【misc】[SDCTF 2022]Flag Trafficker --jsFuck代码

博客介绍了从附件流量包中获取Flag的方法。先使用Wireshark打开流量包,搜索字符串“flag”得到JSFuck代码。可通过在线网站JSFuck - 在线加解密运行代码获取Flag,也可保存为HTML文件在浏览器运行,最终得到Flag为sdctf{G3T_F*cK3d_W1r3SHaRK}。

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附件下载下来是一个流量包,用wireshark打开该流量包,然后搜索字符串"flag",就会出现如下的jsfuck代码

右键onlick显示分组字节

可以看到很大一串的jsfuck代码,现在是需要运行这段代码,可利用在线网站运行:JSFuck - 在线加解密 (bugku.com),运行完就是flag

还可以保存为html文件在浏览器运行:
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html> <html> <body> <button type="button" onclick="[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]][([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+!+[]]+(+[![]]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]+(+(!+[]+!+[]+!+[]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[!+[]+!+[]])+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]])()([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]][([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+!+[]]+([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]()[+!+[]+[!+[]+!+[]]]+((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]+[+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+([][[]]+[])[!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]]+(![]+[])[+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[+!+[]]+[!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]]+([][[]]+[])[!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[+!+[]]+(!![]+[])[+!+[]]+[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]]+[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[+!+[]]+[+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]]+[!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[+!+[]]+[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]]+[!+[]+!+[]]+(!![]+[])[+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]+[+!+[]])[(![]+[])[!+[]+!+[]+!+[]]+(+(!+[]+!+[]+[+!+[]]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([]+[])[([][(!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to display the flag!</button> </body> </html> 

flag:sdctf{G3T_F*cK3d_W1r3SHaRK}

JSFuck 可以让你只用 6 个字符 []()! 来编写 JavaScript 程序。例如你想用 JSFuck 来实现 alert(1) 代码如下:[][(![] [])[ [[ []]]] ([][[]] [])[ [[! [] ! [] ! [] ! [] ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]][([][(![] [])[ [[ []]]] ([][[]] [])[ [[! [] ! [] ! [] ! [] ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]] [])[ [[! [] ! [] ! []]]] ([][(![] [])[ [[ []]]] ([][[]] [])[ [[! [] ! [] ! [] ! [] ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]] [])[ [[! [] ! [] ! [] ! [] ! [] ! []]]] ([][[]] [])[ [[ ! []]]] (![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[ ! []]]] ([][[]] [])[ [[ []]]] ([][(![] [])[ [[ []]]] ([][[]] [])[ [[! [] ! [] ! [] ! [] ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ []]]] ([][(![] [])[ [[ []]]] ([][[]] [])[ [[! [] ! [] ! [] ! [] ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]] [])[ [[! [] ! [] ! [] ! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]]((![] [])[ [[ ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]] (!![] [])[ [[ []]]] ([][(![] [])[ [[ []]]] ([][[]] [])[ [[! [] ! [] ! [] ! [] ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]] [])[ [[ ! []]] [[! [] ! [] ! [] ! [] ! []]]] [ ! []] ([][(![] [])[ [[ []]]] ([][[]] [])[ [[! [] ! [] ! [] ! [] ! []]]] (![] [])[ [[! [] ! []]]] (!![] [])[ [[ []]]] (!![] [])[ [[! [] ! [] ! []]]] (!![] [])[ [[ ! []]]]] [])[ [[ ! []]] [[! [] ! [] ! [] ! [] ! [] ! []]]])()其他一些基本的表达:false       =>  ![]true        =>  !![]undefined   =>  [][[]]NaN         =>   [![]]0           =>   []1           =>   ! []2           =>  ! [] ! []10          =>  [ ! []] [ []]Array       =>  []Number      =>   []String      =>  [] []Boolean     =>  ![]Function    =>  []["filter"]eval        =>  []["filter"]["constructor"]( CODE )()window      =>  []["filter"]["constructor"]("return this")() 标签:JSFuck
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