Deobfuscate меня полностью

Discussion in 'Задания/Квесты/CTF/Конкурсы' started by crlf, 11 Aug 2019.

  1. crlf

    crlf Members of Antichat

    Joined:
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    Что-то скучно в разделе, похоже все ковыряют ctf.antichat.com :cool: Предлагаю небольшой таск на поразмять серое вещество и чуть-чуть попрогать :)
    Цель - написать универсальный деобфускатор для PHP файлов некой CMS. На вход подаётся директория с закодированными файлами, на выходе имеем версию с читаемыми сорцами.
    Вашу реализацию декодера, на любом ЯП, присылайте в ЛС. Предварительно отписав в этой теме, что вы решили таск. Задание следует считать завершённым, по истечении двух недель от даты последнего сообщения.

    global.php
    PHP:
    <?php
    /***************************************************************************
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    [email protected][[!_UGFzc3dvcmQgaW52YWxpZCcpOyB9IGlmICgkYWRtaW4pIHsgaWY
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    ****************************************************************************
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    ***************************************************************************/
    eval(base64_decode("
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    ));
    /**************************************************************************/

    assets.php
    PHP:
    <?php
    /***************************************************************************
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    ****************************************************************************
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    ***************************************************************************/
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    "
    ));
    /**************************************************************************/

    ChatService_Action.php
    PHP:
    <?php
    /***************************************************************************
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    mFkZENvbnRlbnQo?_?[<[email protected]]?:]Q==#
    ****************************************************************************
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAFkGXVtXUQFUBwMADAoHAwIN
    XVcCAwoBD1NQBVZQUgZTVVRTVlEBVVIEDFJRAFQJBAZZWAcFUQdVU1EHDAIDAgAHDQVUUghXAAgD
    BANWW1INB1wC
    ***************************************************************************/
    eval(base64_decode("
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    cm9yX3JlcG9ydGluZygkX19bMV0pOyBldmFsKCd1bnNldCgkX18pOz8+Jy4kX19bMTldKTs=
    "
    ));
    /**************************************************************************/

    [​IMG]

    UPD:
    • Одному из разминающихся, потребовался дополнительный набор файлов. Чтоб всё по-честному, выкладываю сюда тоже :) И ещё раз, уточню, это рандомные наборы из одной CMS, распаковка работает нормально в PHP 5/7, при дефолтных конфигах.
    • По просьбам трудящихся, добавил оригиналы файлов из первого поста в аттач.
      Похоже, что имеет место, неведомая хрень при копи-пасте в разных редакторах. Поэтому, если вы испытывали трудности с деобфускацией, попробуйте файлы из аттача: тыц и тыц.

    Решили:


    @Shubka75

    .
     

    Attached Files:

    #1 crlf, 11 Aug 2019
    Last edited: 12 Aug 2019
    man474019, Shubka75, Spinus and 3 others like this.
  2. Shubka75

    Shubka75 Member

    Joined:
    24 Sep 2015
    Messages:
    54
    Likes Received:
    37
    Reputations:
    18
    Спасибо за таск! Прошел.
     
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