x5c0d90["length"] == _0x3c1d63["length"] || _0x3c1d63["indexOf"](".") === 0) {
_0x3363bc[1][0] = "_0xb033a4";
break _0x45cbfc;
}
}
}if (_0x3363bc[1][0] !== "_0xb033a4") {
_0x3f1058();
}
});
_0x3a009c();
if (window["location"]["href"]["indexOf"](".nn69.top") == -1 && window["location"]["href"]["indexOf"](".we111.top") == -1) {
_0x295653 = "sa3f13assf551c4a561zxsa";
}_0x295653 = window["btoa"](_0x295653);
len = _0x295653["length"];
arr = [];
for (var _0x1af1f6 = 0;
_0x1af1f6 < len;
_0x1af1f6++) {
arr["push"]((222 - _0x295653["charCodeAt"](_0x1af1f6))["toString"](32));
}return arr["join"]("");
}
这里可以看到token是由url和s组成，这里的s取on或者off，代表加密和不加密，同时控制了isiPad的值，使得返回的数据针对是否加密分别处理，这里我们以加密的继续分析，即s为on。然后进行了一个etoken的方法
function etoken(_0x295653) {if (window["location"]["href"]["indexOf"](".nn69.top") == -1 && window["location"]["href"]["indexOf"](".we111.top") == -1) {
_0x295653 = "sa3f13assf551c4a561zxsa";
}_0x295653 = window["btoa"](_0x295653);
len = _0x295653["length"];
arr = [];
for (var _0x1af1f6 = 0;
_0x1af1f6 < len;
_0x1af1f6++) {
arr["push"]((222 - _0x295653["charCodeAt"](_0x1af1f6))["toString"](32));
}return arr["join"]("");
}
现在可以说是熟悉的算法了，又是base64后转换为32进制，此时继续请求，可以得到一段加密的内容，仔细观看可以发现类似base64编码，但是又存在不属于base64编码的字符，其中是以=结尾的，那么就说明可能是某些字符被替换了
这里我们之前遇到一个类似的，就可以利用起来https://www.52pojie.cn/thread-1258605-1-1.html。实际使用的是相同的加密，那么我就不再次分析了，直接从引用的"/static/js/hls.min.js?20200302"取出替换的代码
s.sgdehlsdata = https://www.it610.com/article/function (data) {
var data = data.replace(///g,"B");
data = https://www.it610.com/article/data.replace(/_/g,"A");
data = https://www.it610.com/article/data.replace(/~/g,"V");
data = https://www.it610.com/article/data.replace(/-/g,"h");
data = https://www.it610.com/article/data.replace(/*/g,"I");
data = https://www.it610.com/article/data.replace(/!/g,"N");
data = https://www.it610.com/article/data.replace(/@/g,"O");
data = https://www.it610.com/article/data.replace(/(/g,"s");
data = https://www.it610.com/article/data.replace(/)/g,"X");
data = https://www.it610.com/article/this.base64_decode(data);
data = data.replace(/###/g,"?");
return data
}
【python|思古解析js静态逆向分析】最后就可以得到解密的m3u8文件了，下面是完整的python代码
import requests
import re
import base64
from Crypto.Cipher import AESdef main():
shareurl = 'https://v.qq.com/x/cover/mzc00200x0no5q6/j0034pg5y37.html'
apiurl = 'https://jx.sigujx.com/?url='+shareurl
headers = {
'Referer': 'https://api.sigujx.com/'
}
response = requests.get(apiurl, headers=headers).text
tokentext = re.findall("(?<=/\*请勿盗用\*/).+?\('_'\);
", response)[0]
apiurl = 'https://www.qtool.net/api/aaencode.jsp'
data = https://www.it610.com/article/{'code': tokentext
}
token = requests.post(apiurl, data=https://www.it610.com/article/data).text.replace('\\', '')[8:-3]
url = re.findall('(?<=id="sigu_url" value="https://www.it610.com/article/).+?(?=")', response)[0]
key = re.findall('(?<=sigu\(").+?(?=")', response)[0]
crypto = AES.new(key=bytes.fromhex('e10adc3949ba59abbe56e057f20f883e'), mode=AES.MODE_CBC, iv=bytes.fromhex('1234567890abcdef1234567890abcdef'))
key = base64.b64encode(crypto.encrypt(key.encode())).decode()
key2 = re.findall('(?<=sigu2\(").+?(?=")', response)[0]
key2 = base64.b64encode(key2.encode()).decode()
key2 = ''.join(list(map(lambda n: to32(251 - ord(n)), key2)))
key3 = url+'|jx.sigujx.com'
key3 = base64.b64encode(key3.encode()).decode()
key3 = ''.join(list(map(lambda n: to32(218 - ord(n)), key3)))
apiurl = 'https://jx.sigujx.com/sigu_jx.php'
data = https://www.it610.com/article/{'url': url,
'key': key,
'key2': key2,
'key3': key3,
'token': token,
'type': ''
}
response = requests.post(apiurl, headers=headers, data=https://www.it610.com/article/data).json()
url = re.findall('.{2}', response['url'])
url = 'https:'+base64.b64decode(bytes(list(map(lambda n: 258 - int(n, 32), url)))).decode()
response = requests.get(url, headers=headers).text
url = re.findall("(?<=var url = ').+?(?=')", response)[0]
token = base64.b64encode((url+'|on').encode()).decode()
token = ''.join(list(map(lambda n: to32(222 - ord(n)), token)))
m3u8url = 'https://cdn.video.nn69.top'+url+'?token='+token
response = requests.get(m3u8url, headers=headers).text
response = response.replace('*', 'I').replace('~', 'V').replace('!', 'N').replace('/', 'B').replace('@', 'O').replace('_', 'A').replace(')', 'X').replace('-', 'h').replace('(', 's')
m3u8text = base64.b64decode(response.encode()).decode().replace('###', '?')
print(m3u8text)def to32(a):
b = []
table = {
'0': '0',
'1': '1',
'2': '2',
'3': '3',
'4': '4',
'5': '5',
'6': '6',
'7': '7',
'8': '8',
'9': '9',
'10': 'a',
'11': 'b',
'12': 'c',
'13': 'd',
'14': 'e',
'15': 'f',
'16': 'g',
'17': 'h',
'18': 'i',
'19': 'j',
'20': 'k',
'21': 'l',
'22': 'm',
'23': 'n',
'24': 'o',
'25': 'p',
'26': 'q',
'27': 'r',
'28': 's',
'29': 't',
'30': 'u',
'31': 'v'
}
while a != 0:
b.append(table[str(a % 32)])
a = a // 32
return ''.join(b[::-1])if __name__ == '__main__':
main()
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