介紹
在我們開始學習反混淆之前，我們首先要了解一下代碼混淆。如果不了解代碼是如何混淆的，我們可能無法成功對代碼進行反混淆，尤其是使用自定義混淆器對其進行混淆時。
什麼是混淆
混淆是一種技術，用于使腳本更難以被人類閱讀，但從技術角度來看，它可以發揮相同的功能，盡管性能可能會較慢。這通常是通過使用混淆工具自動實作的，該工具将代碼作為輸入，并嘗試以更難以閱讀的方式重寫代碼，具體取決于其設計。
例如，代碼混淆器通常将代碼轉換成代碼中使用的所有單詞和符号的字典，然後在執行期間嘗試通過引用字典中的每個單詞和符号來重建原始代碼。以下是一個簡單的 JavaScript 代碼被混淆的示例：
為什麼用混淆？
開發人員考慮混淆代碼的原因有很多。一個常見的原因是隐藏原始代碼及其功能，以防止在未經開發人員許可的情況下重複使用或複制它，進而使對代碼的原始功能進行逆向工程變得更加困難。另一個原因是在處理身份驗證或加密時提供安全層，以防止對代碼中可能發現的漏洞進行攻擊。
必須注意的是，不建議在用戶端進行身份驗證或加密，因為這樣代碼更容易受到攻擊。
然而，混淆最常見的用途是用于惡意行為。攻擊者和惡意行為者通常會混淆其惡意腳本，以阻止入侵檢測和防禦系統檢測其腳本。
基礎混淆
代碼混淆通常不是手動完成的，因為有許多針對各種語言的工具可以自動進行代碼混淆。盡管許多惡意行為者和專業開發人員開發了自己的混淆工具以使反混淆變得更加困難，但許多線上工具都可以這樣做。
明文示例
讓我們以下面這行代碼為例，嘗試對其進行混淆：
console.log('Hello JavaScript Deobfuscation'); 明文運作列印出來是：
Hello JavaScript Deobfuscation
混淆示例
現在，讓我們混淆我們的代碼行，使其更加晦澀難懂。首先，我們将嘗試使用BeautifyTools來混淆我們的代碼：
console.log('Hello JavaScript Deobfuscation'); 混淆輸出
eval(function(p,a,c,k,e,d){e=function(c){return c};if(!''.replace(/^/,String)){while(c--){d[c]=k[c]||c}k=[function(e){return d[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}('0.1(\'2 3 4\');',5,5,'console|log|Hello|JavaScript|Deobfuscation'.split('|'),0,{})) 我們發現我們的代碼變得更加混亂且難以閱讀。我們可以将此代碼複制到https://jsconsole.com，以驗證它仍然執行其主要功能：
雖然加殼器在降低代碼的可讀性方面做得很好，但我們仍然可以看到它的主要字元串以明文形式編寫，這可能會揭示它的一些功能。這就是為什麼我們可能想要尋找更好的方法來混淆我們的代碼。
進階混淆工具
到目前為止，我們已經能夠使我們的代碼變得模糊并且更難以閱讀。但是，該代碼仍然包含明文字元串，這可能會揭示其原始功能。我們将嘗試一些工具，它們應該完全混淆代碼并隐藏其原始功能的任何殘留。
#0x1 JavaScript Obfuscator Tool - JS混淆工具
有一個線上的混淆工具：JavaScript Obfuscator Tool
一個免費且高效的 JavaScript 混淆器（包括對 ES2022 的支援）。使您的代碼更難複制，并防止人們竊取您的工作。這個工具是一個由Timofey Kachalov建立的優秀（和開源） [email protected]的Web UI。
讓我們通路https://obfuscator.io。在單擊 之前obfuscate，我們将更改為:[Strings Transformations]->[String Array Encoding]->Base64如下所示：
現在，我們可以粘貼代碼并單擊obfuscate：
var _0x1a54f6=_0x5936;function _0x5271(){var _0x3bb17a=['otKWodqYnNfIBgPSua','mtb0vNnJt3q','mtKZnfHYt3vnrW','otH1tMPpBNC','mtG2og9jufLKEa','mtaXyKvOD2TP','mJm1oty1ouzyCwLnzW','ntmYmtu5mLr0rKLYwq','Bg9N','mZe2mdC3m2jgvLjizW','ntG3oduWwwrzqwD4','mtaWBwvpzgjc'];_0x5271=function(){return _0x3bb17a;};return _0x5271();}function _0x5936(_0x25a7d9,_0x1f51f9){var _0x5271e3=_0x5271();return _0x5936=function(_0x593653,_0x103659){_0x593653=_0x593653-0x1e3;var _0x38866e=_0x5271e3[_0x593653];if(_0x5936['CXFyxS']===undefined){var _0x55d0c5=function(_0x417d06){var _0x32ee69='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/=';var _0x49cddd='',_0x2f60dc='';for(var _0x22561b=0x0,_0x45c65d,_0x24071e,_0x4b6047=0x0;_0x24071e=_0x417d06['charAt'](_0x4b6047++);~_0x24071e&&(_0x45c65d=_0x22561b%0x4?_0x45c65d*0x40+_0x24071e:_0x24071e,_0x22561b++%0x4)?_0x49cddd+=String['fromCharCode'](0xff&_0x45c65d>>(-0x2*_0x22561b&0x6)):0x0){_0x24071e=_0x32ee69['indexOf'](_0x24071e);}for(var _0x450e46=0x0,_0x71cdac=_0x49cddd['length'];_0x450e46<_0x71cdac;_0x450e46++){_0x2f60dc+='%'+('00'+_0x49cddd['charCodeAt'](_0x450e46)['toString'](0x10))['slice'](-0x2);}return decodeURIComponent(_0x2f60dc);};_0x5936['trxXbR']=_0x55d0c5,_0x25a7d9=arguments,_0x5936['CXFyxS']=!![];}var _0xd2632a=_0x5271e3[0x0],_0x376564=_0x593653+_0xd2632a,_0x6361f9=_0x25a7d9[_0x376564];return!_0x6361f9?(_0x38866e=_0x5936['trxXbR'](_0x38866e),_0x25a7d9[_0x376564]=_0x38866e):_0x38866e=_0x6361f9,_0x38866e;},_0x5936(_0x25a7d9,_0x1f51f9);}(function(_0x4625fd,_0x16a961){var _0x1627a6=_0x5936,_0x5197f8=_0x4625fd();while(!![]){try{var _0x40e3f4=parseInt(_0x1627a6(0x1e7))/0x1*(parseInt(_0x1627a6(0x1e4))/0x2)+parseInt(_0x1627a6(0x1e8))/0x3+-parseInt(_0x1627a6(0x1e6))/0x4*(parseInt(_0x1627a6(0x1ed))/0x5)+-parseInt(_0x1627a6(0x1ec))/0x6*(parseInt(_0x1627a6(0x1e5))/0x7)+parseInt(_0x1627a6(0x1e9))/0x8+-parseInt(_0x1627a6(0x1eb))/0x9+parseInt(_0x1627a6(0x1e3))/0xa*(parseInt(_0x1627a6(0x1ee))/0xb);if(_0x40e3f4===_0x16a961)break;else _0x5197f8['push'](_0x5197f8['shift']());}catch(_0x5f50ba){_0x5197f8['push'](_0x5197f8['shift']());}}}(_0x5271,0xaf4ae),console[_0x1a54f6(0x1ea)]('Hello\x20JavaScript\x20Deobfuscation')); 這段代碼顯然更加混亂，我們看不到原始代碼的任何殘餘。我們現在可以嘗試在https://jsconsole.com中運作它，以驗證它是否仍然執行其原始功能。嘗試使用https://obfuscator.io中的混淆設定來生成更多混淆代碼，然後嘗試在https://jsconsole.com中重新運作它以驗證它仍然執行其原始功能。
現在我們應該清楚地了解代碼混淆是如何工作的。代碼混淆工具仍然有很多變體，每種工具對代碼的混淆方式都不同。
#x02 JSFuck
我們可以嘗試在JSF中使用相同的工具來混淆代碼，然後重新運作它。我們會注意到，代碼可能需要一些時間才能運作，這表明代碼混淆如何影響性能，如前所述。
明文代碼：
console.log('Hello JavaScript Deobfuscation'); 混淆代碼：
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+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]+[+!+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]])[(![]+[])[!+[]+!+[]+!+[]]+(+(!+[]+!+[]+[+!+[]]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[+!+[]])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]]((!![]+[])[+[]])[([][(!![]+[])[!+[]+!+[]+!+[]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([![]]+[][[]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]](([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]][([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+!+[]]+(![]+[+[]])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+!+[]+[+[]]]+![]+(![]+[+[]])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+!+[]+[+[]]])()[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[+[]])[([![]]+[][[]])[+!+[]+[+[]]]+(!![]+[])[+[]]+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]]()[+!+[]+[+[]]])+[])[+!+[]])+([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]()[+!+[]+[!+[]+!+[]]])()) #x03JJ Encode
使用 jjencode 進行實際攻擊并不是一個好主意。它輕松解碼。jjencode 不是功利性的混淆，隻是一個編碼器。太有特色了。很容易被發現。取決于浏覽器。該代碼無法在某些類型的浏覽器上運作。
#x04AA Encode
aaencode - 将任何 JavaScript 程式編碼為日式表情符号 (^_^) 方式進行混淆，挺有意思的
明文代碼：
console.log('Hello JavaScript Deobfuscation'); 混淆代碼：
ﾟωﾟﾉ= /｀ｍ´）ﾉ ~┻━┻ //*´∇｀*/ ['_']; 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)+ (ﾟｰﾟ)+ (o^_^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)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ ((o^_^o) +(o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ (o^_^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)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟｰﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟｰﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+((ﾟｰﾟ) + (ﾟΘﾟ))+ ((o^_^o) +(o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟｰﾟ)+ (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)+ ((ﾟｰﾟ) + (o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+((ﾟｰﾟ) + (ﾟΘﾟ))+ (c^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟｰﾟ)+ ((ﾟｰﾟ) + (o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟΘﾟ)+ (c^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟｰﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟｰﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟｰﾟ)+ (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]+(ﾟｰﾟ)+ (c^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟΘﾟ)+ ((o^_^o) - (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)+ ((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) - (ﾟΘﾟ))+ (o^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟｰﾟ)+ (o^_^o)+ (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Θﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟΘﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ (c^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((o^_^o) +(o^_^o))+ (ﾟｰﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟｰﾟ)+ (c^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (c^_^o)+ (ﾟｰﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟｰﾟ)+ ((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) - (ﾟΘﾟ))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟｰﾟ)+ ((o^_^o) +(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Θﾟ)+ ((o^_^o) +(o^_^o))+ (o^_^o)+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ (ﾟｰﾟ)+ (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))+ (ﾟｰﾟ)+ (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))+ ((ﾟｰﾟ) + (o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟΘﾟ)+ ((ﾟｰﾟ) + (ﾟΘﾟ))+ ((o^_^o) +(o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+(ﾟｰﾟ)+ ((ﾟｰﾟ) + (o^_^o))+ (ﾟДﾟ)[ﾟεﾟ]+((ﾟｰﾟ) + (ﾟΘﾟ))+ (ﾟΘﾟ)+ (ﾟДﾟ)[ﾟεﾟ]+((ﾟｰﾟ) + (o^_^o))+ (o^_^o)+ (ﾟДﾟ)[ﾟoﾟ]) (ﾟΘﾟ)) ('_'); 然而，此類混淆器通常會使代碼執行/編譯速度非常慢，是以不建議使用它，除非有明顯的原因，例如繞過網絡過濾器或限制。
反混淆工具
現在我們了解了代碼混淆的工作原理，讓我們開始學習反混淆。正如有自動混淆代碼的工具一樣，也有自動美化和反混淆代碼的工具。
#x01 JSNice
我們可以找到許多優秀的線上工具來反混淆 JavaScript 代碼并将其轉換為我們可以了解的東西。JSNice是一個很好的工具。讓我們嘗試複制上面的混淆代碼并通過單擊Nicify JavaScript按鈕在 JSNice 中運作它。
示例
如之前代碼：
eval(function(p,a,c,k,e,d){e=function(c){return c};if(!''.replace(/^/,String)){while(c--){d[c]=k[c]||c}k=[function(e){return d[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}('0.1(\'2 3 4\');',5,5,'console|log|Hello|JavaScript|Deobfuscation'.split('|'),0,{})) 使用JSNice進行反混淆得到結果：
混淆注意事項
盡管到目前為止，這些工具在将代碼清理成我們可以了解的内容方面做得很好，但一旦代碼變得更加模糊和編碼，自動化工具清理它就會變得更加困難。如果使用自定義混淆工具對代碼進行混淆，則尤其如此。
我們需要手動對代碼進行逆向工程，以了解它是如何被混淆的以及它在這種情況下的功能。