JS reverse tutorial second issue - Ape anthropology first question

js The second issue of reverse tutorial - The first question of ape man

( Multi map early warning ）

Topic analysis ：

First , Get into Website , View page tips ：

After turning the page, I found 4、5 Page cannot be entered ：

Right click to check for packet capture analysis , Discover that there is infinity debugger The breakpoint ：

Right click on the line number , Choose not to pause here ：

Then click continue , You can run the page normally , Skip this breakpoint , You can grab bags ：

Click on XHR You can view all request packages ：

Among them, there are parameters m Is the data package we need ：

（ Be careful ： In fact, there is another in the request parameter page Parameters , Just here is the first page , therefore page Parameters can be omitted , After that, the page request can be seen through packet capturing page Parameters ）

So at this time , Our goal is very clear , Is to get the data package of the page , The most important thing is how to get m Parameters ：

We double-click this file directly , Open it in a browser , See if you can get the data ：

Find out , Data cannot be obtained directly through this connection , Returns the token failed, This is usually a parameter error , In this project , That is to say m Parameter value error , This is what we can guess , This parameter m It should not be a fixed value , But a value that changes at any time .

js Reverse analysis

The above process is the analysis process of regular pages , Next, if we want to get the parameters m, It's about... Of the page js Code analysis , That is to say js reverse , We first analyze the data package file we just got , Check the data acquisition process , Directly click the launcher , You can see the options of the request call stack ：

（ Knowledge about request stack , You can baidu yourself , There are so many tutorials ）

We can find out , The first two stacks are jQuery The first name , We can roughly estimate that these two are jQuery Memory stack needed by the framework , therefore , We can go directly to the third stack request：

Perform debugging and execution , You can set more breakpoints ：

You can check some experiences js Confused code , Let's find some ideas , Output directly on the console ：

At this time , The idea is more obvious , You can guess that this part of the code , Yes m and page The value of is modified , Even if there is no modification , At least it also used , You can also follow the trend .

We put this code into the editor for analysis ：

Will some js Replace confused code ：

（ The console of developer tools is still very easy to use ）

here , The logic of the code is much clearer .

（ Here's a reminder , When these confused characters are converted , We must focus on the transformation of browsers , Directly copy the characters parsed by the browser , Don't type your own characters , It's easy to make mistakes , For example, the character of the vertical bar below , If you fight by yourself , It's bound to go wrong , I don't know why -_-）

here , We also need oo000 Function code , To run these codes , At this time , We will locate the code location of this function in the browser ：

such , It can be well positioned , Click on the position displayed , You can jump to the corresponding function position ：

here , It is found that this is a piece of code that cannot be formatted , We can detain him , Format in the editor ：

Search function names directly , You can locate the code location .

Through the code analysis, we can see ,oo000 The last return value of the function is null , So actually _0x57feae The return value of this parameter is only window[‘\x66’] namely window[“f”], therefore , We need to find window[“f”] Changed places , We can find out oo000 There is... In the function eval function , The processing parameters are window[“b”], We will window[“b”] Code deduction ：

Pass it atob Function decoding ：

Deduct the code for analysis , Because it's through eval Function to execute , So you can directly change the string to code ：

Then execute the code directly ：

It is found that the error is window No definition , Then we will window Set to global variable ：

Run again , Found an error ,mwqqppz is not defined：

At this time , Let's look at the code , It's true that mwqqppz No definition , And I didn't find mwqqppz What do you do specifically , At this time , We need to go back and see eval Function execution , Other code execution is found later , And I brought it oo000 The parameters of the function mw, So let's decode the code first , figure out J Function execution result , At this time , We can execute directly in the browser .

Select the code block on the left side of the source code interface , Click on “+ New code block ”：

take J Functions and U The execution code of the function is stuck in ：

Click execute below the code block （ctrl+Enter） after , You can execute related functions , Enter the code you want to execute on the console ：

You can see the corresponding results ：

Replace the corresponding code with the execution result ：

At this time , You can see this paragraph more clearly eval The code execution process , Basically, it will window[‘b’] In the code block of mwqqppz Replace parameter with oo000 Parameters brought in by function mw, And this mw And what is it ？

We see the oo000 Calling procedure of function ：

We put this parameter into the browser for execution view ：

You can find , This parameter is the current timestamp , This also confirms our conjecture that the parameters brought in may be real-time changing values .

therefore , function oo000 It's basically useless , Only need to md5 Encryption function （ namely window[‘b’] Code for ） Medium mwqqppz Change to the current timestamp ：

（ Be careful ： To change the code order , because _0x2268f9 It is defined later ）

At this time , Execute code directly , You can print out _0x5d83a3[‘m’] Value , And what we need m：

thus ,js The retrograde analysis of the code is the end （ End of the flower *.*)

Data processing analysis

Don't talk much , Go straight to the code ：

import json
import execjs
import requests

base_url = 'https://match.yuanrenxue.com/api/match/1'

headers = {
    
    "referer": "https://match.yuanrenxue.com/match/1",
    "user-agent": "yuanrenxue.project"
}

cookies = {
    
    "sessionid": ""
}
#  Read js file 

with open('match_01.js', 'r', encoding='utf-8') as f:
    js_code = f.read()
func = execjs.compile(js_code)

all_sum = 0
num = 0
for page in range(1, 6):
    m = func.call("get_m")
    params = {
    
        "page": str(page),
        "m": m
    }
    response = requests.get(url=base_url, headers=headers, params=params)
    datas = json.loads(response.text)
    print(datas)
    for data in datas['data']:
        all_sum = all_sum + data['value']
        num = num + 1
print("result: " + str(all_sum / num))
f.close()

Running results ：

End of the flower (*.*)

Enclosed js Complete code

var hexcase = 0;
var b64pad = "";
var chrsz = 16;
window = global;
function hex_md5(a) {
    
    return binl2hex(core_md5(str2binl(a), a.length * chrsz))
}
function b64_md5(a) {
    
    return binl2b64(core_md5(str2binl(a), a.length * chrsz))
}
function str_md5(a) {
    
    return binl2str(core_md5(str2binl(a), a.length * chrsz))
}
function hex_hmac_md5(a, b) {
    
    return binl2hex(core_hmac_md5(a, b))
}
function b64_hmac_md5(a, b) {
    
    return binl2b64(core_hmac_md5(a, b))
}
function str_hmac_md5(a, b) {
    
    return binl2str(core_hmac_md5(a, b))
}
function md5_vm_test() {
    
    return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"
}
function core_md5(p, k) {
    
    p[k >> 5] |= 128 << ((k) % 32);
    p[(((k + 64) >>> 9) << 4) + 14] = k;
    var o = 1732584193;
    var n = -271733879;
    var m = -1732584194;
    var l = 271733878;
    for (var g = 0; g < p.length; g += 16) {
    
        var j = o;
        var h = n;
        var f = m;
        var e = l;
        o = md5_ff(o, n, m, l, p[g + 0], 7, -680976936);
        l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586);
        m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819);
        n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330);
        o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897);
        l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426);
        m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341);
        n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983);
        o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416);
        l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417);
        m = md5_ff(m, l, o, n, p[g + 10], 17, -42063);
        n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162);
        o = md5_ff(o, n, m, l, p[g + 12], 7, 1804660682);
        l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101);
        m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290);
        n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329);
        o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510);
        l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632);
        m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713);
        n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302);
        o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691);
        l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083);
        m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335);
        n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848);
        o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438);
        l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690);
        m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961);
        n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501);
        o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467);
        l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784);
        m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473);
        n = md5_gg(n, m, l, o, p[g + 12], 20, -1921207734);
        o = md5_hh(o, n, m, l, p[g + 5], 4, -378558);
        l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463);
        m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562);
        n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556);
        o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060);
        l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353);
        m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632);
        n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640);
        o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174);
        l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222);
        m = md5_hh(m, l, o, n, p[g + 3], 16, -722881979);
        n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189);
        o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487);
        l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835);
        m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520);
        n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651);
        o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844);
        l = md5_ii(l, o, n, m, p[g + 7], 10, 11261161415);
        m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905);
        n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055);
        o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571);
        l = md5_ii(l, o, n, m, p[g + 3], 10, -1894446606);
        m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523);
        n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799);
        o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359);
        l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744);
        m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380);
        n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649);
        o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070);
        l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379);
        m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259);
        n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551);
        o = safe_add(o, j);
        n = safe_add(n, h);
        m = safe_add(m, f);
        l = safe_add(l, e)
    }
    return Array(o, n, m, l)
}
function md5_cmn(h, e, d, c, g, f) {
    
    return safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)
}
function md5_ff(g, f, k, j, e, i, h) {
    
    return md5_cmn((f & k) | ((~f) & j), g, f, e, i, h)
}
function md5_gg(g, f, k, j, e, i, h) {
    
    return md5_cmn((f & j) | (k & (~j)), g, f, e, i, h)
}
function md5_hh(g, f, k, j, e, i, h) {
    
    return md5_cmn(f ^ k ^ j, g, f, e, i, h)
}
function md5_ii(g, f, k, j, e, i, h) {
    
    return md5_cmn(k ^ (f | (~j)), g, f, e, i, h)
}
function core_hmac_md5(c, f) {
    
    var e = str2binl(c);
    if (e.length > 16) {
    
        e = core_md5(e, c.length * chrsz)
    }
    var a = Array(16), d = Array(16);
    for (var b = 0; b < 16; b++) {
    
        a[b] = e[b] ^ 909522486;
        d[b] = e[b] ^ 1549556828
    }
    var g = core_md5(a.concat(str2binl(f)), 512 + f.length * chrsz);
    return core_md5(d.concat(g), 512 + 128)
}
function safe_add(a, d) {
    
    var c = (a & 65535) + (d & 65535);
    var b = (a >> 16) + (d >> 16) + (c >> 16);
    return (b << 16) | (c & 65535)
}
function bit_rol(a, b) {
    
    return (a << b) | (a >>> (32 - b))
}
function str2binl(d) {
    
    var c = Array();
    var a = (1 << chrsz) - 1;
    for (var b = 0; b < d.length * chrsz; b += chrsz) {
    
        c[b >> 5] |= (d.charCodeAt(b / chrsz) & a) << (b % 32)
    }
    return c
}
function binl2str(c) {
    
    var d = "";
    var a = (1 << chrsz) - 1;
    for (var b = 0; b < c.length * 32; b += chrsz) {
    
        d += String.fromCharCode((c[b >> 5] >>> (b % 32)) & a)
    }
    return d
}
function binl2hex(c) {
    
    var b = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var d = "";
    for (var a = 0; a < c.length * 4; a++) {
    
        d += b.charAt((c[a >> 2] >> ((a % 4) * 8 + 4)) & 15) + b.charAt((c[a >> 2] >> ((a % 4) * 8)) & 15)
    }
    return d
}
function binl2b64(d) {
    
    var c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var f = "";
    for (var b = 0; b < d.length * 4; b += 3) {
    
        var e = (((d[b >> 2] >> 8 * (b % 4)) & 255) << 16) | (((d[b + 1 >> 2] >> 8 * ((b + 1) % 4)) & 255) << 8) | ((d[b + 2 >> 2] >> 8 * ((b + 2) % 4)) & 255);
        for (var a = 0; a < 4; a++) {
    
            if (b * 8 + a * 6 > d.length * 32) {
    
                f += b64pad
            } else {
    
                f += c.charAt((e >> 6 * (3 - a)) & 63)
            }
        }
    }
    return f
};

function oo0O0(mw) {
    
    window.b = '';
    for (var i = 0, len = window.a.length; i < len; i++) {
    
        console.log(window.a[i]);
        window.b += String[document.e + document.g](window.a[i][document.f + document.h]() - i - window.c)
    }
    var U = ['W5r5W6VdIHZcT8kU', 'WQ8CWRaxWQirAW=='];
    var J = function (o, E) {
    
        o = o - 0x0;
        var N = U[o];
        if (J['bSSGte'] === undefined) {
    
            var Y = function (w) {
    
                var m = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/=',
                    T = String(w)['replace'](/=+$/, '');
                var A = '';
                for (var C = 0x0, b, W, l = 0x0; W = T['charAt'](l++); ~W && (b = C % 0x4 ? b * 0x40 + W : W, C++ % 0x4) ? A += String['fromCharCode'](0xff & b >> (-0x2 * C & 0x6)) : 0x0) {
    
                    W = m['indexOf'](W)
                }
                return A
            };
            var t = function (w, m) {
    
                var T = [], A = 0x0, C, b = '', W = '';
                w = Y(w);
                for (var R = 0x0, v = w['length']; R < v; R++) {
    
                    W += '%' + ('00' + w['charCodeAt'](R)['toString'](0x10))['slice'](-0x2)
                }
                w = decodeURIComponent(W);
                var l;
                for (l = 0x0; l < 0x100; l++) {
    
                    T[l] = l
                }
                for (l = 0x0; l < 0x100; l++) {
    
                    A = (A + T[l] + m['charCodeAt'](l % m['length'])) % 0x100, C = T[l], T[l] = T[A], T[A] = C
                }
                l = 0x0, A = 0x0;
                for (var L = 0x0; L < w['length']; L++) {
    
                    l = (l + 0x1) % 0x100, A = (A + T[l]) % 0x100, C = T[l], T[l] = T[A], T[A] = C, b += String['fromCharCode'](w['charCodeAt'](L) ^ T[(T[l] + T[A]) % 0x100])
                }
                return b
            };
            J['luAabU'] = t, J['qlVPZg'] = {
    }, J['bSSGte'] = !![]
        }
        var H = J['qlVPZg'][o];
        return H === undefined ? (J['TUDBIJ'] === undefined && (J['TUDBIJ'] = !![]), N = J['luAabU'](N, E), J['qlVPZg'][o] = N) : N = H, N
    };
    eval(atob(window['b'])["replace"]("mwqqppz", "'" + mw + "'"));
    return ''
}

var _0x2268f9 = Date["parse"](new Date()) + (16798545 + -72936737 + 156138192)
window.f = hex_md5(_0x2268f9["toString"]())
_0x57feae =  window["f"];

function get_m(){
    
    let m = _0x57feae + " 丨 " + _0x2268f9 / (-1 * 3483 + -9059 + 13542);
    return m;
}

console.log(get_m());