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symbolicjs [2025/05/12 17:20] – Yukisymbolicjs [2025/05/12 21:22] (current) – Yuki
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-====== SymbolicJS: notes on JavaScipt obfuscation ======+====== SymbolicJS: notes on JavaScript obfuscation ======
  
 Inspired by JSFuck, but here's the rules: Inspired by JSFuck, but here's the rules:
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 <code javascript> <code javascript>
-[,$___,$_$$$,$$___,$$,$_$_,$_,____$,____]={}+[], +[,$___,$_$$$,$$___,$$,$_$_,$_,____$,____]={}+[], // o,b,j,e,c,t,space,O 
-[$$$_$,$$_,$$_$$,$$$$]=![]+[], +[$$$_$,$$_,$$_$$,$$$$]=![]+[], // f,a,l,s 
-[,$$_$,$$$_]=!``+[], +[,$$_$]=!``+[], // r 
-[__$]=-`!`+[], +[__$]=-`!`+[], // N 
-[,_$$,$_$,$$$_$,$$$,$_$,,,$_$__]=~[]/[]+[], +[,_$$,$_$,,$$$,,,,$_$__]=~[]/[]+[], // I,n,i,y 
-[$$$_,,$_$$]=[][[]]+[]+[$$$_,,$_$$]=[][[]]+[] // u,d
 </code> </code>
 +
 +Of course, a few of those are not needed, can be removed if you don't need them, and those identifiers can always be shorter. We need at least enough to spell ''constructor'' and ''return btoa''. Here's the minimum:
 +
 +<code javascript>
 +[,$___,$_$$$,,$$,$_$_$,$_,____$]={}+[], // o,b,e,c,t,space
 +[,$$_,,$$$$]=![]+[], // a,s
 +[,$$_$]=!``+[], // r
 +[$$$_,$_$]=[][[]]+[], // u,n
 +</code>
 +
 +<note>Note that we need the ''l'' for ''console.log'', and I'll put it back here, but it's shorter to move the ''i'' to the ''btoa'' call later in this document.</note>
  
 ===== Execute arbitrary code ===== ===== Execute arbitrary code =====
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 ===== Build more letters ===== ===== Build more letters =====
  
-We can then use `btoa` to get a lot of the letters we're missing:+We can then use `btoa` to get a lot of the letters we're missing, most notably ''h'' and ''i'' to spell ''return this'', and the ''g'' from ''log''.
  
 <code javascript> <code javascript>
-[K,C,g,h]=Function("return btoa`((!`")() // returns 'KCgh'+[K,i,g,h]=Function("return btoa")()`*(!` // returns 'Kigh'
 </code> </code>
  
 <code javascript> <code javascript>
-[,,$__$,$$$$$]=$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_$$$+$_+$___+$$_+`\`((!\``)()+[,$$$,$__$,$$$$$]=$((_=$$_$+$$+$_+$$$_+$$_$+$_$+____$)+$_$$$+$_+$___+$$_)()`*(!`
 </code> </code>
 +
 +<note>
 +It's useful to save ''"return "'' for later here. You might want to use another variable name, though.
 +</note>
  
 ===== Build the global object ===== ===== Build the global object =====
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 <code javascript> <code javascript>
-_=$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_+$$$$$+$$$+$$$$)()+_=$(_+$_+$$$$$+$$$+$$$$)()
 </code> </code>
  
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 </code> </code>
  
-===== Final result =====+===== console.log example ===== 
 + 
 +<code javascript> 
 +[,$___,$_$$$,,$$,$_$_$,$_,____$]={}+[], // o b e c t space 
 +[,$$_,$$_$$,$$$$]=![]+[], // a l s 
 +[,$$_$]=!``+[], // r 
 +[$$$_,$_$]=[][[]]+[], // u n 
 +$=(_=>_)[$_$_$+$___+$_$+$$$$+$_+$$_$+$$$_+$_$_$+$_+$___+$$_$], // $=Function 
 +[,$$$,$__$,$$$$$]=$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_$$$+$_+$___+$$_)()`*(!` // i g h 
 +$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_+$$$$$+$$$+$$$$)() // $("return this")() 
 +[$_$_$+$___+$_$+$$$$+$___+$$_$$+$$][$$_$$+$___+$__$]($$$$$+$$+$$_$$+$$_$$+$___) // console.log("hello") 
 +</code>
  
 <code javascript> <code javascript>
-[,$___,$_$$$,$$___,$$,$_$_$,$_,____$,____]={}+[],[$$$_$,$$_,$$_$$,$$$$]=![]+[],[,$$_$,$$$_]=!``+[],[__$]=-`!`+[],[,_$$,$_$,$$$_$,$$$,$_$,,,$_$__]=~[]/[]+[],[$$$_,,$_$$]=[][[]]+[],$=(_=>_)[$_$_$+$___+$_$+$$$$+$_+$$_$+$$$_+$_$_$+$_+$___+$$_$],[,,$__$,$$$$$]=$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_$$$+$_+$___+$$_+`\`((!\``)(),$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_+$$$$$+$$$+$$$$)()[$_$_$+$___+$_$+$$$$+$___+$$_$$+$$][$$_$$+$___+$__$]($$$$$+$$+$$_$$+$$_$$+$___)+[,$___,$_$$$,,$$,$_$_$,$_,____$]={}+[],[,$$_,$$_$$,$$$$]=![]+[],[,$$_$]=!``+[],[$$$_,$_$]=[][[]]+[],$=(_=>_)[$_$_$+$___+$_$+$$$$+$_+$$_$+$$$_+$_$_$+$_+$___+$$_$],[,$$$,$__$,$$$$$]=$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_$$$+$_+$___+$$_)()`*(!`,$($$_$+$$+$_+$$$_+$$_$+$_$+____$+$_+$$$$$+$$$+$$$$)()[$_$_$+$___+$_$+$$$$+$___+$$_$$+$$][$$_$$+$___+$__$]($$$$$+$$+$$_$$+$$_$$+$___)
 </code> </code>
symbolicjs.1747084811.txt.gz · Last modified: by Yuki

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