JS逆向:猿人学「第一题」难度⭐⭐⭐

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练习网址:https://match.yuanrenxue.com/match/1

分析:

m: 32cbebb50eaf37c1ee75a0fa8894b401丨1670613538

根据调试可知需要分析m参数的加密方式以及后面向时间戳的参数

JS逆向:猿人学「第一题」难度⭐⭐⭐

进入代码后,会发现代码很乱,无法看懂,需要格式化代码,我下面将重要代码贴出来

document.e = 'fromC';
document.f = 'charCo';
document.g = 'harCode';
document.h = 'deAt';
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'])[J('0x0', ']dQW')](J('0x1', 'GTu!'), '\x27' + mw + '\x27'));
                return ''
        }
var _0x2268f9 = Date['\x70\x61\x72\x73\x65'](new Date()) + (16798545 + -72936737 + 156138192)

var _0x57feae = oo0O0(_0x2268f9['\x74\x6f\x53\x74\x72' + '\x69\x6e\x67']()) + window['\x66'];

//解析后

var _0x2268f9 = Date['parse'](new Date()) + (16798545 + -72936737 + 156138192)

var _0x57feae = oo0O0(_0x2268f9['toStr' + 'ing']()) + window['f'];

从代码中分析可得知:

_0x2268f9的值为当前时间戳数值+100000000

_0x57feae就是m的值,首先会进行oo0O0函数调用,然后加上window['f']方法

经过分析oo0O0函数,他会返回一个空的字符串,所以直接忽略这个即可.只有查看window['f']的值

分析到这里就已经卡住了,不知道window['f']到底是个什么东西

但是我们看到一个很可疑的代码,来分析一下这个代码

eval(atob(window['b'])[J('0x0', ']dQW')](J('0x1', 'GTu!'), '\x27' + mw + '\x27'));
JS逆向:猿人学「第一题」难度⭐⭐⭐

在这里有了重大发现,window['f'] 与window.f 是一样的

var hexcase=0;var b64pad="";var chrsz=16;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};
window.f = hex_md5(mwqqppz)

根据上面分析的代码,那么本次的解密过程就已经结束啦!

最终代码:

整理后的代码:

var hexcase = 0;
var b64pad = "";
var chrsz = 16;
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
};

//解密函数
function get_send_str(){
    var timestamp = Date.parse(new Date())+ (16798545 + -72936737 + 156138192);
    return hex_md5(timestamp.toString()) + '丨' + timestamp / 1000
}

console.log(get_send_str())
正文完
JS逆向
发表至： JavaScript
2022-12-24
 
yunyan
版权声明：本站原创文章，由 yunyan 2022-12-24发表，共计12128字。
转载说明：除特殊说明外本站文章皆由CC-4.0协议发布，转载请注明出处。
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