文章目录
混淆的原理:就是把原本清晰的代码故意搞得花里胡哨,让局外人看不懂;
混淆的目的:让逆向者很难理解代码的意图,无法读懂混淆之后的代码;
一般混淆的对象为
- 1、混淆常量的值和名称
- 2、混淆逻辑,混淆代码的执行流程
JavaScript支持多个国家的语言
- 1、可以使用其他国家的语言来写JS代码并且正常运行;
- 2、可以将写好的JS代码,使用其他国家的语言进行转译后拿来运行;
- 3、目的:是让逆向者很难理解代码的意图
一、EVAL & constructor
eval介绍:V8引擎定义的方法,具有执行JS代码的功能,一般用于隐藏真实代码,嵌套很多个eval;
案例一:eval(“function xx(){return 10} xx()”) # 可以将JS代码写成文本类型;
案例二嵌套eval:eval(“eval(‘function xx(){return 10} xx()’)”) # 一般会将文本代码进行加密;
案例二拓展:eval(atob(‘ZXZhbCgiZnVuY3Rpb24geHgoKXtyZXR1cm4gMTB9IHh4KCkiKQ==’))# 将文本代码进行base64编码;
通过constructor运行JS代:
[0].constructor.constructor("return 1+3")()
通过constructor运行JS代:
[0]['constructor']['constructor']("return 1+3")()
二、AA混淆
在线加密网址:https://www.sojson.com/aaencode.html
明文:
var xiaozhou = "1024"
下面是AA混淆后的代码
゚ω゚ノ =/`m´)ノ ~┻━┻ //*´∇`sojson.com*/['_'];
o =(゚ー゚)= _ =3;
c =(゚Θ゚)=(゚ー゚)-(゚ー゚);(゚Д゚)=(゚Θ゚)=(o ^ _ ^ o)/(o ^ _ ^ o);(゚Д゚)={
゚Θ゚:'_',
゚ω゚ノ:((゚ω゚ノ ==3)+'_')[゚Θ゚],
゚ー゚ノ:(゚ω゚ノ +'_')[o ^ _ ^ o -(゚Θ゚)],
゚Д゚ノ:((゚ー゚ ==3)+'_')[゚ー゚]};(゚Д゚)[゚Θ゚]=((゚ω゚ノ ==3)+'_')[c ^ _ ^ o];(゚Д゚)['c']=((゚Д゚)+'_')[(゚ー゚)+(゚ー゚)-(゚Θ゚)];(゚Д゚)['o']=((゚Д゚)+'_')[゚Θ゚];(゚o゚)=(゚Д゚)['c']+(゚Д゚)['o']+(゚ω゚ノ +'_')[゚Θ゚]+((゚ω゚ノ ==3)+'_')[゚ー゚]+((゚Д゚)+'_')[(゚ー゚)+(゚ー゚)]+((゚ー゚ ==3)+'_')[゚Θ゚]+((゚ー゚ ==3)+'_')[(゚ー゚)-(゚Θ゚)]+(゚Д゚)['c']+((゚Д゚)+'_')[(゚ー゚)+(゚ー゚)]+(゚Д゚)['o']+((゚ー゚ ==3)+'_')[゚Θ゚];(゚Д゚)['_']=(o ^ _ ^ o)[゚o゚][゚o゚];(゚ε゚)=((゚ー゚ ==3)+'_')[゚Θ゚]+(゚Д゚).゚Д゚ノ +((゚Д゚)+'_')[(゚ー゚)+(゚ー゚)]+((゚ー゚ ==3)+'_')[o ^ _ ^ o - ゚Θ゚]+((゚ー゚ ==3)+'_')[゚Θ゚]+(゚ω゚ノ +'_')[゚Θ゚];(゚ー゚)+=(゚Θ゚);(゚Д゚)[゚ε゚]='\\';(゚Д゚).゚Θ゚ノ =(゚Д゚ + ゚ー゚)[o ^ _ ^ o -(゚Θ゚)];(o゚ー゚o)=(゚ω゚ノ +'_')[c ^ _ ^ o];(゚Д゚)[゚o゚]='\"';(゚Д゚)['_']((゚Д゚)['_'](゚ε゚ +(゚Д゚)[゚o゚]+(゚Д゚)[゚ε゚]+(゚Θ゚)+((o ^ _ ^ o)+(o ^ _ ^ o))+((o ^ _ ^ o)+(o ^ _ ^ o))+(゚Д゚)[゚ε゚]+(゚Θ゚)+(゚ー゚)+(゚Θ゚)+(゚Д゚)[゚ε゚]+(゚Θ゚)+((o ^ _ ^ o)+(o ^ _ ^ o))+((o ^ _ ^ o)-(゚Θ゚))+(゚Д゚)[゚ε゚]+(゚ー゚)+(c ^ _ ^ o)+(゚Д゚)[゚ε゚]+(゚Θ゚)+((゚ー゚)+(o ^ _ ^ o))+(c ^ _ ^ o)+(゚Д゚)[゚ε゚]+(゚Θ゚)+((゚ー゚)+(゚Θ゚))+(゚Θ゚)+(゚Д゚)[゚ε゚]+(゚Θ゚)+(゚ー゚)+(゚Θ゚)+(゚Д゚)[゚ε゚]+(゚Θ゚)+((゚ー゚)+(゚Θ゚))+((゚ー゚)+(o ^ _ ^ o))+(゚Д゚)[゚ε゚]+(゚Θ゚)+((゚ー゚)+(o ^ _ ^ o))+((o ^ _ ^ o)-(゚Θ゚))+(゚Д゚)[゚ε゚]+(゚Θ゚)+((゚ー゚)+(゚Θ゚))+(c ^ _ ^ o)+(゚Д゚)[゚ε゚]+(゚Θ゚)+((゚ー゚)+(゚Θ゚))+((゚ー゚)+(o ^ _ ^ o))+(゚Д゚)[゚ε゚]+(゚Θ゚)+((o ^ _ ^ o)+(o ^ _ ^ o))+((゚ー゚)+(゚Θ゚))+(゚Д゚)[゚ε゚]+(゚ー゚)+(c ^ _ ^ o)+(゚Д゚)[゚ε゚]+((゚ー゚)+(o ^ _ ^ o))+((゚ー゚)+(゚Θ゚))+(゚Д゚)[゚ε゚]+(゚ー゚)+(c ^ _ ^ o)+(゚Д゚)[゚ε゚]+(゚ー゚)+((o ^ _ ^ o)-(゚Θ゚))+(゚Д゚)[゚ε゚]+((o ^ _ ^ o)+(o ^ _ ^ o))+(゚Θ゚)+(゚Д゚)[゚ε゚]+((o ^ _ ^ o)+(o ^ _ ^ o))+(c ^ _ ^ o)+(゚Д゚)[゚ε゚]+((o ^ _ ^ o)+(o ^ _ ^ o))+((o ^ _ ^ o)-(゚Θ゚))+(゚Д゚)[゚ε゚]+((o ^ _ ^ o)+(o ^ _ ^ o))+(゚ー゚)+(゚Д゚)[゚ε゚]+(゚ー゚)+((o ^ _ ^ o)-(゚Θ゚))+(゚Д゚)[゚o゚])(゚Θ゚))((゚Θ゚)+(゚Д゚)[゚ε゚]+((゚ー゚)+(゚Θ゚))+(゚Θ゚)+(゚Д゚)[゚o゚]);
三、JJ混淆
在线加密网址:https://www.sojson.com/aaencode.html
加密明文:
console.log("xiaozhou")
下面是AA混淆后的代码
sojson =~[];/*sojson.com*/
sojson ={
___:++sojson,/*sojson.com*/
$$$$:(![]+"")[sojson],
__$:++sojson,
$_$_:(![]+"")[sojson],
_$_:++sojson,
$_$$:({}+"")[sojson],
$$_$:(sojson[sojson]+"")[sojson],
_$$:++sojson,
$$$_:(!""+"")[sojson],
$__:++sojson,
$_$:++sojson,
$$__:({}+"")[sojson],
$$_:++sojson,
$$$:++sojson,
$___:++sojson,
$__$:++sojson
};
sojson.$_ =(sojson.$_ = sojson +"")[sojson.$_$]+(sojson._$ = sojson.$_[sojson.__$])+(sojson.$$/*sojson.com*/=(sojson.$ +"")[sojson.__$])+((!sojson)+"")[sojson._$$]+(sojson.__ = sojson.$_[sojson.$$_])+(sojson.$ =(!""+"")[sojson.__$])+(sojson._ =(!""+"")[sojson._$_])+ sojson.$_[sojson.$_$]+ sojson.__ + sojson._$ + sojson.$;/*sojson.com*/
sojson.$$ = sojson.$ +(!""+"")[sojson._$$]+ sojson.__ + sojson._ + sojson.$ + sojson.$$/*sojson.com*/;
sojson.$ =(sojson.___)[sojson.$_][sojson.$_];
sojson.$(sojson.$(sojson.$$ +"\""+ sojson.$$__ + sojson._$ +"\\"+ sojson.__$ + sojson.$_$ + sojson.$$_ +"\\"+ sojson.__$ + sojson.$$_ + sojson._$$ + sojson._$ +(![]+"")[sojson._$_]+ sojson.$$$_ +"."+(![]+"")[sojson._$_]+ sojson._$ +"\\"+ sojson.__$ + sojson.$__ + sojson.$$$ +"(\\\"\\"+ sojson.__$ + sojson.$$$ + sojson.___ +"\\"+ sojson.__$ + sojson.$_$ + sojson.__$ + sojson.$_$_ + sojson._$ +"\\"+ sojson.__$ + sojson.$$$ + sojson._$_ +"\\"+ sojson.__$ + sojson.$_$ + sojson.___ + sojson._$ + sojson._ +"\\\")"+"\"")())(sojson ={
___:++sojson,
$$$$:(![]+"")[sojson]});
在28行处拼成了console.log(“xiaozhou”),并且调用执行;
四、JSFUCK
在线加密网址:https://www.sojson.com/aaencode.html
加密明文:
console.log("3+3")
下面是AA混淆后的代码
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针对JSFUCK有两种方式
- 1、使用解密工具直接解密分析 JSFUCK解密工具:https://lelinhtinh.github.io/de4js/ JSFUCK解密工具:http://codertab.com/JsUnFuck 推荐资源:http://www.manongjc.com/detail/61-bbcwpooudjtlvnz.html![在这里插入图片描述](https://img-blog.csdnimg.cn/c73752214c594969aae1c0c68aa1d0fe.png)
- 2、打断点单步调试
五、针对混淆的方法
混淆提示
- 1、点号(.)是无法混淆的;
- 2、冒号(:)是无法混淆的;
简单hook
在控制台编写JS运行:
eval = function(){debugger;}
Function = function(){debugger;}
指定方法名进行hook:sojson.$ = function(){debugger;}
当function被调用时则会断住
- 1、通过控制台打印arguments参数进行分析;
- 2、通过二次断点进入function跟值进行分析;
在JJ混淆的案例基础上,进行hook扩展;
总结
以上就是今天要讲的内容,本文仅介绍了简单的JS混淆,后续会发布实际的案例博文,请关注我的主页;
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