2020riftCTF

0x0 概述

近期在riftCTF上有一道逆向题，涉及到web前端反调试。题目如下

2020-03-23-15-00-16

0x1 开始

下载四个附件后，用游览器打开crackme.html

2020-03-23-15-04-35

输入字符串后会有两个结果 - 字符串与flag一致，提示correct password - 否则显示wrong password

除了crackme.js以外的文件，比较简单，没有一些相关信息，直接看crackme.js

大致源码分析了下，基本上比对flag的代码集中在crackme.js 核心代码在于

1
eval(atob("var _0x50fd=['0x2','exception','0x1','chain','log','indexOf','stateObject','activeElement','console','length','trace','keydown','constructor','\x5c+\x5c+\x20*(?:[a-zA-Z_$][0-9a-zA-Z_$]*)','gger','0xd','return\x20(function()\x20','input','counter','charCodeAt','debug','0xb','KDEgPDwgNykgLSAoMSA8PCAyKSArICggMSA8PCAwKQ==','fromCharCode','0x6','pow','getElementById','0x4','0x3','debu','text','function\x20*\x5c(\x20*\x5c)','0x7','0x16','Wrong\x20Password','0x13','test','0x17','call','0x19','apply','0x10','info','init','KCgoMSA8PCAyKSAqIDEwICsgOSkgLyAoKDEgPDwgMykgLSAxKSkgKiAoMSA8PCAxKQ==','0x12','table','event','Correct\x20Password','0x9','0x18','warn','0x11','0xf','action','innerHTML','0x8','string'];(function(_0x585798,_0x4dda76){var _0x13c1dc=function(_0x58c596){while(--_0x58c596){_0x585798['push'](_0x585798['shift']());}};_0x13c1dc(++_0x4dda76);}(_0x50fd,0xf3));var _0x1542=function(_0x585798,_0x4dda76){_0x585798=_0x585798-0x0;var _0x13c1dc=_0x50fd[_0x585798];return _0x13c1dc;};var _0x3d15=[_0x1542('0x30'),'table','keyCode',_0x1542('0x37'),'debug',_0x1542('0x17'),'trace',_0x1542('0x13'),'pow',_0x1542('0x36'),'info',_0x1542('0x38'),_0x1542('0x24'),'constructor',_0x1542('0x2e'),_0x1542('0xf'),'apply',_0x1542('0x6'),'error',_0x1542('0xb'),_0x1542('0x0'),'action',_0x1542('0x34'),_0x1542('0x2c'),'function\x20*\x5c(\x20*\x5c)',_0x1542('0x8')];(function(_0x1165cd,_0x2c16da){var _0x1e6421=function(_0x4efdfe){while(--_0x4efdfe){_0x1165cd['push'](_0x1165cd['shift']());}};_0x1e6421(++_0x2c16da);}(_0x3d15,0x14e));var _0x22fc=function(_0x2a1dd8,_0x5c0d8d){var _0x1f6a26=function(){var _0x3c7cd5=!![];return function(_0x33d66f,_0x526665){var _0x4a4a4f=_0x3c7cd5?function(){if(_0x526665){var _0x247e29=_0x526665['apply'](_0x33d66f,arguments);_0x526665=null;return _0x247e29;}}:function(){};_0x3c7cd5=![];return _0x4a4a4f;};}();var _0x2700f5=_0x1f6a26(this,function(){var _0x4c48b0=function(){};var _0x543c9b;try{var _0x2e2f79=Function(_0x1542('0x5')+'{}.constructor(\x22return\x20this\x22)(\x20)'+');');_0x543c9b=_0x2e2f79();}catch(_0x4e5dd4){_0x543c9b=window;}if(!_0x543c9b[_0x1542('0x37')]){_0x543c9b[_0x1542('0x37')]=function(_0x24110c){var _0x14888d={};_0x14888d[_0x1542('0x33')]=_0x24110c;_0x14888d['warn']=_0x24110c;_0x14888d['debug']=_0x24110c;_0x14888d[_0x1542('0x1f')]=_0x24110c;_0x14888d['error']=_0x24110c;_0x14888d['exception']=_0x24110c;_0x14888d[_0x1542('0x23')]=_0x24110c;_0x14888d[_0x1542('0x39')]=_0x24110c;return _0x14888d;}(_0x4c48b0);}else{_0x543c9b['console']['log']=_0x4c48b0;_0x543c9b[_0x1542('0x37')]['warn']=_0x4c48b0;_0x543c9b['console'][_0x1542('0x9')]=_0x4c48b0;_0x543c9b[_0x1542('0x37')]['info']=_0x4c48b0;_0x543c9b[_0x1542('0x37')]['error']=_0x4c48b0;_0x543c9b[_0x1542('0x37')][_0x1542('0x30')]=_0x4c48b0;_0x543c9b['console']['table']=_0x4c48b0;_0x543c9b[_0x1542('0x37')]['trace']=_0x4c48b0;}});_0x2700f5();_0x2a1dd8=_0x2a1dd8-0x0;var _0x4f20dc=_0x3d15[_0x2a1dd8];return _0x4f20dc;};var _0x4f9a80=function(){var _0x163c87=function(){var _0x4b34f8=!![];return function(_0x347478,_0x331dc1){var _0x257b87=_0x4b34f8?function(){if(_0x331dc1){var _0x1d1720=_0x331dc1['apply'](_0x347478,arguments);_0x331dc1=null;return _0x1d1720;}}:function(){};_0x4b34f8=![];return _0x257b87;};}();(function(){_0x163c87(this,function(){var _0x467e3f=new RegExp(_0x1542('0x14'));var _0x5cbdcb=new RegExp(_0x1542('0x2'),'i');var _0x3b800e=_0x3b24aa('init');if(!_0x467e3f[_0x1542('0x19')](_0x3b800e+_0x1542('0x32'))||!_0x5cbdcb[_0x1542('0x19')](_0x3b800e+_0x1542('0x6'))){_0x3b800e('0');}else{_0x3b24aa();}})();}());var _0x5755ef=!![];return function(_0x3d07df,_0xe6bddb){var _0x3502ad=_0x5755ef?function(){if(_0xe6bddb){var _0x376a3d=_0xe6bddb['apply'](_0x3d07df,arguments);_0xe6bddb=null;return _0x376a3d;}}:function(){};_0x5755ef=![];return _0x3502ad;};}();(function(){_0x4f9a80(this,function(){var _0x2c9069=new RegExp(_0x22fc(_0x1542('0x2f')));var _0xe04775=new RegExp(_0x1542('0x2'),'i');var _0x24b19d=_0x2182f0(_0x1542('0x20'));if(!_0x2c9069[_0x1542('0x19')](_0x24b19d+_0x1542('0x32'))||!_0xe04775[_0x1542('0x19')](_0x24b19d+_0x22fc('0x15'))){_0x24b19d('0');}else{_0x2182f0();}})();}());var _0x16fc41=function(){var _0x3cfe22=!![];return function(_0x1aa9d3,_0x2b4244){var _0x2a2201=_0x3cfe22?function(){if(_0x2b4244){var _0x3d9b48=_0x2b4244[_0x1542('0x1d')](_0x1aa9d3,arguments);_0x2b4244=null;return _0x3d9b48;}}:function(){};_0x3cfe22=![];return _0x2a2201;};}();var _0x2ce877=_0x16fc41(this,function(){var _0x5ff076=function(){};var _0xb542d9;try{var _0x5d8b77=Function(_0x1542('0x5')+'{}.constructor(\x22return\x20this\x22)(\x20)'+');');_0xb542d9=_0x5d8b77();}catch(_0x20c98f){_0xb542d9=window;}if(!_0xb542d9[_0x1542('0x37')]){_0xb542d9[_0x22fc(_0x1542('0x15'))]=function(_0x1186c5){var _0x4ad6d4={};_0x4ad6d4['log']=_0x1186c5;_0x4ad6d4['warn']=_0x1186c5;_0x4ad6d4[_0x22fc(_0x1542('0x2d'))]=_0x1186c5;_0x4ad6d4[_0x22fc('0xe')]=_0x1186c5;_0x4ad6d4[_0x22fc('0x16')]=_0x1186c5;_0x4ad6d4[_0x22fc(_0x1542('0x10'))]=_0x1186c5;_0x4ad6d4['table']=_0x1186c5;_0x4ad6d4[_0x22fc('0xa')]=_0x1186c5;return _0x4ad6d4;}(_0x5ff076);}else{_0xb542d9['console']['log']=_0x5ff076;_0xb542d9['console'][_0x1542('0x28')]=_0x5ff076;_0xb542d9[_0x1542('0x37')][_0x22fc(_0x1542('0x2d'))]=_0x5ff076;_0xb542d9['console']['info']=_0x5ff076;_0xb542d9[_0x22fc(_0x1542('0x15'))][_0x22fc(_0x1542('0x16'))]=_0x5ff076;_0xb542d9[_0x1542('0x37')]['exception']=_0x5ff076;_0xb542d9['console'][_0x22fc('0x5')]=_0x5ff076;_0xb542d9[_0x1542('0x37')]['trace']=_0x5ff076;}});_0x2ce877();window['addEventListener'](_0x22fc(_0x1542('0x27')),function(_0x1936b6){a=document[_0x1542('0xf')](_0x22fc('0x15'));if(_0x1936b6[_0x22fc(_0x1542('0xd'))]===0x8&&document[_0x22fc(_0x1542('0x4'))]!==_0x22fc(_0x1542('0xa'))){a['innerHTML']=a[_0x22fc(_0x1542('0x31'))]['substring'](0x0,a[_0x1542('0x2c')]['length']-0x1);return;}});setInterval(function(){_0x2182f0();},0xfa0);var validKey=function(_0x35e690){if(_0x35e690>=0x21&&_0x35e690<=0x7d){return!![];}else{return![];}};document['onkeypress']=function(_0xa4c768){_0xa4c768=_0xa4c768||window[_0x22fc(_0x1542('0x1e'))];a=document[_0x22fc(_0x1542('0x18'))](_0x22fc('0x15'));if(_0xa4c768[_0x22fc(_0x1542('0xd'))]==0xd){if(check(a[_0x1542('0x2c')])){a[_0x1542('0x2c')]='Correct\x20Password';}else{a['innerHTML']=_0x22fc(_0x1542('0x26'));}return;}if(a[_0x22fc('0x1')]==_0x1542('0x25')||a['innerHTML']==_0x22fc('0x9')||a[_0x1542('0x2c')]=='Enter\x20Password\x20...'){if(validKey(_0xa4c768['keyCode'])){a[_0x22fc('0x1')]=String[_0x1542('0xc')](_0xa4c768['keyCode']);return;}}if(validKey(_0xa4c768['keyCode'])){a[_0x22fc('0x1')]=a[_0x22fc(_0x1542('0x31'))]+String[_0x1542('0xc')](_0xa4c768[_0x22fc(_0x1542('0xd'))]);return;}};var check=function(_0x4825a8){var _0x873b25=_0x1542('0x21');if(_0x4825a8[_0x22fc('0x0')]('_')!=eval(atob(_0x873b25))){return![];}if(_0x4825a8[0x24][_0x22fc(_0x1542('0x11'))]()%0x5!=0x0&&_0x4825a8[0x24]['charCodeAt']()-_0x4825a8[0x7][_0x1542('0x8')]()!=0x2||_0x4825a8[0x24][_0x22fc('0x3')]()!=eval(atob(_0x22fc(_0x1542('0x1a'))))){return![];}if(_0x4825a8[0x8]==_0x4825a8[0x23]){if(_0x4825a8[0x9]!=_0x4825a8[0x22]){return![];}if(_0x4825a8[0x9]!='-'){return![];}if(_0x4825a8[0x22]!=_0x4825a8[0x23]){return![];}var _0x873b25=_0x4825a8[0x22]['charCodeAt']();if(_0x873b25%0x9!=0x0){return![];}if(_0x873b25%0x5!=0x0){return![];}if(_0x873b25%0x28!=0x5){return![];}}else{return![];}if(_0x4825a8[0xa]){_0x873b25=_0x4825a8[0xa]['charCodeAt']();if(_0x873b25-_0x4825a8[0x8][_0x1542('0x8')]()*0x3+0xe!=0x0){return![];}}if(Math[_0x22fc('0xc')](_0x4825a8[0xb][_0x1542('0x8')]()-0x30,0x4)!=0x0){return![];}if(_0x4825a8[0xc]!='u'&&_0x4825a8[0x15]!='w'){return![];}if(_0x4825a8[0xd]['charCodeAt']()%0x6==0x0){var _0x1ed1fd=[0x1];for(var _0x873b25=0x1;_0x873b25<0x5;_0x873b25++){var _0x476c4e=0x1;for(var _0x5a996c=0x1;_0x5a996c<=_0x873b25;_0x5a996c++){_0x476c4e=_0x476c4e*Math[_0x22fc('0xc')](_0x5a996c,_0x5a996c);}_0x1ed1fd[_0x873b25]=_0x476c4e;}if(_0x1ed1fd[0x0]+_0x1ed1fd[0x1]+_0x1ed1fd[0x2]+_0x1ed1fd[0x3]!=_0x4825a8[0xd]['charCodeAt']()){return![];}}else{return![];}if((_0x4825a8[0xe][_0x1542('0x8')]()^_0x4825a8[0x14][_0x22fc(_0x1542('0x11'))]()^_0x4825a8[0x18][_0x22fc(_0x1542('0x11'))]()^_0x4825a8[0x1f][_0x22fc('0x3')]())!=0x0||_0x4825a8[0x18][_0x22fc('0x3')]()!=_0x4825a8[0x1a][_0x22fc('0x3')]()-((0x1<<0x4)+(0x1<<0x2)-0x1)){return![];}if(_0x4825a8[0xf]!='f'||_0x4825a8[0x10][_0x22fc(_0x1542('0x11'))]()-0x30!=0x1){return![];}if(_0x4825a8[0x11][_0x22fc('0x3')]()%0x6==0x0){var _0x1ed1fd=[0x1];for(var _0x873b25=0x1;_0x873b25<0x5;_0x873b25++){var _0x476c4e=0x1;for(var _0x5a996c=0x1;_0x5a996c<=_0x873b25;_0x5a996c++){_0x476c4e=_0x476c4e*Math[_0x1542('0xe')](_0x5a996c,_0x5a996c);}_0x1ed1fd[_0x873b25]=_0x476c4e;}if(_0x1ed1fd[0x0]+_0x1ed1fd[0x1]+_0x1ed1fd[0x2]+_0x1ed1fd[0x3]!=_0x4825a8[0x11]['charCodeAt']()){return![];}}else{return![];}if(_0x4825a8[0x11]['charCodeAt']()+0x1!=_0x4825a8[0x12][_0x22fc(_0x1542('0x11'))]()){return![];}if(_0x4825a8[0x11][_0x1542('0x8')]()+0x2!=_0x4825a8[0x13][_0x1542('0x8')]()){return![];}if(_0x4825a8[0x15]!='w'||_0x4825a8[0x16][_0x1542('0x8')]()-0x30!=0x3){return![];}if(_0x4825a8[0x17]!='b'||_0x4825a8[0x19]!='c'){return![];}if(_0x4825a8[0x1a][_0x22fc(_0x1542('0x11'))]()%0x6==0x0){var _0x1ed1fd=[0x1];for(var _0x873b25=0x1;_0x873b25<0x5;_0x873b25++){var _0x476c4e=0x1;for(var _0x5a996c=0x1;_0x5a996c<=_0x873b25;_0x5a996c++){_0x476c4e=_0x476c4e*Math[_0x1542('0xe')](_0x5a996c,_0x5a996c);}_0x1ed1fd[_0x873b25]=_0x476c4e;}if(_0x1ed1fd[0x0]+_0x1ed1fd[0x1]+_0x1ed1fd[0x2]+_0x1ed1fd[0x3]!=_0x4825a8[0x1a]['charCodeAt']()){return![];}}else{return![];}if(_0x4825a8[0x1b][_0x22fc(_0x1542('0x11'))]()-0x30!=0x4){return![];}if((_0x4825a8[0x1c]['charCodeAt']()^0x20)!='K'['charCodeAt']()){return![];}if(_0x4825a8[0x1d]!='m'||_0x4825a8[0x1e]!='e'||_0x4825a8[0x20]!='X'||_0x4825a8[0x21]!='O'){return![];}if(_0x4825a8[0x0]!='r'&&_0x4825a8[0x1]!='i'&&_0x4825a8[0x2]!='f'&&_0x4825a8[0x3]!='t'&&_0x4825a8[0x4]!='C'&&_0x4825a8[0x5]!='T'&&_0x4825a8[0x6]!='F'){return![];}return!![];};function _0x2182f0(_0x23437a){function _0x150826(_0x3db91b){if(typeof _0x3db91b===_0x22fc(_0x1542('0x22'))){return function(_0x20a22a){}[_0x22fc(_0x1542('0x29'))]('while\x20(true)\x20{}')[_0x22fc('0x14')](_0x1542('0x7'));}else{if((''+_0x3db91b/_0x3db91b)[_0x22fc(_0x1542('0x2a'))]!==0x1||_0x3db91b%0x14===0x0){(function(){return!![];}[_0x1542('0x1')](_0x1542('0x12')+'gger')['call'](_0x22fc(_0x1542('0x1c'))));}else{(function(){return![];}[_0x22fc('0x11')]('debu'+_0x1542('0x3'))[_0x1542('0x1d')](_0x1542('0x35')));}}_0x150826(++_0x3db91b);}try{if(_0x23437a){return _0x150826;}else{_0x150826(0x0);}}catch(_0x3fa4b3){}}setInterval(function(){_0x3b24aa();},0xfa0);function _0x3b24aa(_0x3bac56){function _0x1dde7b(_0x1904bd){if(typeof _0x1904bd===_0x1542('0x2e')){return function(_0x200399){}['constructor']('while\x20(true)\x20{}')['apply'](_0x1542('0x7'));}else{if((''+_0x1904bd/_0x1904bd)[_0x1542('0x38')]!==0x1||_0x1904bd%0x14===0x0){(function(){return!![];}['constructor'](_0x1542('0x12')+'gger')[_0x1542('0x1b')](_0x1542('0x2b')));}else{(function(){return![];}['constructor'](_0x1542('0x12')+_0x1542('0x3'))['apply']('stateObject'));}}_0x1dde7b(++_0x1904bd);}try{if(_0x3bac56){return _0x1dde7b;}else{_0x1dde7b(0x0);}}catch(_0x591427){}}"))

通过base64解码，将引号内容还原成可阅读的代码文件

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
var _0x50fd = ['0x2', 'exception', '0x1', 'chain', 'log', 'indexOf', 'stateObject', 'activeElement', 'console', 'length', 'trace', 'keydown', 'constructor', '\x5c+\x5c+\x20*(?:[a-zA-Z_$][0-9a-zA-Z_$]*)', 'gger', '0xd', 'return\x20(function()\x20', 'input', 'counter', 'charCodeAt', 'debug', '0xb', 'KDEgPDwgNykgLSAoMSA8PCAyKSArICggMSA8PCAwKQ==', 'fromCharCode', '0x6', 'pow', 'getElementById', '0x4', '0x3', 'debu', 'text', 'function\x20*\x5c(\x20*\x5c)', '0x7', '0x16', 'Wrong\x20Password', '0x13', 'test', '0x17', 'call', '0x19', 'apply', '0x10', 'info', 'init', 'KCgoMSA8PCAyKSAqIDEwICsgOSkgLyAoKDEgPDwgMykgLSAxKSkgKiAoMSA8PCAxKQ==', '0x12', 'table', 'event', 'Correct\x20Password', '0x9', '0x18', 'warn', '0x11', '0xf', 'action', 'innerHTML', '0x8', 'string'];
(function (_0x585798, _0x4dda76) {
    var _0x13c1dc = function (_0x58c596) {
        while (--_0x58c596) {
            _0x585798['push'](_0x585798['shift']());
        }
    };
    _0x13c1dc(++_0x4dda76);
}(_0x50fd, 0xf3));
var check = function (_0x4825a8) {...
};
...缩略

主要password比对的操作集中在check函数。

0x2 解题思路

静态分析静态分析是一种方式，但对于新手来说，有一部分参数和字段的转化需要花很长时间来理清

后续

可以考虑能否简化过程

动态分析 F12打开开发者工具，web直接中断，无法调试。

查阅了相关资料，发现前端有反调试机制，使得我们无法通过下断，单步步进，对程序就行调试。我们需要绕过这部分代码。

动静结合因为程序代码所有的工作空间都在一起，所以可用通过console打印结合静态分析，解读代码获取正确的password

0x3 解题过程

将我们解码的文件覆盖原有的crackme.js

动静结合刷新页面，F12进入开发者工具。在console里输入check(‘123456789’),可以看到虽然程序处于暂停状态，实际内部代码我们是可以调用的。

2020-03-23-15-26-46

开始对check函数逐行就行分析，可以看到，如果我们进入任意带return ![]的if语句中，check函数返回的都是false，所以我们要让函数中这样的的if条件均为false

2020-03-23-15-28-33

举例说明

1
2
3
4
5
 if (_0x4825a8[0x24][_0x22fc(_0x1542('0x11'))]() % 0x5 != 0x0 
 && _0x4825a8[0x24]['charCodeAt']() - _0x4825a8[0x7][_0x1542('0x8')]() != 0x2 
 || _0x4825a8[0x24][_0x22fc('0x3')]() != eval(atob(_0x22fc(_0x1542('0x1a'))))) {
        return ![];
    }

我们可以将一些内容用console打印出来，例如

2020-03-23-15-34-08

所以上面的if语句可以简化为

1
2
3
4
if(_0x4825a8[36].charCodeAt()%5!=0&&_0x4825a8[36].charCodeAt()-_0x4825a8[7].charCodeAt()!=2||_0x4825a8[36].charCodeAt()!=125 )
{
    return false;
}

由此可见，_0x4825a8[36]=125 ，_0x4825a8[7]=123

依次完成check函数的混淆还原成简化的函数如下：

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
var check = function (flag) {
    var _0x873b25 = "KCgoMSA8PCAyKSAqIDEwICsgOSkgLyAoKDEgPDwgMykgLSAxKSkgKiAoMSA8PCAxKQ==";
    if (flag.indexOf('_') !=14) {
        return false;
    }
    if (flag[36].charCodeAt() % 5 != 0 && flag[36].charCodeAt() - flag[7].charCodeAt() != 2 || flag[36].charCodeAt() != 125) {
        return false;
    }
    if (flag[8] == flag[35]) {
        if (flag[9] != flag[34]) {
            return false;
        }
        if (flag[9] != '-') {
            return false;
        }
        if (flag[34] != flag[35]) {
            return false;
        }
        var _0x873b25 = flag[34].charCodeAt();
        if (_0x873b25 % 9 != 0) {
            return false;
        }
        if (_0x873b25 % 5 != 0) {
            return false;
        }
        if (_0x873b25 % 40 != 5) {
            return false;
        }
    } else {
        return false;
    }
    if (flag[10]) {
        _0x873b25 = flag[10].charCodeAt();
        if (_0x873b25 - flag[8].charCodeAt() * 3 + 14 != 0) {
            return false;
        }
    }
    if (Math.pow(flag[11].charCodeAt() - 48, 4) != 0) {
        return false;
    }
    if (flag[12] != 'u' && flag[21] != 'w') {
        return false;
    }
    if (flag[13].charCodeAt() % 6 == 0) {
        var _0x1ed1fd = [1];
        for (var i = 1; i < 5; i++) {
            var _0x476c4e = 1;
            for (var j = 1; j <= i; j++) {
                _0x476c4e = _0x476c4e * Math.pow(j, j);
            }
            _0x1ed1fd[i] = _0x476c4e;
        }
        if (_0x1ed1fd[0] + _0x1ed1fd[1] + _0x1ed1fd[2] + _0x1ed1fd[3] != flag[13].charCodeAt()) {
            return false;
        }
    } else {
        return false;
    }
    if ((flag[14].charCodeAt() ^ flag[20].charCodeAt() ^ flag[24].charCodeAt() ^ flag[31].charCodeAt()) != 0 || flag[24].charCodeAt() != flag[26].charCodeAt() - 19) {
        return false;
    }
    if (flag[15] != 'f' || flag[16].charCodeAt() - 48 != 1) {
        return false;
    }
    if (flag[17].charCodeAt() % 6 == 0) {
        var _0x1ed1fd = [1];
        for (var i = 1; i < 5; i++) {
            var _0x476c4e = 1;
            for (var j = 1; j <= i; j++) {
                _0x476c4e = _0x476c4e * Math.pow(j, j);
            }
            _0x1ed1fd[i] = _0x476c4e;
        }
        if (_0x1ed1fd[0] + _0x1ed1fd[1] + _0x1ed1fd[2] + _0x1ed1fd[3] != flag[17].charCodeAt()) {
            return false;
        }
    } else {
        return false;
    }
    if (flag[17].charCodeAt() + 0x1 != flag[18].charCodeAt()) {
        return false;
    }
    if (flag[17].charCodeAt() + 0x2 != flag[19].charCodeAt()) {
        return false;
    }
    if (flag[21] != 'w' || flag[22].charCodeAt() - 48 != 3) {
        return false;
    }
    if (flag[23] != 'b' || flag[25] != 'c') {
        return false;
    }
    if (flag[26].charCodeAt() % 0x6 == 0x0) {
        var _0x1ed1fd = [1];
        for (var i = 1; i < 5; i++) {
            var _0x476c4e = 1;
            for (var j = 1; j <= i; j++) {
                _0x476c4e = _0x476c4e * Math.pow(j, j);
            }
            _0x1ed1fd[i] = _0x476c4e;
        }
        if (_0x1ed1fd[0] + _0x1ed1fd[1] + _0x1ed1fd[2] + _0x1ed1fd[3] != flag[26].charCodeAt()) {
            return false;
        }
    } else {
        return false;
    }
    if (flag[27].charCodeAt() - 48 != 4) {
        return false;
    }
    if ((flag[29].charCodeAt() ^ 32) != 'K' .charCodeAt()) {
        return false;
    }
    if (flag[29] != 'm' || flag[30] != 'e' || flag[32] != 'X' || flag[33] != 'O') {
        return false;
    }
    if (flag[0] != 'r' && flag[1] != 'i' && flag[2] != 'f' && flag[3] != 't' && flag[4] != 'C' && flag[5] != 'T' && flag[6] != 'F') {
        return false;
    }
    return true;
};

反反调试

查阅了一些资料，前端反调试其实挺简单的。就是在代码中插入一些debugable，需要将这些标记删除即可。大致游览了下，整体代码中有多处出现debugable相关代码比如 2020-03-23-15-42-09 直接将类似的函数删除之后，就能去除反调试限制。 2020-03-23-15-46-38

如何确认是否可删除，是否会影响程序运行，需要逐步测试。

剔除debugable后的代码

var _0x50fd = ['0x2', 'exception', '0x1', 'chain', 'log', 'indexOf', 'stateObject', 'activeElement', 'console', 'length', 'trace', 'keydown', 'constructor', '\x5c+\x5c+\x20*(?:[a-zA-Z_$][0-9a-zA-Z_$]*)', 'gger', '0xd', 'return\x20(function()\x20', 'input', 'counter', 'charCodeAt', 'debug', '0xb', 'KDEgPDwgNykgLSAoMSA8PCAyKSArICggMSA8PCAwKQ==', 'fromCharCode', '0x6', 'pow', 'getElementById', '0x4', '0x3', 'debu', 'text', 'function\x20*\x5c(\x20*\x5c)', '0x7', '0x16', 'Wrong\x20Password', '0x13', 'test', '0x17', 'call', '0x19', 'apply', '0x10', 'info', 'init', 'KCgoMSA8PCAyKSAqIDEwICsgOSkgLyAoKDEgPDwgMykgLSAxKSkgKiAoMSA8PCAxKQ==', '0x12', 'table', 'event', 'Correct\x20Password', '0x9', '0x18', 'warn', '0x11', '0xf', 'action', 'innerHTML', '0x8', 'string'];
(function (_0x585798, _0x4dda76) {
    var _0x13c1dc = function (_0x58c596) {
        while (--_0x58c596) {
            _0x585798['push'](_0x585798['shift']());
        }
    };
    _0x13c1dc(++_0x4dda76);
}(_0x50fd, 0xf3));
var _0x1542 = function (_0x585798, _0x4dda76) {
    _0x585798 = _0x585798 - 0x0;
    var _0x13c1dc = _0x50fd[_0x585798];
    return _0x13c1dc;
};
var _0x3d15 = [_0x1542('0x30'), 'table', 'keyCode', _0x1542('0x37'), 'debug', _0x1542('0x17'), 'trace', _0x1542('0x13'), 'pow', _0x1542('0x36'), 'info', _0x1542('0x38'), _0x1542('0x24'), 'constructor', _0x1542('0x2e'), _0x1542('0xf'), 'apply', _0x1542('0x6'), 'error', _0x1542('0xb'), _0x1542('0x0'), 'action', _0x1542('0x34'), _0x1542('0x2c'), 'function\x20*\x5c(\x20*\x5c)', _0x1542('0x8')];
(function (_0x1165cd, _0x2c16da) {
    var _0x1e6421 = function (_0x4efdfe) {
        while (--_0x4efdfe) {
            _0x1165cd['push'](_0x1165cd['shift']());
        }
    };
    _0x1e6421(++_0x2c16da);
}(_0x3d15, 0x14e));
var _0x22fc = function (_0x2a1dd8, _0x5c0d8d) {
    var _0x1f6a26 = function () {
        var _0x3c7cd5 = !![];
        return function (_0x33d66f, _0x526665) {
            var _0x4a4a4f = _0x3c7cd5 ? function () {
                if (_0x526665) {
                    var _0x247e29 = _0x526665['apply'](_0x33d66f, arguments);
                    _0x526665 = null;
                    return _0x247e29;
                }
            } : function () {};
            _0x3c7cd5 = ![];
            return _0x4a4a4f;
        };
    }();
        _0x2a1dd8 = _0x2a1dd8 - 0x0;
    var _0x4f20dc = _0x3d15[_0x2a1dd8];
    return _0x4f20dc;
};
var _0x4f9a80 = function () {
    var _0x163c87 = function () {
        var _0x4b34f8 = !![];
        return function (_0x347478, _0x331dc1) {
            var _0x257b87 = _0x4b34f8 ? function () {
                if (_0x331dc1) {
                    var _0x1d1720 = _0x331dc1['apply'](_0x347478, arguments);
                    _0x331dc1 = null;
                    return _0x1d1720;
                }
            } : function () {};
            _0x4b34f8 = ![];
            return _0x257b87;
        };
    }();
    (function () {
        _0x163c87(this, function () {
            var _0x467e3f = new RegExp(_0x1542('0x14'));
            var _0x5cbdcb = new RegExp(_0x1542('0x2'), 'i');
            })();
    }());
    var _0x5755ef = !![];
    return function (_0x3d07df, _0xe6bddb) {
        var _0x3502ad = _0x5755ef ? function () {
            if (_0xe6bddb) {
                var _0x376a3d = _0xe6bddb['apply'](_0x3d07df, arguments);
                _0xe6bddb = null;
                return _0x376a3d;
            }
        } : function () {};
        _0x5755ef = ![];
        return _0x3502ad;
    };
}();
(function () {
    _0x4f9a80(this, function () {
        var _0x2c9069 = new RegExp(_0x22fc(_0x1542('0x2f')));
        var _0xe04775 = new RegExp(_0x1542('0x2'), 'i');
    })();
}());
var _0x16fc41 = function () {
    var _0x3cfe22 = !![];
    return function (_0x1aa9d3, _0x2b4244) {
        var _0x2a2201 = _0x3cfe22 ? function () {
            if (_0x2b4244) {
                var _0x3d9b48 = _0x2b4244[_0x1542('0x1d')](_0x1aa9d3, arguments);
                _0x2b4244 = null;
                return _0x3d9b48;
            }
        } : function () {};
        _0x3cfe22 = ![];
        return _0x2a2201;
    };
}();
window['addEventListener'](_0x22fc(_0x1542('0x27')), function (_0x1936b6) {
a = document[_0x1542('0xf')](_0x22fc('0x15'));
if (_0x1936b6[_0x22fc(_0x1542('0xd'))] === 0x8 && document[_0x22fc(_0x1542('0x4'))] !== _0x22fc(_0x1542('0xa'))) {
a['innerHTML'] = a[_0x22fc(_0x1542('0x31'))]['substring'](0x0, a[_0x1542('0x2c')]['length'] - 0x1);
return;
}
});
var validKey = function (_0x35e690) {
if (_0x35e690 >= 0x21 && _0x35e690 <= 0x7d) {
return !![];
} else {
return ![];
}
};
document['onkeypress'] = function (_0xa4c768) {
_0xa4c768 = _0xa4c768 || window[_0x22fc(_0x1542('0x1e'))];
a = document[_0x22fc(_0x1542('0x18'))](_0x22fc('0x15'));
if (_0xa4c768[_0x22fc(_0x1542('0xd'))] == 0xd) {
if (check(a[_0x1542('0x2c')])) {
a[_0x1542('0x2c')] = 'Correct\x20Password';
} else {
a['innerHTML'] = _0x22fc(_0x1542('0x26'));
}
return;
}
if (a[_0x22fc('0x1')] == _0x1542('0x25') || a['innerHTML'] == _0x22fc('0x9') || a[_0x1542('0x2c')] == 'Enter\x20Password\x20…') {
if (validKey(_0xa4c768['keyCode'])) {
a[_0x22fc('0x1')] = String[_0x1542('0xc')](_0xa4c768['keyCode']);
return;
}
}
if (validKey(_0xa4c768['keyCode'])) {
a[_0x22fc('0x1')] = a[_0x22fc(_0x1542('0x31'))] + String[_0x1542('0xc')](_0xa4c768[_0x22fc(_0x1542('0xd'))]);
return;
}
};
var check = function (_0x4825a8) {
var _0x873b25 = _0x1542('0x21');
if (_0x4825a8[0x22fc('0x0')]('') != eval(atob(_0x873b25))) {
return ![];
}
if (_0x4825a8[0x24]_0x22fc(_0x1542('0x11')) % 0x5 != 0x0 && _0x4825a8[0x24]'charCodeAt' - _0x4825a8[0x7]_0x1542('0x8') != 0x2 || _0x4825a8[0x24]_0x22fc('0x3') != eval(atob(_0x22fc(_0x1542('0x1a'))))) {
return ![];
}
if (_0x4825a8[0x8] == _0x4825a8[0x23]) {
if (_0x4825a8[0x9] != _0x4825a8[0x22]) {
return ![];
}
if (_0x4825a8[0x9] != '-') {
return ![];
}
if (_0x4825a8[0x22] != _0x4825a8[0x23]) {
return ![];
}
var _0x873b25 = _0x4825a8[0x22]'charCodeAt';
if (_0x873b25 % 0x9 != 0x0) {
return ![];
}
if (_0x873b25 % 0x5 != 0x0) {
return ![];
}
if (_0x873b25 % 0x28 != 0x5) {
return ![];
}
} else {
return ![];
}
if (_0x4825a8[0xa]) {
_0x873b25 = _0x4825a8[0xa]'charCodeAt';
if (_0x873b25 - _0x4825a8[0x8]_0x1542('0x8')  0x3 + 0xe != 0x0) {
return ![];
}
}
if (Math[_0x22fc('0xc')](_0x4825a8[0xb]_0x1542('0x8') - 0x30, 0x4) != 0x0) {
return ![];
}
if (_0x4825a8[0xc] != 'u' && _0x4825a8[0x15] != 'w') {
return ![];
}
if (_0x4825a8[0xd]'charCodeAt' % 0x6 == 0x0) {
var _0x1ed1fd = [0x1];
for (var _0x873b25 = 0x1; _0x873b25 < 0x5; _0x873b25++) {
var _0x476c4e = 0x1;
for (var _0x5a996c = 0x1; _0x5a996c <= _0x873b25; _0x5a996c++) {
_0x476c4e = _0x476c4e  Math[_0x22fc('0xc')](_0x5a996c, _0x5a996c);
}
_0x1ed1fd[_0x873b25] = _0x476c4e;
}
if (_0x1ed1fd[0x0] + _0x1ed1fd[0x1] + _0x1ed1fd[0x2] + _0x1ed1fd[0x3] != _0x4825a8[0xd]'charCodeAt') {
return ![];
}
} else {
return ![];
}
if ((_0x4825a8[0xe]_0x1542('0x8') ^ _0x4825a8[0x14]_0x22fc(_0x1542('0x11')) ^ _0x4825a8[0x18]_0x22fc(_0x1542('0x11')) ^ _0x4825a8[0x1f]_0x22fc('0x3')) != 0x0 || _0x4825a8[0x18]_0x22fc('0x3') != _0x4825a8[0x1a]_0x22fc('0x3') - ((0x1 << 0x4) + (0x1 << 0x2) - 0x1)) {
return ![];
}
if (_0x4825a8[0xf] != 'f' || _0x4825a8[0x10]_0x22fc(_0x1542('0x11')) - 0x30 != 0x1) {
return ![];
}
if (_0x4825a8[0x11]_0x22fc('0x3') % 0x6 == 0x0) {
var _0x1ed1fd = [0x1];
for (var _0x873b25 = 0x1; _0x873b25 < 0x5; _0x873b25++) {
var _0x476c4e = 0x1;
for (var _0x5a996c = 0x1; _0x5a996c <= _0x873b25; _0x5a996c++) {
_0x476c4e = _0x476c4e  Math[_0x1542('0xe')](_0x5a996c, _0x5a996c);
}
_0x1ed1fd[_0x873b25] = _0x476c4e;
}
if (_0x1ed1fd[0x0] + _0x1ed1fd[0x1] + _0x1ed1fd[0x2] + _0x1ed1fd[0x3] != _0x4825a8[0x11]'charCodeAt') {
return ![];
}
} else {
return ![];
}
if (_0x4825a8[0x11]'charCodeAt' + 0x1 != _0x4825a8[0x12]_0x22fc(_0x1542('0x11'))) {
return ![];
}
if (_0x4825a8[0x11]_0x1542('0x8') + 0x2 != _0x4825a8[0x13]_0x1542('0x8')) {
return ![];
}
if (_0x4825a8[0x15] != 'w' || _0x4825a8[0x16]_0x1542('0x8') - 0x30 != 0x3) {
return ![];
}
if (_0x4825a8[0x17] != 'b' || _0x4825a8[0x19] != 'c') {
return ![];
}
if (_0x4825a8[0x1a]_0x22fc(_0x1542('0x11')) % 0x6 == 0x0) {
var _0x1ed1fd = [0x1];
for (var _0x873b25 = 0x1; _0x873b25 < 0x5; _0x873b25++) {
var _0x476c4e = 0x1;
for (var _0x5a996c = 0x1; _0x5a996c <= _0x873b25; _0x5a996c++) {
_0x476c4e = _0x476c4e  Math[_0x1542('0xe')](_0x5a996c, _0x5a996c);
}
_0x1ed1fd[_0x873b25] = _0x476c4e;
}
if (_0x1ed1fd[0x0] + _0x1ed1fd[0x1] + _0x1ed1fd[0x2] + _0x1ed1fd[0x3] != _0x4825a8[0x1a]'charCodeAt') {
return ![];
}
} else {
return ![];
}
if (_0x4825a8[0x1b]_0x22fc(_0x1542('0x11')) - 0x30 != 0x4) {
return ![];
}
if ((_0x4825a8[0x1c]'charCodeAt' ^ 0x20) != 'K' 'charCodeAt') {
return ![];
}
if (_0x4825a8[0x1d] != 'm' || _0x4825a8[0x1e] != 'e' || _0x4825a8[0x20] != 'X' || _0x4825a8[0x21] != 'O') {
return ![];
}
if (_0x4825a8[0x0] != 'r' && _0x4825a8[0x1] != 'i' && _0x4825a8[0x2] != 'f' && _0x4825a8[0x3] != 't' && _0x4825a8[0x4] != 'C' && _0x4825a8[0x5] != 'T' && _0x4825a8[0x6] != 'F') {
return ![];
}
return !![];
};

通过以上方法，最终获得flag

flag

riftCTF{–y0ur_f1rst_w3b_cr4kme_XO–}

Contents

0x0 概述

0x1 开始

0x2 解题思路

0x3 解题过程