문제를 들어가면 debug me가 나옵니다.
시작부터 alert 메시지가 뜨니 신이 납니다....
js-7인 걸로 보아 소스코드 보기를 해보도록 합시다.
문제 파일 이쁘게 만들기 전~
<html>
<head>
<title>Challenge 34</title>
<script>
var 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</script>
</head>
<body bgcolor="black">
문제 파일 이쁘게 만들기 후~
<html>
<head>
<title>Challenge 34</title>
<script>
var a = ['RcOhTDV1Ew==', 'McOVwqpRBg==', 'c8K/w43DvcK8', 'SsOrTCF1CVDCgcKLEsKc', 'NsK/w4Bc', 'G1TDpwk=', 'AcKtwqfDlW7Dsw==', 'e3kkcQJfwoNFDEU9', 'QMOXDBo=', 'w5bCsWlh', 'eWY6bg8=', 'FnbDoEvDtl1LUkB7w4Q=', 'esOZTiPDsg==', 'bzfCkFfCtA==', 'ZmzDjHcn', 'PxLCm3LDvA==', 'IcKlVy9pw57DgMK3w6kmwpvCiUnDhcOKw4A=', 'LMKnwqECawEeEMOZQsK7wrLCscKpSG1AwqvDvjnDpMKhOSDCqQfDmVRowo1nwpzCh8OGc1vDv3cKVR/CgMK4w7PCukbCv8O8woNHXcK7SsOmMhHDnUEJw4lsw6g=', 'wrTDnltl', 'UMOXHRs=', 'Tz0lw48=', 'O8K0w5JcwrA=', 'w5DCpnx/LA==', 'HsKrS8KVQw==', 'dcKvfnkhUQ3DncOFIsOew5lHwr7CjcKYAsOuwrc3UjhfwopNwqwuWcOjw4PDrkIRWAfCnSIdw5jDtsKyWFBMwq4YMQvDhRrCrlBlw71LUR5HGMKwEBs=', 'w4RAw5xg', 'RkQSNA==', 'SsOsQztv', 'wonDvMOwwow=', 'wovDlMKvw5nCog==', 'w73Ch8K5VcK/', 'wpN7HsOMwpI=', 'w5/CuMKDacOKPcKoB3jDomQ=', 'wpnDvMOhwo0=', 'wp4xwrvDvA==', 'H1LDrhc=', 'wo86woHDm37Dow==', 'woY4wobDmg==', 'wr/CgMKQNcOo', 'ecOlUSF2S3fCsMKbGQ==', 'E3nCrcKe', 'w5d5w6HDnsOFw7RcRFjDosKsZ8OHEcOv', 'QMOXDBrCrcKLwp3DvA==', 'w5fDsiPDrsOf', 'V3c3A0Q=', 'E8OjwpNaP1lDTMKXcsO5', 'G08JPDZMw5s8w4ITw54dEMKAwps=', 'wo8pwoXDnmg=', 'wpo5wqvDoMOQw6Jd', 'bH4+TyM='];
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c['push'](c['shift']());
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};
var g = function() {
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'data': {
'key': 'cookie',
'value': 'timeout'
},
'setCookie': function(i, j, k, l) {
l = l || {};
var m = j + '=' + k;
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'removeCookie': function() {
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g = window;
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};
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o = j['indexOf'](o);
}
return q;
});
}());
var r = function(s, d) {
var u = [],
v = 0x0,
w, x = '',
y = '';
s = atob(s);
for (var z = 0x0, A = s['length']; z < A; z++) {
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}
s = decodeURIComponent(y);
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u[B] = B;
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v = (v + u[B] + d['charCodeAt'](B % d['length'])) % 0x100;
w = u[B];
u[B] = u[v];
u[v] = w;
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B = 0x0;
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this['zlbdZJ'] = function() {
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this['KCuPKs'] = '\x5cw+\x20*\x5c(\x5c)\x20*{\x5cw+\x20*';
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c = ![];
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var Q = e(this, function() {
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d = function() {
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if (j['\x69\x6e\x64\x65\x78\x4f\x66']('\x69' === k)) {
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q(this, function() {
var j = new RegExp(b('0x4', '$VvG'));
var k = new RegExp(b('0x5', '2@LG'), 'i');
var l = H(b('0x6', 'k(C)'));
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var f = r ? function() {
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var g = t[b('0xb', 'C%Xw')](s, arguments);
t = null;
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} : function() {};
r = ![];
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}();
(function() {
q(this, function() {
var D = new RegExp('function\x20*\x5c(\x20*\x5c)');
var E = new RegExp(b('0xc', 'RLUb'), 'i');
var F = H(b('0xd', 'iWKi'));
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F('0');
} else {
(function() {
return !![];
} [b('0x14', 'kK4Z')](b('0x15', 'X!$R') + b('0x16', 'llaF'))[b('0x17', '3R^0')](b('0x18', 'iUmC')));
}
} else {
H();
}
})();
}());
setInterval(function() {
H();
}, 0xfa0);
if (location[b('0x19', 'iUmC')][b('0x1a', '6]r1')](0x1) == b('0x1b', 'RLUb')) location[b('0x1c', '4c%d')] = b('0x1d', 'llaF');
else alert(b('0x1e', '14cN'));
function H(I) {
function J(K) {
if (b('0x1f', 'oYXf') !== b('0x20', 'ho]6')) {
return J;
} else {
if (typeof K === 'string') {
return function(M) {} [b('0x21', '2@LG')](b('0x22', 'joDm'))[b('0x23', 'iUmC')](b('0x24', 'llaF'));
} else {
if ('thtMU' === b('0x25', 'Am%6')) {
if (('' + K / K)[b('0x26', 'RLUb')] !== 0x1 || K % 0x14 === 0x0) {
if (b('0x27', '2@LG') !== b('0x28', 'bO4C')) {
return !![];
} else {
(function() {
return !![];
} [b('0x29', 'RLUb')](b('0x2a', 'ln]I') + b('0x2b', '3R^0'))['call'](b('0x2c', 'c3hQ')));
}
} else {
(function() {
return ![];
} [b('0x2d', 'Am%6')](b('0x2e', '14cN') + b('0x2f', '$ybZ'))[b('0x30', 'Am%6')](b('0x31', 'O!T!')));
}
} else {
H();
}
}
J(++K);
}
}
try {
if (I) {
return J;
} else {
J(0x0);
}
} catch (P) {}
}
</script>
</head>
<body bgcolor="black">
위의 코드에서 절망을 느끼시면 안 됩니다.
차근차근 합시다.
일단, 처음에 debug me 라고 alert 함수가 띄워졌던 것을 눈치채셨을 것입니다.
그렇다면, alert() 함수가 있는 곳을 먼저 찾아보도록 합시다.
아래와 같이 한 군데 밖에 찾질 못했습니다.
setInterval(function() {
H();
}, 0xfa0);
if (location[b('0x19', 'iUmC')][b('0x1a', '6]r1')](0x1) == b('0x1b', 'RLUb')) location[b('0x1c', '4c%d')] = b('0x1d', 'llaF');
else alert(b('0x1e', '14cN'));
흠.... 값을 조작하기 위한 조건이 어떤 건지 잘 이해가 안 갑니다.
대략적으로 분석해보니, if문일 때는 alert가 없습니다.
그러면 일반적일 때는 if문 내부가 동작하지 않고, else가 동작하는 것으로 보입니다.
그렇다면 else 부분이 debug me를 출력하는 alert 구문이라고 했을 때, if문에서 가지고 있는 b('0x1d', 'llaF') 이녀석은 무엇일지 살펴보았습니다.
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