前言
好久没有写猿人学的分析了,今天来分析一波
打开网址:
同样的,也很轻易的拿到接口,
然后这个接口里的请求参数又是迷人的m,m就是我们的目标了
分析
老规矩,搜索:
搜一堆出来,感觉都不太靠谱
那咋办?先看特征,看这个长度是多少的,卧槽,这个长度有点少见了
点调用栈看看:
看到这个就很可疑了
为啥这么说,dispatch分发请求,匿名函数操作,实际的request,所以,关键的逻辑一定在这个request或者匿名函数anonymous前后,再看js名字就叫webpack,那就是webpack打包的,那前面才分析过webpack的东西,不用怕,点进去看:
进来都到这里,打上断点,翻页看看,这不就找到了吗,看着webpack唬人,感觉没两样啊
然后看逻辑,m的值就是n[e(528)](btoa, p_s)生成的了,然后传入的参数btoa,这个可以直接调用,不用多说,再看后面的p_s,定义就在上面,那就只剩n[e(528)]这个不知道啥东西了,鼠标放上去,发现,这个就是前面说的匿名函数anonymous了
点过去,发现就在上面,然后看逻辑,第一个参数是个函数,然后把第二个参数传入函数直接返回,这个不就是python里的装饰器嘛,
那么,也就是说,实际的加密逻辑就是btoa(p_s)
控制台操作下:
这不就出来了吗
然后,前面js逆向安全专题里说了,btoa就是个base64的函数,直接忽略了,python里直接就有,主要是后面的这个参数:
p_s = Date[e(496)](new Date)[e(517)]()
时间相关的都好说,就差这个e(517)和e(496)了,控制台看是啥东西:
最后的结果:
然后这个时间戳的话,是毫秒级别的,13位
调试
那行,直接在python里搞一个看行不行
突然感觉跟预期的有点不一样,这个长度不对啊
首先,整个结果就不对的,
然后再用node操作也报错:
从node版本16开始,原生支持atob,btoa,但是之前不支持
拿得从长记忆了,控制台打印下:
双击返回的,进入,如下,这他妈一看,典型的obfuscator混淆啊(别问我怎么看出来的)
既然是ob,先把这个btoa的上级整个抠出来的,此时有两套方案
- 第一个可以用ast对ob混淆反混淆,然后整体逻辑就会很清晰,后续就能很快解决问题,前提得回ast,且熟悉ob混淆逻辑
- 第二个不用反混淆,直接补环境也是可以的,但是这个补环境时,如果环境没补好,容易出现错误的结果
ob混淆的话,得花好几期的博客文章才能说清楚,为了照顾对这方面不太理解的朋友,所以我选用第二个方案,补环境,抠代码:
如下,抠出来后,执行,
把u补上,找到u:
补上并执行:
继续补_0x34e7并执行:
补f,同同时,把标注出来的删了
补完,这里的f用了u,所以要放在u下面
继续补d
继续补window
补md5
补n,其实这里看到,这个n就是webpack的加载器,或者叫分发器
出现如下,r,但是刚才的n并没有带入参数啊,
再看源站里的,此时才发下,n并不是刚才定位到的,而是上面的n
所以还是不能信鼠标放上去的跳转啊,尤其这种就一个字母,很容易链接错,因为作用域的问题,你很有可能链接到同名的其他地方去了,像上面就是
看到用了个_0x4c28,干脆把这里都复制下来:
执行,终于有结果了
调试
然后再在浏览器里执行看看,注意,我直接把window = global删了,window.md5直接改成了md5,因为浏览器环境里自带有window对象,所以不用补了
结果也是有的,那么怎么确定这个结果就跟官方的一样呢,用同一个时间地址就可以了:
先看,这是官方的结果:
把这个值直接放到扣出来的代码执行,node里:
浏览器的source - snippet里
三个值都不一样,那多半也没法用啊,哪里有问题呢?
再从头看下:
应该就是检测了环境,刚才补的环境还是有问题,想到刚才的delete那里:
这里只能一行一行看了,可以对这里打上断点一点点看了:
然后这里看到这个n:
刚才我们也补了一个n,对比下区别,下面是自己补的,这个值明显就不对了啊,怎么办
看到源网站的n:
那就把相关的都补上吧,放在for循环上边点:
好的,现在看,然后发现,即使我把时间写死了,每次执行还是会有不同的结果,那就不多说了,直接拿来请求看看能不能有正常结果吧,先稍微改下js文件:
python调用:
那就可以,整理下求和吧
填入答案:
js代码:
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-176418897); continue; case "25": w = i.UXeVn(u, w, b, x, T, e[d + 0], 11, -358537222); continue; case "26": b = i.UXeVn(l, b, x, T, w, e[i[r(62)](d, 1)], 5, -165796510); continue; case "27": b = i.UXeVn(u, b, x, T, w, e[i[r(62)](d, 13)], 4, 681279174); continue; case "28": b = i[r(12)](l, b, x, T, w, e[i[r(138)](d, 9)], 5, 568446438); continue; case "29": w = i.yMPhx(c, w, b, x, T, e[d + 7], 10, 11261161415); continue; case "30": var g = w; continue; case "31": b = c(b, x, T, w, e[i.yGmJD(d, 8)], 6, 1873313359); continue; case "32": x = i.aFxRD(f, x, y); continue; case "33": T = i[r(12)](l, T, w, b, x, e[i[r(121)](d, 15)], 14, -660478335); continue; case "34": T = i.kHuTw(u, T, w, b, x, e[d + 3], 16, -722881979); continue; case "35": b = i[r(50)](l, b, x, T, w, e[i[r(121)](d, 5)], 5, -701520691); continue; case "36": T = l(T, w, b, x, e[i[r(121)](d, 3)], 14, -187363961); continue; case "37": T = i[r(142)](u, T, w, b, x, e[i.QgSUn(d, 7)], 16, -155497632); continue; case "38": b = i.FcXlo(u, b, x, T, w, e[i.koePJ(d, 5)], 4, -378558); continue; case "39": w = i[r(142)](u, w, b, x, T, e[i[r(90)](d, 12)], 11, -421815835); continue; case "40": T = i[r(59)](u, T, w, b, x, e[i[r(28)](d, 15)], 16, 530742520); continue; case "41": x = i.wvVCN(s, x, T, w, b, e[d + 15], 22, 1236531029); continue; case "42": x = i[r(59)](l, x, T, w, b, e[i[r(119)](d, 4)], 20, -405537848); continue; case "43": b = i[r(59)](s, b, x, T, w, e[i.lvwPz(d, 0)], 7, -680976936); continue; case "44": b = i[r(59)](u, b, x, T, w, e[i[r(45)](d, 1)], 4, -1530992060); continue; case "45": x = i.nCrbn(u, x, T, w, b, e[i[r(129)](d, 14)], 23, -35311556); continue; case "46": b = c(b, x, T, w, e[i[r(42)](d, 12)], 6, 1700485571); continue; case "47": x = i[r(7)](u, x, T, w, b, e[i.kaQlD(d, 2)], 23, -995338651); continue; case "48": T = c(T, w, b, x, e[d + 6], 15, -1560198380); continue; case "49": w = i[r(145)](l, w, b, x, T, e[i[r(107)](d, 6)], 9, -1069501632); continue; case "50": x = i[r(134)](c, x, T, w, b, e[i[r(89)](d, 1)], 21, -2054922799); continue; case "51": x = i.fmdcS(l, x, T, w, b, e[d + 8], 20, 1163531501); continue; case "52": x = i[r(15)](c, x, T, w, b, e[i[r(9)](d, 13)], 21, 1309151649); continue; case "53": x = i[r(15)](s, x, T, w, b, e[i[r(56)](d, 11)], 22, -1990404162); continue; case "54": w = i[r(6)](s, w, b, x, T, e[i[r(32)](d, 13)], 12, -40341101); continue; case "55": x = i.sFtiw(s, x, T, w, b, e[i.UAFHv(d, 7)], 22, -45705983); continue; case "56": T = i.sFtiw(s, T, w, b, x, e[i.MFmWH(d, 6)], 17, -1473231341); continue; case "57": w = i[r(99)](s, w, b, x, T, e[i.MFmWH(d, 1)], 12, -389564586); continue; case "58": x = c(x, T, w, b, e[i[r(39)](d, 9)], 21, -343485551); continue; case "59": b = i[r(113)](c, b, x, T, w, e[i[r(39)](d, 4)], 6, -145523070); continue; case "60": T = i.bRLIN(s, T, w, b, x, e[i[r(39)](d, 10)], 17, -42063); continue; case "61": var v = T; continue; case "62": b = i[r(66)](c, b, x, T, w, e[d + 0], 6, -198630844); continue; case "63": w = i[r(66)](c, w, b, x, T, e[i[r(13)](d, 15)], 10, -30611744); continue; case "64": x = c(x, T, w, b, e[d + 5], 21, -57434055); continue; case "65": T = i[r(29)](l, T, w, b, x, e[i[r(13)](d, 7)], 14, 1735328473); continue; case "66": w = i[r(29)](c, w, b, x, T, e[i[r(79)](d, 11)], 10, -1120210379); continue; case "67": var y = x; continue; case "68": w = i[r(1)](l, w, b, x, T, e[d + 10], 9, 38016083); continue; case "69": T = i[r(1)](s, T, w, b, x, e[i[r(79)](d, 14)], 17, -1502002290); continue; case "70": T = i.SUrST(c, T, w, b, x, e[i[r(79)](d, 2)], 15, 718787259); continue; case "71": T = l(T, w, b, x, e[i[r(81)](d, 11)], 14, 643717713); continue } break } continue; case "1": var b = 1732584193; continue; case "2": return Array(b, x, T, w); case "3": e[i.MXnIN(n, 5)] |= i[r(23)](128, i[r(54)](n, 32)); continue; case "4": var x = -271733879; continue; case "5": var w = 271733878; continue; case "6": e[i.BQgZQ(i[r(115)](n + 64, 9), 4) + 14] = n; continue; case "7": var T = -1732584194; continue } break } } function a(e, n, r, o, a, s) { var l = t; return f(i.BtzmV(d, i[l(44)](f, i.dbmfK(f, n, e), i[l(30)](f, o, s)), a), r) } function s(e, n, r, o, s, l, u) { var c = t; return a(i[c(143)](i[c(101)](n, r), i[c(101)](~n, o)), e, n, s, l, u) } function l(e, n, r, o, s, l, u) { var c = t; return i[c(122)](a, i[c(143)](i.ZpUiH(n, o), i.ZpUiH(r, ~o)), e, n, s, l, u) } function u(e, n, r, o, s, l, u) { return i[t(122)](a, i.tsNzQ(n ^ r, o), e, n, s, l, u) } function c(e, n, r, o, s, l, u) { var c = t; return i[c(122)](a, i[c(130)](r, i[c(41)](n, ~o)), e, n, s, l, u) } function f(e, n) { var r = t , o = i[r(95)](65535 & e, i.iqfMz(n, 65535)) , a = i[r(95)](e >> 16, i[r(97)](n, 16)) + i[r(97)](o, 16); return i[r(103)](i[r(84)](a, 16), i[r(105)](o, 65535)) } function d(e, n) { var r = t; return i.abYok(e << n, e >>> i[r(8)](32, n)) } function p(e) { for (var n = t, r = i[n(137)](Array), o = i[n(8)](i.vRqUp(1, 16), 1), a = 0; a < i.FDfcp(e[n(108)], 16); a += 16) r[i[n(97)](a, 5)] |= i[n(102)](i[n(27)](e[n(127)](i[n(26)](a, 16)), o), i[n(54)](a, 32)); return r } function h(e) { for (var n = t, r = i[n(49)], o = "", a = 0; i.iXQwu(a, i[n(74)](e[n(108)], 4)); a++) o += i.xgzfr(r[n(64)](15 & i[n(36)](e[i[n(36)](a, 2)], i[n(46)](i[n(74)](a % 4, 8), 4))), r[n(64)](15 & i.wWwRM(e[a >> 2], i[n(47)](a % 4, 8)))); return o } return i[t(0)]((function (e) { var n = t; return i[n(144)](h, i[n(76)](o, i.vyNVU(p, e), 16 * e[n(108)])) } ), e) } var _0x34e7 = [ "split", "ABHICESQWK", "FKByN", "U987654321", "lmHcG", "dICfr", "Szksx", "Bgrij", "iwnNJ", "jihgfdecba", "GfTek", "gfdecbaZXY", "constructo", "QIoXW", "jLRMs", "AqLWq", "0zyxwvutsr", "TKgNw", "eMnqD", "thjIz", "btoa", "MNPQRSTWXY", "oPsqh", "niIlq", "evetF", "LVZVH", "fYWEX", "kmnprstwxy", "aYkvo", "tsrqpomnlk", "HfLqY", "aQCDK", "lGBLj", "test", "3210zyxwvu", "QWK2Fi", "return /\" ", "hsJtK", "jdwcO", "SlFsj", "OWUOc", "LCaAn", "[^ ]+)+)+[", "FAVYf", "2Fi+987654", "floor", "join", "EuwBW", "OXYrZ", "charCodeAt", "SkkHG", "iYuJr", "GwoYF", "kPdGe", "cVCcp", "INQRH", "INVALID_CH", "charAt", "push", "apply", "lalCJ", "kTcRS", "+ this + \"", "ykpOn", "gLnjm", "gmBaq", "kukBH", "dvEWE", "SFKLi", "^([^ ]+( +", "qpomnlkjih", "^ ]}", "pHtmC", "length" ] var l = function (e, t) { return _0x34e7[e -= 188] } , u = l function d(e) { var t = u , n = {}; n[t(214)] = function (e, t) { return e || t } , n.bWcgB = function (e, t) { return e * t } , n[t(227)] = "ABCDEFGHJK" + t(209) + "Zabcdefhij" + t(215) + "z2345678"; for (var r = n, o = "1|3|0|4|2|5"[t(188)]("|"), a = 0; ;) { switch (o[a++]) { case "0": var s = l[t(261)]; continue; case "1": e = r[t(214)](e, 32); continue; case "2": for (i = 0; i < e; i++) c += l[t(245)](Math[t(233)](r.bWcgB(Math.random(), s))); continue; case "3": var l = r[t(227)]; continue; case "4": var c = ""; continue; case "5": return c } break } } function btoa(e) { var t = u, r = {}; var f = u(191) + u(204) + u(258) + u(199) + "WVUTSRQPON" + u(189) + u(232) + u(222) + u(217) + u(197) + "ZXYWVUTSRQPONABHICES" + u(223); r.TGmSp = t(244) + "ARACTER_ERR", r[t(238)] = t(224) + t(250) + "/", r[t(205)] = "^([^ ]+( +" + t(230) + t(259), r.aYkvo = function (e) { return e(); }, r[t(254)] = function (e, t) { return e % t; }, r.evetF = function (e, t) { return e >> t; }, r.GfTek = t(196), r[t(260)] = function (e, t) { return e << t; }, r[t(229)] = function (e, t) { return e | t; }, r[t(242)] = function (e, t) { return e << t; }, r[t(228)] = function (e, t) { return e & t; }, r[t(207)] = function (e, t) { return e << t; }, r[t(202)] = function (e, t) { return e & t; }, r.jdwcO = function (e, t) { return e === t; }, r.kPdGe = t(231), r[t(195)] = t(213), r[t(201)] = function (e, t) { return e & t; }, r[t(206)] = function (e, t) { return e == t; }, r[t(219)] = function (e, t) { return e + t; }, r[t(220)] = function (e, t) { return e(t); }; var i = r; if (/([^\u0000-\u00ff])/.test(e)) { throw new Error(i.TGmSp); } function n(r) { if (t[r]) return t[r].exports; var i = t[r] = { exports: {} }; return e[r].call(i.exports, i, i.exports, n), i.exports } n.g = function () { if ("object" == typeof globalThis) return globalThis; try { return this || new Function("return this")() } catch (e) { if ("object" == typeof window) return window } }() for (var o, a, s, l = 0, c = []; l < e[t(261)];) { switch (a = e[t(237)](l), s = i.kukBH(l, 6)) { case 0: c[t(246)](f[t(245)](i[t(212)](a, 2))); break; case 1: try { "WhHMm" === i[t(198)] || n.g && c[t(246)](f[t(245)](i.pHtmC(2 & o, 3) | i.evetF(a, 4))); } catch (e) { c[t(246)](f[t(245)](i[t(229)](i.cVCcp(3 & o, 4), a >> 4))); } break; case 2: c[t(246)](f[t(245)](i[t(229)](i[t(242)](15 & o, 2), i.evetF(a, 6)))), c[t(246)](f[t(245)](i[t(228)](a, 63))); break; case 3: c[t(246)](f[t(245)](i[t(212)](a, 3))); break; case 4: c.push(f[t(245)](i[t(229)](i[t(207)](i.OWUOc(o, 4), 6), i[t(212)](a, 6)))); break; case 5: c[t(246)](f[t(245)](i[t(229)](i[t(207)](i[t(202)](o, 15), 4), a >> 8))), c.push(f.charAt(i[t(202)](a, 63))); } o = a, l++; } return 0 == s ? i[t(226)](i[t(241)], i[t(195)]) || (c[t(246)](f[t(245)](i[t(201)](o, 3) << 4)), c.push("FM")) : i.eMnqD(s, 1) && (c[t(246)](f[t(245)]((15 & o) << 2)), c[t(246)]("K")), i[t(219)](i.aQCDK(d(15), window.md5(c[t(234)](""))), i[t(220)](d, 10)); } function get_m() { kk = Date.parse(new Date).toString() console.log(kk) return [btoa(kk), kk] } console.log(get_m())
python代码:
import requests headers = { "authority": "match.yuanrenxue.com", "x-requested-with": "XMLHttpRequest", "sec-ch-ua-mobile": "?0", 'cookie': 'sessionid=换成你的sessionid', "user-agent": "yuanrenxue.project", "sec-ch-ua-platform": "\"Windows\"", "sec-fetch-site": "same-origin", "sec-fetch-mode": "cors", "sec-fetch-dest": "empty", "referer": "https://match.yuanrenxue.com/match/16", "accept-language": "zh-CN,zh;q=0.9" } url = "https://match.yuanrenxue.com/api/match/16" def get_m(): import execjs with open('get_m.js') as f: cont = f.read() js = execjs.compile(cont) result = js.call('get_m') m, ts = result return m, ts def get_page(page): m, ts = get_m() params = { "page": page, "m": m, "t": ts } with requests.get(url, headers=headers, params=params) as response: print(1232123123,response) result = response.json() data = result.get('data') return [d.get('value') for d in data] def get_data(): end = 0 for i in range(1, 6): temp_list = get_page(i) some = sum(temp_list) end += some print('end', end) get_data()
结语
本次直接忽略ob混淆,硬抠webpack代码,一样有结果,难倒是不难,主要有点骚,他改了btoa函数和md5函数的逻辑,不是原生的